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#galaxies

17 posts16 participants3 posts today
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IRAP

[Un peu de #cosmologie ...] Comment les fluctuations quantiques de l' #Univers primordial ont-elles donné lieu aux #structures gravitationnelles qui le peuplent aujourd'hui : amas de galaxies, #galaxies, etc ? Comment l' #astronomie des ondes gravitationelles peut-elle nous éclairer sur la courte phase d' #expansion accélérée de l'Univers s'étant produite voici 13 milliards d'années ?

Autant de questions auxquelles Sebastien Renaux-Petel, chercheur à l' @astroIAP (Institut d'astrophysique de Paris), répondra, ce jeudi, lors d'un séminaire organisé à l'IRAP : irap.omp.eu/event/how-gravitat

How gravitational-wave astronomy can shed light on the dark ages of inflation
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Claude Trudel

Cosmographie : la nouvelle carte des courants cosmiques fait la couverture de Nature Astronomy
🔸 Les galaxies sont soumises à deux phénomènes antagonistes
irfu.cea.fr/Phocea/Vie_des_lab
#astronomie #astrophysique #science #courantcismique #cosmologie #cosmos #vélocité #simulation #tech #calcul #vidéo #expansion #gravité #galaxies #amas #superamas #IRFU #carte #cartographie #3D #animation

L'Irfu, Institut de Recherche sur les lois Fondamentales de l'UniversCosmographie : la nouvelle carte des courants cosmiques fait la couverture de Nature AstronomyAprès la découverte l’an dernier de la grande structure cosmologique Ho’oleilana, en utilisant simplement les positions des galaxies du catalogue Cosmicflows-4, c’est maintenant l’analyse de leurs vitesses qui fait l’objet de cette nouvelle publication, aux enseignements multiples.
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Enrique Boeneker

I found out from Wikipedia that this distant object is called Sarah's Galaxy. I find this name more appropriate than the ordinary and vulgar one that people call it. Sarah's Galaxy refers to Sarah Williams, who wrote this poem that is all me now:

"Though my soul may set in darkness, it will rise in perfect light;
I have loved the stars too truly to be fearful of the night."
The Old Astronomer

Seen edge-on, NGC 3628 is known to be a spiral galaxy. However, its profile is odd. Looks thick to me, and its extremes look thicker. I assume this oddness is due to its many interactions with its neighbors, which form the famous Leo's Triplet.
#astronomy#astrophotography#Astrodon
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CosmicRami

Updated diagram version for #SciComm usage!

Have stitched together the annotated image, along with that excellent diagram from The Planetary Society.

Someone said to me last night that this looks like a half-cut avocado, and now I cannot unsee it lolololol

Such a great image, and another fine example of how physics allows us to see around corners!

📸 ESA/Webb, NASA & CSA, G. Mahler & Planetary Society

Three tile image with two images in top row. Top row: In the centre is an elliptical galaxy, seen as an oval-shaped glow around a small bright core. Around this is wrapped a broad band of light, appearing like a spiral galaxy stretched and warped into a ring, with bright blue lines drawn through it where the spiral arms have been stretched into circles. A few distant objects are visible around the ring on a black background. The image has been annotated to point out the foreground galaxy as well as the background spiral. In the bottom row: Diagram showing the JWST on one side with light being focused into it from a distant galaxy, via an intermediate galaxy. The Galaxy appears as a ring as light scattered in all directions is delivered to the focal point.
#JWST#Astrodon#Science
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Massimo Luciani

#astronomy #cosmology #JWST #galaxies #reionization

An article published in the journal "Nature" reports the results of observations of the primordial galaxy JADES-GS-z13-1. A team of researchers used the James Webb Space Telescope to examine this galaxy, estimating that it dates back to about 330 million years after the Big Bang. The surprise came from the so-called Lyman-alpha radiation because it was much stronger than expected from a galaxy of that era.

english.tachyonbeam.com/2025/0

english.tachyonbeam.comAn intense primordial light from the dark ages of the universeAn article published in the journal 'Nature' reports the results of observations of the primordial galaxy cataloged as JADES-GS-z13-1. A team of researchers...
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CosmicRami

Whooooaaaa! The new #JWST image is so good! So much physics going on — physics Einstein himself thought about!

This is called an Einstein Ring. When a massive foreground galaxy (in this case, an elliptical galaxy) warps the space-time around it, light from behind it bends in our direction.

The JWST caught this fantastic example, where the background spiral galaxy is getting warped into our view. It appears as a ring, but we can see its structures like its spiral arms, gas features and star clusters.

Incredible science happening here!

📸 ESA/Webb/NASA/CSA/G. Mahler

I added the annotations in the second image.

In the centre is an elliptical galaxy, seen as an oval-shaped glow around a small bright core. Around this is wrapped a broad band of light, appearing like a spiral galaxy stretched and warped into a ring, with bright blue lines drawn through it where the spiral arms have been stretched into circles. A few distant objects are visible around the ring on a black background.
In the centre is an elliptical galaxy, seen as an oval-shaped glow around a small bright core. Around this is wrapped a broad band of light, appearing like a spiral galaxy stretched and warped into a ring, with bright blue lines drawn through it where the spiral arms have been stretched into circles. A few distant objects are visible around the ring on a black background. The image has been annotated to point out the foreground galaxy as well as the background spiral.
#astronomy#astrophysics#generalrelativity
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