https://mastodon.social/@pomarede/112339170146519848 pomarede@mastodon.social - Taylor Swift as an hypermagnetized neutron star
#TaylorSwift #astrophysics #Swifties #neutron #star #neutronstar #magnetar #physics #astronomy #astrodon #meme #science #memes #sciencememes #space #STEM
https://mastodon.online/@umplus/112175055235649848 umplus@mastodon.online - #UMPlus - Magical night in Atacama
https://www.universomagico.net/2024/03/noche-magica-en-atacama.html
Astronomer Petr Horálek has produced a magical image. The Atacama Desert has been the setting chosen to photograph a spectacularly colorful sky in which the bright stars, which give light to the sky, become the protagonists. In addition, the red color of the hydrogen atoms ionized by the energetic stars is distributed throughout the galaxy, tinting the.....
#astronomy #space #astrophysics #astrophotography
A recent paper attempts to say that maybe the distance of NGC 1052-DF4 is actually 17 Mpc, not 20 Mpc after all ! GASP !
Why is this in any way interesting ? Well, DF4 was one of those galaxies claimed to lack dark matter. The distance in this case matters a lot : if it was at 20 Mpc, it'd be weird, but if it was only 13 Mpc, it'd be normal. Independent measurements have confirmed it's actually 20 Mpc, so it is indeed a strange object after all. But then, simulations found a way to produce such an object just by rare but physically-normal conditions : in the right circumstances, it is possible to strip the dark matter from a dwarf galaxy but leave its stars intact.
The authors of this paper say there should still be some signatures of tidal interactions left over though, so they go looking for them with incredibly deep imaging. They confirm that this is the case for the similarly-famous galaxy NGC 1052-DF2 (thought I'm skeptical of this), but very clearly show that DF4 is undisturbed. Absolutely nothing is going on in its outskirts at all. This is the reason they propose that the distance controversy might need to be re-ignited, noting that other galaxies in the region have been found to be at 17 Mpc rather than 20 Mpc.
To me this feels like a weak and circumstantial argument, and 17 Mpc wouldn't be enough to explain the lack of dark matter anyway. Not only that, but this ignores the now-sizeable population of other galaxies with similar claims for serious dark matter deficiencies.
#Space
#Science
#Astronomy
#Astrophysics
https://llittlephysicists.blogspot.com/2024/02/back-from-grave.html
On arXiv today, a very nice paper shows that one of the largest optically dark gas clouds isn't quite optically dark after all : it has at least one small patch of very new star formation. It's optically pathetic but the data is good enough that it's definitely real. This has implications for the formation of the cloud itself, which now looks more likely to be the result of ram pressure stripping from one of the galaxies in the vicinity. Many questions still remain, however, not least as to why only a very small part of the cloud is forming stars and why it's apparently only just started doing so.
#Science
#Astronomy
#Astrophysics
#Galaxies
https://llittlephysicists.blogspot.com/2024/02/taking-galactic-paternity-test.html
Another strange isolated dark matter-dominated galaxy. Fun times, but a bit much to reach for new physics here.
#Science
#Astrophysics
#Space
#Galaxies
https://llittlephysicists.blogspot.com/2024/02/another-one-for-collection.html
Hello, I'm sharing my astrophysics model, it's an unification theory to explain quantum gravity via the strong nuclear force:
https://researchgate.net/publication/371896737
#astrophysics, #darkenergy, #darkmatter, #nuclear, #physics y #quantum.
https://www.nasa.gov/news-release/after-three-years-on-mars-nasas-ingenuity-helicopter-mission-ends/
A look at dark galaxies from a theoretical perspective. What keeps dark matter halos from lighting up ? Nothing fancy, say the authors, just a combination of isolation, spin, and low mass. Ho-hum. All well and good, but their lack of any distinct comparison with observations is a mite frustrating.
#Science
#Astronomy
#Astrophysics
#Galaxies
https://llittlephysicists.blogspot.com/2024/01/theoretically-dark.html
NASA working to solve Voyager 1 computer glitch from billions of miles away | CNN https://edition.cnn.com/2023/12/13/world/voyager-1-computer-issue-scn/index.html
Tags: #dandelíon #science #astrophysics
via dandelion* client (Source)
Excellent summary of the current state of the argument as to whether binary stars observed in Gaia favour dark matter or modified gravity. TLDW : prominent MOND supporter completely changes their mind and finds 16 sigma (!) significance evidence that MOND doesn't work. Previous test using the same data included points with much too large errors and found the opposite result. Doesn't actually validate dark matter, just disproves MOND.
A short paper that says while galaxies molecular gas has been declining since the peak of star formation, their atomic mass has actually kept growing. So somehow their star formation activity is becoming ever-less efficient. Annoyingly, they don't bother to speculate as to what might be causing this though.
#Science
#Astronomy
#Galaxies
#Astrophysics
https://llittlephysicists.blogspot.com/2023/10/its-gotta-come-from-somewhere.html
Another paper about Ultra Diffuse Galaxies, haven't read one of those in a while. I'm a bit disappointed that an ostensibly HI-based paper is actually all about optical scaling relations, and with only one HI-UDG detection there's really not much they can say about it. Still, the target field itself - a "supergroup" - is a pretty interesting place, with not many galaxies but somehow enough hot X-ray gas to strip the HI. That's not at all typical for groups this small.
#Science
#Astronomy
#Galaxies
#Astrophysics
https://llittlephysicists.blogspot.com/2023/10/is-it-group-is-it-cluster-no-its.html
Parti dans l'azur
L'heure de s'émerveiller
Cosmos accessible
Photo : Rama, 2008, CC BY-SA 2.0 FR https://creativecommons.org/licenses/by-sa/2.0/fr/deed.en, via Wikimedia Commons.
#RIP #sciences #astronomie #astronomy #astrophysique #astrophysics #Reeves
#hommage #haiku
