Starship Asterisk*

APOD Robot wrote: ↑Thu Jun 27, 2024 4:05 am Protostellar Outflows in Serpens

Explanation: Jets of material blasting from newborn stars, are captured in this James Webb Space Telescope close-up of the Serpens Nebula. The powerful protostellar outflows are bipolar, twin jets spewing in opposite directions. Their directions are perpendicular to accretion disks formed around the spinning, collapsing stellar infants. In the NIRcam image, the reddish color represents emission from molecular hydrogen and carbon monoxide produced as the jets collide with the surrounding gas and dust. The sharp image shows for the first time that individual outflows detected in the Serpens Nebula are generally aligned along the same direction. That result was expected, but has only now come into clear view with Webb's detailed exploration of the active young star-forming region. Brighter foreground stars exhibit Webb's characteristic diffraction spikes. At the Serpens Nebula's estimated distance of 1,300 light-years, this cosmic close-up frame is about 1 light-year across.

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AVAO wrote: ↑Thu Jun 27, 2024 4:50 am

APOD Robot wrote: ↑Thu Jun 27, 2024 4:05 am Protostellar Outflows in Serpens

Explanation: Jets of material blasting from newborn stars, are captured in this James Webb Space Telescope close-up of the Serpens Nebula. The powerful protostellar outflows are bipolar, twin jets spewing in opposite directions. Their directions are perpendicular to accretion disks formed around the spinning, collapsing stellar infants. In the NIRcam image, the reddish color represents emission from molecular hydrogen and carbon monoxide produced as the jets collide with the surrounding gas and dust. The sharp image shows for the first time that individual outflows detected in the Serpens Nebula are generally aligned along the same direction. That result was expected, but has only now come into clear view with Webb's detailed exploration of the active young star-forming region. Brighter foreground stars exhibit Webb's characteristic diffraction spikes. At the Serpens Nebula's estimated distance of 1,300 light-years, this cosmic close-up frame is about 1 light-year across.

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Credit: NASA, ESA, CSA, STScI, K. Pontoppidan (NASA’s Jet Propulsion Laboratory), J. Green (Space Telescope Science Institute)


Great: ZOOM IN: https://esawebb.org/images/weic2415a/zoomable/

vstill wrote: ↑Thu Jun 27, 2024 11:44 am It would have helped to label this image, as I can't tell from the text exactly what I'm looking at—confusing at best.

Figure 1:The central location of each outflow (green arrows) and suggested driving sources (blue stars) indicated on a NIRCam-color image (F140M - blue, F210M - green, F360M - orange, F480M - red). The arrow and source locations are offset from the outflow for clarity - refer to the coordinates in the catalogue for accurate outflow coordinates. This combined image is centered at approximately 18:29:55.8 +01:14:34. Image processing credit: Alyssa Pagan.
The spin axes of very young stars may be efficiently traced by their outflows. Indeed, the emergence of energetic protostellar outflows is a ubiquitous signature of early star formation (Frank et al., 2014). Collimated jets launching from the innermost regions of low-mass young stars impact surrounding molecular cloud material and can create striking structures of shocked ionized, atomic, and molecular gas (Reipurth & Bally, 2001; Bally, 2016). Since the jets are likely accelerated and collimated by a rapidly rotating poloidal magnetic field in the inner star-disk system, they emerge along the stellar rotation axis and thus trace the angular momentum vector of the star itself (Kwan & Tademaru, 1988; Ouyed & Pudritz, 1997; Banerjee & Pudritz, 2006).

Jet material ejected from protostellar systems may contain sufficient momentum to reach distances comparable to the entire cloud, giving rise to spectacular “parsec-scale” outflows (Eisloffel & Mundt, 1997; Reipurth et al., 1997). As some protostellar outflows traverse molecular cloud core scales (
∼
1-2 pc) in less than the cloud life time, they provide an important feedback mechanism that may act to limit the ability of a cloud to form new stars (Hansen et al., 2012; Plunkett et al., 2015). Indeed, molecular clouds are known to form stars at a relatively low conversion efficiency (Evans et al., 2009; Federrath & Klessen, 2012).

Christian G. wrote: ↑Thu Jun 27, 2024 1:08 pm Marvellous image, cosmic creation in full force! And we barely need to "surmise" what's going on, we see those new worlds forming! (even more so in AVAO's zoom-in link)

AVAO wrote: ↑Thu Jun 27, 2024 8:04 pm

Christian G. wrote: ↑Thu Jun 27, 2024 1:08 pm Marvellous image, cosmic creation in full force! And we barely need to "surmise" what's going on, we see those new worlds forming! (even more so in AVAO's zoom-in link)

Here is some context about the environment and the comparison between Optical and IR.
Dynamic area up there ,-)

Click to view full size image 1 or image 2

Click to view full size image

NASA/ESA(JWST/HERSCHEL/WISE/more) jac berne (flickr)

johnnydeep wrote: ↑Thu Jun 27, 2024 6:34 pm Yeah, I'm not clearly seeing any obvious aligned "jests" in this image. Fortunately, there is a nice image at the "detailed explanation" link that provides some help, though the alignments aren't as close as I was expecting. The original image is too big to post, but here's a side-by-side comparison with today's APOD:


Protostellar Outflows in Serpens.jpg

Figure 1:The central location of each outflow (green arrows) and suggested driving sources (blue stars) indicated on a NIRCam-color image (F140M - blue, F210M - green, F360M - orange, F480M - red). The arrow and source locations are offset from the outflow for clarity - refer to the coordinates in the catalogue for accurate outflow coordinates. This combined image is centered at approximately 18:29:55.8 +01:14:34. Image processing credit: Alyssa Pagan.
The spin axes of very young stars may be efficiently traced by their outflows. Indeed, the emergence of energetic protostellar outflows is a ubiquitous signature of early star formation (Frank et al., 2014). Collimated jets launching from the innermost regions of low-mass young stars impact surrounding molecular cloud material and can create striking structures of shocked ionized, atomic, and molecular gas (Reipurth & Bally, 2001; Bally, 2016). Since the jets are likely accelerated and collimated by a rapidly rotating poloidal magnetic field in the inner star-disk system, they emerge along the stellar rotation axis and thus trace the angular momentum vector of the star itself (Kwan & Tademaru, 1988; Ouyed & Pudritz, 1997; Banerjee & Pudritz, 2006).

Jet material ejected from protostellar systems may contain sufficient momentum to reach distances comparable to the entire cloud, giving rise to spectacular “parsec-scale” outflows (Eisloffel & Mundt, 1997; Reipurth et al., 1997). As some protostellar outflows traverse molecular cloud core scales

(

...
∼
1-2 pc) in less than the cloud life time, they provide an important feedback mechanism that may act to limit the ability of a cloud to form new stars (Hansen et al., 2012; Plunkett et al., 2015). Indeed, molecular clouds are known to form stars at a relatively low conversion efficiency (Evans et al., 2009; Federrath & Klessen, 2012).

VictorBorun wrote: ↑Sun Jun 30, 2024 2:27 am disk shadow 1

The disk around the intermediate-mass young star EC 82 casts a large shadow on surrounding reflection nebulosity, giving rise to the so-called “Great Serpens Disk Shadow”

sh1.jpgsh1+.jpg

...

Click to view full size image 1 or image 2

Ann wrote: ↑Thu Jun 27, 2024 7:20 am Why do the white blob and the yellow blob appear to be windblown in opposite directions?
The windblown white blob, by the way, is ever so slightly similar to Hubble's Variable Nebula.

Hubble's Variable Nebula. Credit: HST/NASA/JPL/Judy Schmidt

---

Ann

VictorBorun wrote: ↑Sun Jun 30, 2024 3:12 am

Ann wrote: ↑Thu Jun 27, 2024 7:20 am Why do the white blob and the yellow blob appear to be windblown in opposite directions?
The windblown white blob, by the way, is ever so slightly similar to Hubble's Variable Nebula.

Hubble's Variable Nebula. Credit: HST/NASA/JPL/Judy Schmidt

---

Ann

fitting the Protostellar Jets Map to the Two Questions by Ann

what's this.jpgwhat's this+.jpg

...

Click to view full size image 1 or image 2