Starship Asterisk*

LDN 1471: A Windblown Star Cavity

Explanation: What is the cause of this unusual parabolic structure? This illuminated cavity, known as LDN 1471, was created by a newly forming star, seen as the bright source at the peak of the parabola. This protostar is experiencing a stellar outflow which is then interacting with the surrounding material in the Perseus Molecular Cloud, causing it to brighten. We see only one side of the cavity -- the other side is hidden by dark dust. The parabolic shape is caused by the widening of the stellar-wind blown cavity over time. Two additional structures can also be seen either side of the protostar; these are known as Herbig-Haro objects, again caused by the interaction of the outflow with the surrounding material. What causes the striations on the cavity walls, though, remains unknown. The featured image was taken by NASA and ESA’s Hubble Space Telescope after an original detection by the Spitzer Space Telescope.

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Well, who knew that iconic edge-on galaxy NFC 4565 is located so close to a proto-star in Perseus and can be seen right through the dust accompanying this starbirth?


Oh, and no: NGC 4565 is not located close to LDN 1471 in Perseus. What we are seeing is another galaxy that presents the same striking edge-on perspective as the famous Needle Galaxy. Isn't it interesting, though, that galaxies are seen right through the dusty realms of starbirth, millions of light-years in the background?

I guess it goes to show how thin cosmic dust usually is, and how relatively bright edge-on galaxies tend to be.

Oh, and... this is my post number 13831. Sounds like a lucky number. A nice palindrome.

Ann

APOD Robot wrote: ↑Sun Nov 17, 2024 5:05 am LDN 1471: A Windblown Star Cavity

where we are
NASA/ESA (HST/AllWISE a.m.)
LRLL 54361: https://esahubble.org/images/heic1303a https://commons.wikimedia.org/wiki/File:LRLL_54361.jpg

The striations are truly remarkable given the scale of the image. Filaments seem to be a universal, scale invariant phenomenon in the insterstellar medium ( images of Aquila, Spider and Taurus in [https://www.aanda.org/articles/aa/full ... 9-23.html]).

Alex555

alex555 wrote: ↑Sun Nov 17, 2024 11:17 am The striations are truly remarkable given the scale of the image. Filaments seem to be a universal, scale invariant phenomenon in the insterstellar medium ( images of Aquila, Spider and Taurus in [https://www.aanda.org/articles/aa/full ... 9-23.html]).

Alex555

Sorry corrected link

Alex555

to my eye there's another pillar of creation
...

alex555 wrote: ↑Sun Nov 17, 2024 11:26 am

alex555 wrote: ↑Sun Nov 17, 2024 11:17 am The striations are truly remarkable given the scale of the image. Filaments seem to be a universal, scale invariant phenomenon in the insterstellar medium ( images of Aquila, Spider and Taurus in [https://www.aanda.org/articles/aa/full ... 9-23.html]).

Alex555

Sorry corrected link

Alex555

Very interesting paper, thank you!

(I just don't know whether it would be better to speak of "spaghettification" instead of "noise reduction" )
https://www.aanda.org/articles/aa/full_ ... -fig14.jpg


Tip: You have 24 hours time to edit your post using the pencil-symbol.

When I see images of stars being born like this one, I have a thought which is as simple as it is wondrous (to me), namely that these things just "happen by themselves"! On Earth when water vapor clouds condense, rain drops appear, in space when hydrogen clouds condense, STARS appear! Just like that! How awesome is this?

Geck! Can you drop by a moment, tell us how you’re doing?

The fact that the proto-star is so close to the cusp of the parabola, does that mean it is moving through the interstellar medium at the same speed as its stellar wind?

"The parabolic shape is caused by the widening of the stellar-wind blown cavity over time. "

A proto-star's stellar outflow is more usually bi-polar, with a symmetrical parabolic shape either side of the star's axis. I don't know if this is driven by, or directed by, the star's magnetic field or its rotation. So the outflow of LDN 1471 is unusual only by being uni-polar. The blurb to this APoD says that the star is in the Perseus Molecular Cloud, so is the reason that the cloud and star are moving relative to one another? See: Taikashi, Kido, et al, Formation of unipolar outflow and protostellar rocket effect in magnetized turbulent molecular cloud cores Xiv:2401.02525v1 [astro-ph.SR] 04 Jan 2024

John

In case it's not obvious, as it wasn't to me, the HH objects are shown in the mouse-over at the "featured image" link.

Cousin Ricky wrote: ↑Sun Nov 17, 2024 3:40 pm Geck! Can you drop by a moment, tell us how you’re doing?

Unfortunately, Judy Schmidt has changed the channel and now posts primarily on Astrodon.
The platform is independent, which I think is good, but unfortunately there is no mouse-over function there.
Personally, I find it a bit lonely there and without any real discussion.
The discussions in this forum here are much more exciting
and Ann's posts are my astronomical heartbeat anyway.

https://astrodon.social/@spacegeck

https://www.flickr.com/photos/geckzilla/
https://geckzilla.com/


I would be delighted if Geck would be active here again, or at least post one of his new masterpieces every now and then.

bigg: https://live.staticflickr.com/65535/536 ... 40c5_o.png

V838 Mon Light Echo (25. März 2024) Judy Schmidt Original data: NASA/ESA

"This view of the V838 Monocerotis light echo uses color to show the passage of time. As the bright flash of light left the star, it illuminated the dust surrounding it, but because space is so big, we see actually see the light travelling and illuminating the dust as it goes along. Each time Hubble looked at the light echo, it revealed only one layer, like the layers of an onion. Here, I've combined multiple layers into a single view, with the innermost one colored red. Next, orange, followed by yellow, green, cyan, blue, and violet. You could say red is the oldest light, and violet is the youngest. The result is a prismatic, rainbow-colored view of the dust cloud.
As a concept, light echoes are at first confusing, because we are not used to light being anything but an instant on or off. It's my hope that this image makes it a little less confusing, or at least offers one more way to try and understand the light echo. I also wanted to be able to view the dust cloud as a whole and try to make sense of the many flowing, liquidlike patterns within it.
I've removed the stars from each layer so that they wouldn't be too bright in the end result. Then I re-added them on their own isolated layer in white.Views from March 2002 to September 2006 were used to create this image. Red: 2002-05-20 Orange: 2002-09-02 Yellow: 2002-10-28 Gray: 2002-12-17 Green: 2004-02-08 Cyan: 2004-10-23 Blue: 2005 Oct, Nov, Dec (Multiple Dates) Violet: 2006-09-09"

johnnydeep wrote: ↑Sun Nov 17, 2024 7:56 pm In case it's not obvious, as it wasn't to me, the HH objects are shown in the mouse-over at the "featured image" link.

I think the fragments on both sides of Geck's image are, as Victor suspects, something like mini "pillars of creation".
Herbig-Haro objects are small, glowing nebulae that appear near young T Tauri stars. They are formed when a newborn star sends powerful jets of hot gas and plasma into the surrounding interstellar medium. These jets collide with the surrounding material and create shock waves that make the gas glow. I think that these exist in this case too, but they are further out. Soon JWST will show the truth.

bigger: https://live.staticflickr.com/65535/541 ... 3bcc_o.jpg
Original data: NASA/ESA composit AllWISE/SST/HERSCHEL/HST jac berne (flickr)

AVAO wrote: ↑Sun Nov 17, 2024 9:17 pm

johnnydeep wrote: ↑Sun Nov 17, 2024 7:56 pm In case it's not obvious, as it wasn't to me, the HH objects are shown in the mouse-over at the "featured image" link.

I think the fragments on both sides of Geck's image are, as Victor suspects, something like mini "pillars of creation".
Herbig-Haro objects are small, glowing nebulae that appear near young T Tauri stars. They are formed when a newborn star sends powerful jets of hot gas and plasma into the surrounding interstellar medium. These jets collide with the surrounding material and create shock waves that make the gas glow. I think that these exist in this case too, but they are further out. Soon JWST will show the truth.

Click to view full size image

bigger: https://live.staticflickr.com/65535/541 ... 3bcc_o.jpg
Original data: NASA/ESA composit AllWISE/SST/HERSCHEL/HST jac berne (flickr)

Interesting. So I guess the text is mistaken to call them HH objects.

johnnydeep wrote: ↑Sun Nov 17, 2024 10:56 pm

AVAO wrote: ↑Sun Nov 17, 2024 9:17 pm

johnnydeep wrote: ↑Sun Nov 17, 2024 7:56 pm In case it's not obvious, as it wasn't to me, the HH objects are shown in the mouse-over at the "featured image" link.

I think the fragments on both sides of Geck's image are, as Victor suspects, something like mini "pillars of creation".
Herbig-Haro objects are small, glowing nebulae that appear near young T Tauri stars. They are formed when a newborn star sends powerful jets of hot gas and plasma into the surrounding interstellar medium. These jets collide with the surrounding material and create shock waves that make the gas glow. I think that these exist in this case too, but they are further out. Soon JWST will show the truth.

Click to view full size image

bigger: https://live.staticflickr.com/65535/541 ... 3bcc_o.jpg
Original data: NASA/ESA composit AllWISE/SST/HERSCHEL/HST jac berne (flickr)

Interesting. So I guess the text is mistaken to call them HH objects.

We will see. See Henize_3-1475 with his knots - one PLN, but a comparison is worth it.

IRAS_17423-1755 Credit: NASA/ESA Judy Schmidt

AVAO wrote: ↑Sun Nov 17, 2024 8:11 pm

Cousin Ricky wrote: ↑Sun Nov 17, 2024 3:40 pm Geck! Can you drop by a moment, tell us how you’re doing?

Unfortunately, Judy Schmidt has changed the channel and now posts primarily on Astrodon.
The platform is independent, which I think is good, but unfortunately there is no mouse-over function there.
Personally, I find it a bit lonely there and without any real discussion.
The discussions in this forum here are much more exciting
and Ann's posts are my astronomical heartbeat anyway.

https://astrodon.social/@spacegeck

https://www.flickr.com/photos/geckzilla/
https://geckzilla.com/


I would be delighted if Geck would be active here again, or at least post one of his new masterpieces every now and then.

Click to view full size image

bigg: https://live.staticflickr.com/65535/536 ... 40c5_o.png

V838 Mon Light Echo (25. März 2024) Judy Schmidt Original data: NASA/ESA

"This view of the V838 Monocerotis light echo uses color to show the passage of time. As the bright flash of light left the star, it illuminated the dust surrounding it, but because space is so big, we see actually see the light travelling and illuminating the dust as it goes along. Each time Hubble looked at the light echo, it revealed only one layer, like the layers of an onion. Here, I've combined multiple layers into a single view, with the innermost one colored red. Next, orange, followed by yellow, green, cyan, blue, and violet. You could say red is the oldest light, and violet is the youngest. The result is a prismatic, rainbow-colored view of the dust cloud.
As a concept, light echoes are at first confusing, because we are not used to light being anything but an instant on or off. It's my hope that this image makes it a little less confusing, or at least offers one more way to try and understand the light echo. I also wanted to be able to view the dust cloud as a whole and try to make sense of the many flowing, liquidlike patterns within it.
I've removed the stars from each layer so that they wouldn't be too bright in the end result. Then I re-added them on their own isolated layer in white.Views from March 2002 to September 2006 were used to create this image. Red: 2002-05-20 Orange: 2002-09-02 Yellow: 2002-10-28 Gray: 2002-12-17 Green: 2004-02-08 Cyan: 2004-10-23 Blue: 2005 Oct, Nov, Dec (Multiple Dates) Violet: 2006-09-09"

Yes, Geck is sorely missed here, as her processing skills and incredible images are marvelous indeed! Her portrait of V838 Mon is as gorgeous as it is mindblowing as it is revealing. Bravo! Bravissimo!

But you, Jac, is also a master processor, and we are so privileged to see your fantastic images here! Thank you so much!

Ann

Ann wrote: ↑Mon Nov 18, 2024 11:10 am
Yes, Geck is sorely missed here, as her processing skills and incredible images are marvelous indeed! Her portrait of V838 Mon is as gorgeous as it is mindblowing as it is revealing. Bravo! Bravissimo!

But you, Jac, is also a master processor, and we are so privileged to see your fantastic images here! Thank you so much!

Ann

ThanX Ann you're making me embarrassed. But I think we have a really good team on board with the hard core here in the forum. But Geck is in the master class and Chris is a genius anyway. Unfortunately I usually don't have more than an hour time in the morning and I make a sport out of finding one or two exciting flashes on the topic in the depths of space in this limited time. That's all. Jac