AstroRTC: Research Treasure Chest

[AVAO]

This is a pre-news channel for discussing scientific papers that have recently been published on Arxiv or ResearchGate on astronomical topics.

To see the latest posts in reverse order, press this link!

[AVAO]

Discovery of a one-sided radio filament of PSR J0538+2817 in S147: escape of relativistic PWN leptons into surrounding supernova remnant?
I.I. Khabibullin,1,2,3 E.M. Churazov,2,3 A.M. Bykov,4 N.N. Chugai,5 and I.I. Zinchenko 6
ARXIV | Preprint 2023 Nov 10

Composite of H𝛼 (IGAPS, cyan) and radio emission at 1.4 GHz (NVSS, red) ...All image rights belong to the authors of the paper

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ABSTRACT

We report the discovery of a faint radio filament near PSR J0538+2817 in the NVSS, CGPS, and the Rapid ASKAP Continuum Survey data. This pulsar is plausibly associated with the supernova that gave rise to the Spaghetti Nebula (Simeis 147). The structure is one-sided and appears to be almost aligned (within 17 degrees) with the direction of the pulsar’s proper motion, but in contrast to the known cases of pulsar radio tails, it is located ahead of the pulsar. At the same time, this direction is also approximately (within 5 degrees) perpendicular to the axis of the extended non-thermal X-ray emission around the pulsar. No X-ray or optical emission is detected from the filament region, although the end point of the radio filament appears to be adjacent to a filament of H𝛼 emission. We speculate that this structure might represent a filament connecting pulsar wind nebula with the ambient interstellar medium filled with relativistic electrons escaping the pulsar nebula, i.e. a radio analogue of X-ray filaments of Guitar and Lighthouse PWNs and filaments of non-thermal radio emission in the Galactic Center. ..more...

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RTC4Y Jac

[AVAO]

Discovery of a one-sided radio filament of PSR J0538+2817 in S147: escape of relativistic PWN leptons into surrounding supernova remnant?
I.I. Khabibullin,1,2,3 E.M. Churazov,2,3 A.M. Bykov,4 N.N. Chugai,5 and I.I. Zinchenko 6
ARXIV | Preprint 2023 Nov 10

Composite of H𝛼 (IGAPS, cyan) and radio emission at 1.4 GHz (NVSS, red) ...All image rights belong to the authors of the paper

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ABSTRACT

We report the discovery of a faint radio filament near PSR J0538+2817 in the NVSS, CGPS, and the Rapid ASKAP Continuum Survey data. This pulsar is plausibly associated with the supernova that gave rise to the Spaghetti Nebula (Simeis 147). The structure is one-sided and appears to be almost aligned (within 17 degrees) with the direction of the pulsar’s proper motion, but in contrast to the known cases of pulsar radio tails, it is located ahead of the pulsar. At the same time, this direction is also approximately (within 5 degrees) perpendicular to the axis of the extended non-thermal X-ray emission around the pulsar. No X-ray or optical emission is detected from the filament region, although the end point of the radio filament appears to be adjacent to a filament of H𝛼 emission. We speculate that this structure might represent a filament connecting pulsar wind nebula with the ambient interstellar medium filled with relativistic electrons escaping the pulsar nebula, i.e. a radio analogue of X-ray filaments of Guitar and Lighthouse PWNs and filaments of non-thermal radio emission in the Galactic Center. ..more...

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Interesting that the pulsar is not visible in the optical wavelength.

Click to view full size image

Click to view full size image 1 or image 2

Click to view full size image 1 or image 2

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[AVAO]

JWST imaging of edge-on protoplanetary disks II. Appearance of edge-on disks with a tilted inner region: case study of IRAS04302+2247
Marion Villenave,1 Karl R. Stapelfeldt,1 Gaspard Duchene,2, 3 Francois Menard,3 Schuyler G. Wolff,4 Marshall D. Perrin,5 Christophe Pinte,6, 3 Ryo Tazaki,3 and Deborah L. Padgett
ARXIV | Preprint 2023 Nov 15

Image gallery of the JWST observations of
IRAS04302. All images are shown with a log stretch....
All image rights belong to the authors of the paper
https://media.arxiv-vanity.com/render-o ... 206/x1.png

ABSTRACT

We present JWST imaging from 2 μm to 21 μm of the edge-on protoplanetary disk around the embedded young star IRAS04302+2247. The structure of the source shows two reflection nebulae separated by a dark lane. The source extent is dominated by the extended filamentary envelope at ∼4.4μm and shorter wavelengths, transitioning at 7μm and longer wavelengths to more compact lobes of scattered light from the disk itself. The dark lane thickness does not vary significantly with wavelength, which we interpret as an indication for intermediate-sized (∼10μm) grains in the upper layers of the disk. Intriguingly, we find that the brightest nebula of IRAS40302 switches side between 12.8 μm and 21 μm. We explore the effect of a tilted inner region on the general appearance of edge-on disks. We find that radiative transfer models of a disk including a tilted inner region can reproduce an inversion in the brightest nebula. In addition, for specific orientations, the model also predicts strong lateral asymmetries, which can occur for more than half possible viewing azimuths. A large number of edge-on protoplanetary disks observed in scattered light show such lateral asymmetries (15/20), which suggests that a large fraction of protoplanetary disks might host a tilted inner region. Stellar spots may also induce lateral asymmetries, which are expected to vary over a significantly shorter timescale. Variability studies of edge-on disks would allow to test the dominant scenario for the origin of these asymmetries.
[/b] ..more...

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RTC4Y Jac

[AVAO]

JWST imaging of edge-on protoplanetary disks II. Appearance of edge-on disks with a tilted inner region: case study of IRAS04302+2247
Marion Villenave,1 Karl R. Stapelfeldt,1 Gaspard Duchene,2, 3 Francois Menard,3 Schuyler G. Wolff,4 Marshall D. Perrin,5 Christophe Pinte,6, 3 Ryo Tazaki,3 and Deborah L. Padgett
ARXIV | Preprint 2023 Nov 15

Image gallery of the JWST observations of
IRAS04302. All images are shown with a log stretch....
All image rights belong to the authors of the paper

Click to view full size image

[AVAO]

JWST imaging of edge-on protoplanetary disks II. Appearance of edge-on disks with a tilted inner region: case study of IRAS04302+2247
Marion Villenave,1 Karl R. Stapelfeldt,1 Gaspard Duchene,2, 3 Francois Menard,3 Schuyler G. Wolff,4 Marshall D. Perrin,5 Christophe Pinte,6, 3 Ryo Tazaki,3 and Deborah L. Padgett
ARXIV | Preprint 2023 Nov 15

Interesting environment. IRAS04302+2247 is located near HP Tau...

Click to view full size image

Artistic image composit HST/JWST[/url]


Position of IRAS 04302+2247 at the top right in the middle of the white circle:

Click to view full size image

biggg...Artistic image composit with infill see below[/url]

Click to view full size image

Credit: KPNO/NOIRLab/NSF/AURA/T.A. Image processing: T.A. Rector, M. Zamani & D. de Martin


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[AVAO]

Near-Infrared Observations of Outflows and YSOs in the Massive Star-Forming Region AFGL 5180
S. Crowe, R. Fedriani, J. C. Tan, M. Whittle, Y. Zhang, A. Caratti o Garatti, J.P. Farias, A. Gautam, Z. Telkamp, B. Rothberg, M. Grudic, M. Andersen, G. Cosentino, R. Garcia-Lopez, V. Rosero, K. Tanaka, E. Pinna, F. Rossi, D. Miller, G. Agapito, C. Plantet, E. Ghose, J. Christou, J. Power, A. Puglisi, R. Briguglio, G. Brusa, G. Taylor, X. Zhang, T. Mazzoni, M. Bonaglia, S. Esposito, C. Veillet
ARXIV | Preprint 2023 Nov 20

RGB image of the LUCI-1 SOUL Adaptive Optics data. H2 emission is shown in red, K-band in green, and Brγ in blue...All image rights belong to the authors of the paper

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ABSTRACT

Massive stars play important roles throughout the universe, however their formation remains poorly understood. Observations of jets and outflows in high-mass star-forming regions, as well as surveys of young stellar object (YSO) content, can help test theoretical models of massive star formation.

Aims We aim at characterizing the massive star-forming region AFGL 5180 in the near-infrared (NIR), identifying outflows and relating these to sub-mm/mm sources, as well as surveying the overall YSO surface number density to compare to massive star formation models.
Results At least 40 jet knots were identified via NIR emission from H2 and [FeII] tracing shocked gas. Bright jet knots outflowing from the central most massive protostar, S4 (estimated mass ∼11M⊙, via SED fitting), are detected towards the east of the source and are resolved in fine detail with the AO imaging. Additional knots are distributed throughout the field, likely indicating the presence of multiple driving sources.
Conclusions This study demonstrates the utility of high-resolution NIR imaging, in particular with AO, for detecting outflow activity and YSOs in distant regions. The presented images reveal the complex morphology of outflow-shocked gas within the large-scale bipolar flow of a massive protostar, as well as clear evidence for several other outflow driving sources in the region. Finally, this work presents a novel approach to compare the observed YSO surface number density from our study against different models of massive star formation...more...

...Scientific presentation...

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RTC4Y Jac

[AVAO]

Near-Infrared Observations of Outflows and YSOs in the Massive Star-Forming Region AFGL 5180
S. Crowe, R. Fedriani, J. C. Tan, M. Whittle, Y. Zhang, A. Caratti o Garatti, J.P. Farias, A. Gautam, Z. Telkamp, B. Rothberg, M. Grudic, M. Andersen, G. Cosentino, R. Garcia-Lopez, V. Rosero, K. Tanaka, E. Pinna, F. Rossi, D. Miller, G. Agapito, C. Plantet, E. Ghose, J. Christou, J. Power, A. Puglisi, R. Briguglio, G. Brusa, G. Taylor, X. Zhang, T. Mazzoni, M. Bonaglia, S. Esposito, C. Veillet
ARXIV | Preprint 2023 Nov 20

Click to view full size image 1 or image 2

HERSCHEL/ALLWISEcolor/HSTinfill Original Data:NASA/ESA

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images & infill(All image rights belong to the authors of the paper)

[AVAO]

High-Resolution, Mid-Infrared Color Temperature Mapping of the Central 10 Arcseconds of the
Galaxy
Cuc K. Dinh, Anna Cuirlo, Mark R. Morris, Rainer Schödel, Andrea Ghez, Tuan Do
ARXIV | Preprint 2023 Nov 29

The inner parsec region of the Galactic Center as observed with the PAH1 band (8.6 μm) of the VISIR imager at the VLT. ...All image rights belong to the authors of the paper

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ABSTRACT

The neighborhood of the Galactic black hole boasts a plethora of extended interstellar gas and dust features as well as populations of compact (unresolved, or marginally resolved) features such as the G objects. Most are well manifested in the infrared. To disentangle and characterize the infrared structure of extended features and identify compact sources, we used 3.8~μm (L' filter) data from the NIRC2 imager at the Keck Observatory and 8.6~μm (PAH1 filter) data from the VISIR imager at the Very Large Telescope (VLT) to produce the highest-resolution mid-IR color-temperature map of the inner half-parsec of the Galactic Center to date. From this map, we compile a catalog of features that stand out from their background. In particular, we identify 33 compact sources that stand out against the local background temperature, 11 of which are newly identified ...

[/b] ..more...

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RTC4Y Jac

[Ann]

High-Resolution, Mid-Infrared Color Temperature Mapping of the Central 10 Arcseconds of the
Galaxy
Cuc K. Dinh, Anna Cuirlo, Mark R. Morris, Rainer Schödel, Andrea Ghez, Tuan Do
ARXIV | Preprint 2023 Nov 29

The inner parsec region of the Galactic Center as observed with the PAH1 band (8.6 μm) of the VISIR imager at the VLT. ...All image rights belong to the authors of the paper

---

ABSTRACT

The neighborhood of the Galactic black hole boasts a plethora of extended interstellar gas and dust features as well as populations of compact (unresolved, or marginally resolved) features such as the G objects. Most are well manifested in the infrared. To disentangle and characterize the infrared structure of extended features and identify compact sources, we used 3.8~μm (L' filter) data from the NIRC2 imager at the Keck Observatory and 8.6~μm (PAH1 filter) data from the VISIR imager at the Very Large Telescope (VLT) to produce the highest-resolution mid-IR color-temperature map of the inner half-parsec of the Galactic Center to date. From this map, we compile a catalog of features that stand out from their background. In particular, we identify 33 compact sources that stand out against the local background temperature, 11 of which are newly identified ...

[/b] ..more...

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RTC4Y Jac

Fascinating, Jac!

This is my favorite picture of the center of the Milky Way:

Hubble-Spitzer Color Mosaic of the Galactic Center

The white vortex (at lower right) is surrounding SgrA*, as far as I can understand. Note the "flow" of little white dots, likely massive stars that are scattered fairly evenly in the innermost part of the galaxy. At lower left you can see the Quintuplet Cluster with the massive Pistol Star, surrounded by a thick white nebula, whose angular appearance resembles half a picture frame, or possibly a pistol. At upper left you can see the smaller Arches Cluster. You can see the "arches" above and to the right of the Arches Cluster. To the upper left of the white vortex, there may be a large supernova remnant.

I read a bit of the arXiv paper that you linked to, but I always have the Hubble-Spitzer image in my mind. Also, I keep thinking of other galaxies that display massive star formation near their cores, such as M95:

M95. Note the star formation very close to the core. Credit: ESA/Hubble.

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Of course, the paper you linked to talked about the central parsec of the Milky Way, and the star formation seen near the center of M95 is probably a lot more than a parsec away from the central black hole of that galaxy.

Still, very interesting! Thanks, Jac!

Ann

[Ann]

Near-Infrared Observations of Outflows and YSOs in the Massive Star-Forming Region AFGL 5180
S. Crowe, R. Fedriani, J. C. Tan, M. Whittle, Y. Zhang, A. Caratti o Garatti, J.P. Farias, A. Gautam, Z. Telkamp, B. Rothberg, M. Grudic, M. Andersen, G. Cosentino, R. Garcia-Lopez, V. Rosero, K. Tanaka, E. Pinna, F. Rossi, D. Miller, G. Agapito, C. Plantet, E. Ghose, J. Christou, J. Power, A. Puglisi, R. Briguglio, G. Brusa, G. Taylor, X. Zhang, T. Mazzoni, M. Bonaglia, S. Esposito, C. Veillet
ARXIV | Preprint 2023 Nov 20

Click to view full size image 1 or image 2

HERSCHEL/ALLWISEcolor/HSTinfill Original Data:NASA/ESA

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images & infill(All image rights belong to the authors of the paper)

Fascinating, Jac!

This stuff is too technical for me, but I'm very interested in finding out where this region of star formation is located.

S. Crowe et al. wrote:

Here we present NIR observations of the massive starforming region AFGL 5180, also known as IRAS 06058+2138 or G188.949+0.915 (peak pixel in our near-infrared image: RA(J2000)=06:08:53.38, Dec(J2000)=+21:38:28.38;

I filled in those coordinates in my software program and came to a location in Gemini, very close to nebula Sharpless 247.

Sharpless 247 and possibly AFGL 5180 (tiny orange spot to the left of the red nebula?). Credit: Dan Crowson

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Ann

[AVAO]

Near-Infrared Observations of Outflows and YSOs in the Massive Star-Forming Region AFGL 5180
S. Crowe, R. Fedriani, J. C. Tan, M. Whittle, Y. Zhang, A. Caratti o Garatti, J.P. Farias, A. Gautam, Z. Telkamp, B. Rothberg, M. Grudic, M. Andersen, G. Cosentino, R. Garcia-Lopez, V. Rosero, K. Tanaka, E. Pinna, F. Rossi, D. Miller, G. Agapito, C. Plantet, E. Ghose, J. Christou, J. Power, A. Puglisi, R. Briguglio, G. Brusa, G. Taylor, X. Zhang, T. Mazzoni, M. Bonaglia, S. Esposito, C. Veillet
ARXIV | Preprint 2023 Nov 20

Click to view full size image 1 or image 2

HERSCHEL/ALLWISEcolor/HSTinfill Original Data:NASA/ESA

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images

Click to view full size image

Source: NASA/ESA (HST) Hubble Outreach Images & infill(All image rights belong to the authors of the paper)

Fascinating, Jac!

This stuff is too technical for me, but I'm very interested in finding out where this region of star formation is located.

S. Crowe et al. wrote:

Here we present NIR observations of the massive starforming region AFGL 5180, also known as IRAS 06058+2138 or G188.949+0.915 (peak pixel in our near-infrared image: RA(J2000)=06:08:53.38, Dec(J2000)=+21:38:28.38;

I filled in those coordinates in my software program and came to a location in Gemini, very close to nebula Sharpless 247.

Sharpless 247 and possibly AFGL 5180 (tiny orange spot to the left of the red nebula?). Credit: Dan Crowson

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Ann

That's right. AFGL 5180 is on the edge of Sh 2-247.

Click to view full size image

artistic composit / jac berne (flickr)

[Ann]

There are several massive and very distant (~ 5,000 ly) blue OB stars, often giants and supergiants, in northern Orion close to NGC 2174 and in western Gemini relatively close to M35: there is the central star of NGC 2174 itself, HD 42088, as well as chi2 Orionis, PU Geminorum, PX Geminorum, HD 42379, HD 41690, HD 42400 and possibly others. Indeed, the star ionizing Sharpless 247 is an O9.5IV star at the same distance. This certainly seems to be a quite fertile region for star formation. (M35 appears to be unrelated to the other stars I have mentioned.)

Ann

[AVAO]

High-Resolution, Mid-Infrared Color Temperature Mapping of the Central 10 Arcseconds of the
Galaxy
Cuc K. Dinh, Anna Cuirlo, Mark R. Morris, Rainer Schödel, Andrea Ghez, Tuan Do
ARXIV | Preprint 2023 Nov 29

The inner parsec region of the Galactic Center as observed with the PAH1 band (8.6 μm) of the VISIR imager at the VLT. ...All image rights belong to the authors of the paper

---

ABSTRACT

The neighborhood of the Galactic black hole boasts a plethora of extended interstellar gas and dust features as well as populations of compact (unresolved, or marginally resolved) features such as the G objects. Most are well manifested in the infrared. To disentangle and characterize the infrared structure of extended features and identify compact sources, we used 3.8~μm (L' filter) data from the NIRC2 imager at the Keck Observatory and 8.6~μm (PAH1 filter) data from the VISIR imager at the Very Large Telescope (VLT) to produce the highest-resolution mid-IR color-temperature map of the inner half-parsec of the Galactic Center to date. From this map, we compile a catalog of features that stand out from their background. In particular, we identify 33 compact sources that stand out against the local background temperature, 11 of which are newly identified ...

[/b] ..more...

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RTC4Y Jac

Fascinating, Jac!

This is my favorite picture of the center of the Milky Way:

STScI-01EVT5Y35KFV7KFJ7ERSGDNV40[1].jpg

Hubble-Spitzer Color Mosaic of the Galactic Center

The white vortex (at lower right) is surrounding SgrA*, as far as I can understand. Note the "flow" of little white dots, likely massive stars that are scattered fairly evenly in the innermost part of the galaxy. At lower left you can see the Quintuplet Cluster with the massive Pistol Star, surrounded by a thick white nebula, whose angular appearance resembles half a picture frame, or possibly a pistol. At upper left you can see the smaller Arches Cluster. You can see the "arches" above and to the right of the Arches Cluster. To the upper left of the white vortex, there may be a large supernova remnant.

I read a bit of the arXiv paper that you linked to, but I always have the Hubble-Spitzer image in my mind. Also, I keep thinking of other galaxies that display massive star formation near their cores, such as M95:

M95. Note the star formation very close to the core. Credit: ESA/Hubble.

---

Of course, the paper you linked to talked about the central parsec of the Milky Way, and the star formation seen near the center of M95 is probably a lot more than a parsec away from the central black hole of that galaxy.

Still, very interesting! Thanks, Jac!

Ann

ThanX Ann - Your contextualization is fascinating as always!


Location of the area examined in the paper:

Click to view full size image 1 or image 2

Click to view full size image 1 or image 2

jac berne (flickr) Overlay with images from CHANDRA(blue) & HST(IR/red OPT/white) (Infills: All image rights belong to the authors of the paper!

[AVAO]

The SARAO MeerKAT 1.3 GHz Galactic Plane Survey
S. Goedhart, et. al.
ARXIV | Preprint 2023 Dez 13

An example Moment 0 mosaic from SMGPS Data Release 1. The image is a combination of SMGPS 1.3 GHz (white, blue and cyan, which encode bright, mid-range and low brightnesses respectively) andHerschelHi-GAL 70 𝜇m (yellow) and 250 𝜇m (orange) emission. This colour combination was chosen to differentiate between SNRs and Hii regions; the former appear mostly cyan whereas the latter appear with white cores surrounded by yellow/orange emission. ...All image rights belong to the authors of the paper

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ABSTRACT

We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane (...). SMGPS is the largest, most sensitive and highest angular resolution 1 GHz survey of the Plane yet carried out, with an angular resolution of 8" and a broadband RMS sensitivity of ∼10--20 μ Jy/beam. Here we describe the first publicly available data release from SMGPS which comprises data cubes of frequency-resolved images over 908--1656 MHz, ...Finally, we discuss the tremendous potential of SMGPS by showcasing highlights of the Galactic and extragalactic science that it permits. These highlights include the discovery of a new population of non-thermal radio filaments; identification of new candidate supernova remnants, pulsar wind nebulae and planetary nebulae; improved radio/mid-IR classification of rare Luminous Blue Variables and discovery of associated extended radio nebulae; new radio stars identified by Bayesian cross-matching techniques; the realisation that many of the largest radio-quiet WISE HII region candidates are not true HII regions; and a large sample of previously undiscovered background HI galaxies in the Zone of Avoidance. [/b] ..more...

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RTC4Y Jac

[AVAO]

3C 273 Host Galaxy with Hubble Space Telescope Coronagraphy
Bin B. Ren, Kevin Fogarty, John H. Debes, Eileen T. Meyer, Youbin Mo, Dimitri Mawet, Marshall D. Perrin, Patrick M. Ogle, Johannes Sahlmann
ARXIV | Preprint 2024 Feb 24

3C 273 host galaxy and surroundings in visible light seen with the HST/STIS coronagraph. The surface brightness is in log scale....All image rights belong to the authors of the paper

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ABSTRACT
The close-in regions of bright quasars' host galaxies have been difficult to image due to the overwhelming light from the quasars. With coronagraphic observations in visible light using the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, we removed 3C 273 quasar light using color-matching reference stars. The observations revealed the host galaxy from 60" to 0.2" with nearly full angular coverage. Isophote modeling revealed a new core jet, a core blob, and multiple smaller-scale blobs within 2.5". The blobs could potentially be satellite galaxies or infalling materials towards the central quasar. Using archival STIS data, we constrained the apparent motion of its large scale jets over a 22 yr timeline. By resolving the 3C 273 host galaxy with STIS, our study validates the coronagraph usage on extragalactic sources in obtaining new insights into the central ~kpc regions of quasar hosts. [/b] ..more...

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RTC4Y Jac

[Christian G.]

3C 273 Host Galaxy with Hubble Space Telescope Coronagraphy
Bin B. Ren, Kevin Fogarty, John H. Debes, Eileen T. Meyer, Youbin Mo, Dimitri Mawet, Marshall D. Perrin, Patrick M. Ogle, Johannes Sahlmann
ARXIV | Preprint 2024 Feb 24

3C 273 host galaxy and surroundings in visible light seen with the HST/STIS coronagraph. The surface brightness is in log scale....All image rights belong to the authors of the paper

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ABSTRACT
The close-in regions of bright quasars' host galaxies have been difficult to image due to the overwhelming light from the quasars. With coronagraphic observations in visible light using the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, we removed 3C 273 quasar light using color-matching reference stars. The observations revealed the host galaxy from 60" to 0.2" with nearly full angular coverage. Isophote modeling revealed a new core jet, a core blob, and multiple smaller-scale blobs within 2.5". The blobs could potentially be satellite galaxies or infalling materials towards the central quasar. Using archival STIS data, we constrained the apparent motion of its large scale jets over a 22 yr timeline. By resolving the 3C 273 host galaxy with STIS, our study validates the coronagraph usage on extragalactic sources in obtaining new insights into the central ~kpc regions of quasar hosts. [/b] ..more...

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RTC4Y Jac

An utterly spectacular object! 4 trillion times more luminous than the Sun, shines like a thousand galaxies, a temperature of 10 trillion Kelvin while the theoretical limit was supposedly 100 billion K, and this brightest of bright objects is powered by the darkest of dark objects! Beyond anything imagined even in science fiction.
I'm adding this other image of 3C 273 here, I find it gives a sense of how incommensurably brighter than its surrounding the quasar is:

p.s. I understand that the paper is about studying what the quasar's light hides whereas my comment is solely about the quasar's blinding light itself! Sorry about that AVAO, I couldn't help myself!

[AVAO]

3C 273 Host Galaxy with Hubble Space Telescope Coronagraphy
Bin B. Ren, Kevin Fogarty, John H. Debes, Eileen T. Meyer, Youbin Mo, Dimitri Mawet, Marshall D. Perrin, Patrick M. Ogle, Johannes Sahlmann
ARXIV | Preprint 2024 Feb 24

3C 273 host galaxy and surroundings in visible light seen with the HST/STIS coronagraph. The surface brightness is in log scale....All image rights belong to the authors of the paper

---

ABSTRACT
The close-in regions of bright quasars' host galaxies have been difficult to image due to the overwhelming light from the quasars. With coronagraphic observations in visible light using the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, we removed 3C 273 quasar light using color-matching reference stars. The observations revealed the host galaxy from 60" to 0.2" with nearly full angular coverage. Isophote modeling revealed a new core jet, a core blob, and multiple smaller-scale blobs within 2.5". The blobs could potentially be satellite galaxies or infalling materials towards the central quasar. Using archival STIS data, we constrained the apparent motion of its large scale jets over a 22 yr timeline. By resolving the 3C 273 host galaxy with STIS, our study validates the coronagraph usage on extragalactic sources in obtaining new insights into the central ~kpc regions of quasar hosts. [/b] ..more...

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RTC4Y Jac

An utterly spectacular object! 4 trillion times more luminous than the Sun, shines like a thousand galaxies, a temperature of 10 trillion Kelvin while the theoretical limit was supposedly 100 billion K, and this brightest of bright objects is powered by the darkest of dark objects! Beyond anything imagined even in science fiction.
I'm adding this other image of 3C 273 here, I find it gives a sense of how incommensurably brighter than its surrounding the quasar is:
Best_image_of_bright_quasar_3C_273.jpg
p.s. I understand that the paper is about studying what the quasar's light hides whereas my comment is solely about the quasar's blinding light itself! Sorry about that AVAO, I couldn't help myself!

ThanX for the exciting input Christian.

I am also deeply impressed by the huge amount of concentrated energy that radiates throughout the universe from this place.

Click to view full size image

3C 273 X-ray jac berne (flickr)

What still fascinates me is the fact that three X-ray & Radio galaxies are pointing their jets towards the sky in the same area of the sky.

​Jac

Click to view full size image

Origianl Data: NASA/ESA Radio: Planck LFI 030 GHz jac berne (flickr)

Click to view full size image

Origianl Data: NASA/ESA jac berne (flickr)

[Christian G.]

3C 273 Host Galaxy with Hubble Space Telescope Coronagraphy
Bin B. Ren, Kevin Fogarty, John H. Debes, Eileen T. Meyer, Youbin Mo, Dimitri Mawet, Marshall D. Perrin, Patrick M. Ogle, Johannes Sahlmann
ARXIV | Preprint 2024 Feb 24



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RTC4Y Jac

An utterly spectacular object! 4 trillion times more luminous than the Sun, shines like a thousand galaxies, a temperature of 10 trillion Kelvin while the theoretical limit was supposedly 100 billion K, and this brightest of bright objects is powered by the darkest of dark objects! Beyond anything imagined even in science fiction.
I'm adding this other image of 3C 273 here, I find it gives a sense of how incommensurably brighter than its surrounding the quasar is:
Best_image_of_bright_quasar_3C_273.jpg
p.s. I understand that the paper is about studying what the quasar's light hides whereas my comment is solely about the quasar's blinding light itself! Sorry about that AVAO, I couldn't help myself!

ThanX for the exciting input Christian.

I am also deeply impressed by the huge amount of concentrated energy that radiates throughout the universe from this place.

Click to view full size image

3C 273 X-ray jac berne (flickr)

What still fascinates me is the fact that three X-ray & Radio galaxies are pointing their jets towards the sky in the same area of the sky.

​Jac

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Origianl Data: NASA/ESA Radio: Planck LFI 030 GHz jac berne (flickr)

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Origianl Data: NASA/ESA jac berne (flickr)

Thanks for shining even more light on the matter! (no pun intended)
Seriously fascinating...

[AVAO]

MeerKAT: discovery of 10 strange and exotic pulsar in globular cluster Terzan 5
P.V. Padmanabh, S.M. Ransom, P.C.C. Freire, A. Ridolfi, J.D. Taylor, C. Choza, C.J. Clark, F. Abbate, M. Bailes, E.D. Barr, S. Buchner, M. Burgay, M.E. DeCesar, W. Chen, A. Corongiu, D.J. Champion, A. Dutta, M. Geyer, J.W.T. Hessels, M. Kramer, A. Possenti, I.H. Stairs, B.W. Stappers, V. Venkatraman Krishnan, L. Vleeschower, L. Zhang
ARXIV | Preprint 2024 June 19

Integrated pulse profiles of all the newly discovered pulsars in Terzan 5. These plots are obtained after summing together individual profiles from different epochs and aligning the profiles with respect to a reference template profile. Credit: Padmanabh et al., 2024

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... Many pulsars in Terzan 5 have evolved into bizarre and eccentric forms. Astronomers already knew that 39 pulsars call Terzan 5 home. With the teamwork of the U.S. National Science Foundation Green Bank Telescope (NSF GBT) and the South African Radio Astronomy Observatory's MeerKAT Telescope, 10 more have been added to the count.

Among the discoveries, astronomers saw two likely neutron stars pulled into each other's orbit as a binary system. Out of 3,600 known pulsars in the galaxy, only 20 have been identified as double neutron-star binaries.

When pulsars pair off in binaries, the gravitational pull from one to the other can steal material and energy, causing one to spin even faster, becoming a millisecond pulsar. This pair could be a record breaker, with a new contender for fastest spinning pulsar in a double neutron-star system, and the longest orbit of its kind. The current record holder for fastest spinning pulsar already resides in Terzan 5.

Astronomers also observed three new rare pulsar "spider" binary systems (in addition to five already known in the cluster) called Redbacks or Black Widows, depending on the types of companion stars that they have. A companion star falls into the orbit of a spider pulsar, where a web of plasma fills the space between the two (caused by outflows from the companion star due to the pulsar's energy) slowly dissolving the companion over time.

more: https://phys.org/news/2024-07-telescope ... xotic.html

RTC4Y Jac

...10 new millisecond pulsars see in red...

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[AVAO]

MUSE: Discovery of 307 new and seven oxygen-rich supernova remnants with new method
Paper title: Discovery of young, oxygen-rich supernova remnants in PHANGS-MUSE galaxies
T. Kravtsov, J. P. Anderson, H. Kuncarayakti, K. Maeda and S. Mattila
ARXIV | Preprint 2024 September 11

Image showing some of the detected SNRs presented by a circle, while the oxygen-rich ones are represented by a gold star. Credit: Kravtsov et al., 2024.

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... Using a new method exploiting the capabilities of the Multi Unit Spectroscopic Explorer (MUSE), astronomers have detected 307 new supernova remnants, including seven rare oxygen-rich ones.
[...]
Some supernova remnants showcase strong visible light oxygen emission, and due to that, are known as oxygen-rich SNRs. However, oxygen-rich SNRs are rarely found, as to date, only eight such objects have been identified in our galaxy and in the Magellanic Clouds. Moreover, the nature of these SNRs and their connection to specific supernovae (SNe) is still not well understood.
[...]
Now, a team of astronomers led by Timo Kravtsov of the European Southern Observatory (ESO) in Chile reports new findings that could advance our knowledge about oxygen-rich supernova remnants. By employing a new method of SNR detection, they managed to discover hundreds of new remnants with MUSE mounted on ESO's Very Large Telescope (VLT), including those exhibiting oxygen-emission.
[...]
Summing up the results, the authors of the paper noted that their study further underlined the rarity of oxygen-rich supernova remnants. They plan to expand their new method to other nearby galaxies, hoping to detect more oxygen-rich SNRs, which could shed more light on the origin and properties of these remnants.
[...]

more: https://phys.org/news/2024-09-astronome ... ethod.html
paper on ARXIV: https://arxiv.org/pdf/2409.06504

RTC4Y Jac