by Ann » Wed Sep 18, 2024 3:44 am
AVAO wrote: ↑Tue Sep 17, 2024 10:22 pm
sc02492 wrote: ↑Tue Sep 17, 2024 9:57 am
Ann wrote: ↑Tue Sep 17, 2024 6:02 am
What I find interesting about this image is that we can see large-scale structures in the shape of long twisted "tubes", and then there is a lot of small-scale turbulence inside those tubes.
What keeps the small-scale turbulence contained inside those long tubes?
Ann
It's important to distinguish between true turbulence, which is a dynamic process involving chaotic changes in a fluid medium like liquid or gas, versus the illusion of turbulence created by the "static" signals used to create the image. I've become very fond of the Hubble Palette in the past several years because it creates interesting contrast changes within the image, when SII regions (red) merge into HII regions (green) to create yellow, for instance. When you actually process these images and see them blossom right before your eyes on the computer screen, it's really quite amazing and aesthetically pleasing. However, I have always interpreted this appearance as a static phenomenon representing the mapping of various regions of emission (SII, HII, OIII), as opposed to having anything to do with "turbulence".
Thank you for your very exciting and informative input. But I think there is a misunderstanding here. Ann tried to describe his visual perception. However, speaking of turbulence is probably a somewhat unfortunate description. Normally, this is used to characterise chaotic substructures. In this case, it probably means
fragmented substructures within the very clearly visible helical main filament structures. In other wavelengths, such as in the IR, other characteristics emerge.
Original data: NASA/ESA DSS2/HERSCHEL
Original data: NASA/ESA SST/ALLWISE
Thanks, Jac! Yes indeed, I used the wrong word here. The substructures are fragmented, not chaotic.
Ann
P.S. I'm a woman.
- Grumpy woman.png (158.21 KiB) Viewed 702 times
Maybe not quite so grumpy!
[quote=AVAO post_id=341286 time=1726611727 user_id=144694]
[quote=sc02492 post_id=341276 time=1726567030 user_id=129470]
[quote=Ann post_id=341274 time=1726552957 user_id=129702]
What I find interesting about this image is that we can see large-scale structures in the shape of long twisted "tubes", and then there is a lot of small-scale turbulence inside those tubes.
What keeps the small-scale turbulence contained inside those long tubes?
Ann
[/quote]
It's important to distinguish between true turbulence, which is a dynamic process involving chaotic changes in a fluid medium like liquid or gas, versus the illusion of turbulence created by the "static" signals used to create the image. I've become very fond of the Hubble Palette in the past several years because it creates interesting contrast changes within the image, when SII regions (red) merge into HII regions (green) to create yellow, for instance. When you actually process these images and see them blossom right before your eyes on the computer screen, it's really quite amazing and aesthetically pleasing. However, I have always interpreted this appearance as a static phenomenon representing the mapping of various regions of emission (SII, HII, OIII), as opposed to having anything to do with "turbulence".
[/quote]
Thank you for your very exciting and informative input. But I think there is a misunderstanding here. Ann tried to describe his visual perception. However, speaking of turbulence is probably a somewhat unfortunate description. Normally, this is used to characterise chaotic substructures. In this case, it probably means [b]fragmented[/b] substructures within the very clearly visible helical main filament structures. In other wavelengths, such as in the IR, other characteristics emerge.
[imghover="https://live.staticflickr.com/65535/54003202363_e589a4abca_b.jpg"]https://live.staticflickr.com/65535/54003202423_5f11a5bb7d_b.jpg[/imghover]
[size=75]Original data: NASA/ESA DSS2/HERSCHEL[/size]
[img2]https://live.staticflickr.com/65535/54003387720_4ca7355873_b.jpg[/img2]
[size=75]Original data: NASA/ESA SST/ALLWISE [/size]
[/quote]
Thanks, Jac! Yes indeed, I used the wrong word here. The substructures are fragmented, not chaotic.
Ann
P.S. I'm a woman.
[attachment=0]Grumpy woman.png[/attachment]
Maybe not quite so grumpy! :D