@florianpacaud.bsky.social
Astrophysicien des rayons X et cosmologiste X-ray astrophysicist and cosmologist
Il faut probablement ajouter à cela le spectre du soleil lui-même. Il produit moins de violet que de bleu.
04.12.2024 09:00 — 👍 0 🔁 0 💬 1 📌 0Second, the decision to split the sky in two dates back from way before. It was a decision made by the collaboration (but mostly pushed for by the Russians) on how to share / work on the data. Germany committed to making their share public. We do not know what Russia will do in the future.
30.11.2024 11:20 — 👍 0 🔁 0 💬 0 📌 0Actually, this is not exactly what happened. First, the Russian would have had no problem going on with the survey. The decision to pause after only half the data were obtained comes from Germany (more precisely, the European sanctions against the Russian invasion, which forbid such collaboration).
30.11.2024 11:18 — 👍 1 🔁 0 💬 1 📌 0Given the weakness of the signaI, it however remains unclear at this point whether we do detect the diffuse gas in this filament or just the cumulative emission of all the small galaxy groups and galaxies that it contains.
30.11.2024 10:17 — 👍 1 🔁 0 💬 0 📌 0This is the longest filament in which such a detection was possible, but also the clearest because the clusters are so well separated in the sky.
30.11.2024 10:14 — 👍 1 🔁 0 💬 1 📌 0Large-scale filaments between galaxy clusters are expected to contain 30% of the normal matter in the local Universe but this has hardly ever been observed in practice.
30.11.2024 10:13 — 👍 1 🔁 0 💬 1 📌 0
Our detection of a cosmic filament in the X-rays with #eROSITA is the feature image of the last issue of Astronomy & Astrophysics !
www.aanda.org/articles/aa/...
#cosmology #xrayastronomy
The Carina Nebula or Eta Carinae Nebula is a large, complex area of bright and dark nebulosity in the constellation Carina, located in the Carina–Sagittarius Arm of the Milky Way galaxy. The nebula is approximately 8,500 light-years from Earth.
The Carina Nebula
26.11.2024 23:48 — 👍 6342 🔁 331 💬 113 📌 35
Galaxy in Space Warps: ESA Euclid with unusual shape.
Galaxy in Space Warps: ESA Euclid with unusual shape.
Galaxy in Space Warps: ESA Euclid with unusual shape.
Galaxy in Space Warps: ESA Euclid with unusual shape.
#ESAEuclid's 'Space Warps' #citizenscience search for gravitational lenses is still running. You can participate!
www.euclid-ec.org/space-warps-...
#astronomy #ESA #Euclid #space
Laniakea: Our home supercluster
Check out this video produced by Nature, on the occasion of the discovery of the supercluster of galaxies that is home to our own galaxy, the Milky Way.
Those seen outside the galactic plane are supermassive black holes in distant galaxies (active nuclei) or clusters of galaxies, themselves containing up to 1000 galaxies!
23.11.2024 10:41 — 👍 1 🔁 0 💬 0 📌 0The bright and more compact sources located close to the galactic plane are mainly pulsars (rotating neutron stars), binary systems consisting of a star rotating around a neutron star or a black hole, or the hot material left over by ancient supernova explosions.
23.11.2024 10:40 — 👍 1 🔁 0 💬 0 📌 0The dark horizontal line in the middle corresponds to the plane of the Milky Way, which absorbs the X-rays. The two yellow circular structures in the centre are the eROSITA bubbles, and appear to originate from matter ejected by the supermassive black hole at the centre of our Galaxy.
23.11.2024 10:37 — 👍 1 🔁 0 💬 0 📌 0
Have you ever wondered what the Universe would look like, if seen through X-ray eyes ? Here is the answer from the eROSITA satellite !
23.11.2024 10:34 — 👍 10 🔁 2 💬 3 📌 0Celles que l'on voit en dehors du plan galactique sont des trous noirs supermassifs dans des galaxies distantes (noyaux actifs) ou bien des amas de galaxies, contenant eux-mêmes jusqu'à 1000 galaxies !
23.11.2024 10:16 — 👍 0 🔁 0 💬 0 📌 0Les sources brillantes, plus compactes, situées près du plan galactique sont principalement des pulsars (étoiles à neutron en rotation), des systèmes binaires constitués d'une étoile tournant autour d'une étoile à neutron ou d'un trou noir, ou bien les restes d'anciennes explosions de supernovae.
23.11.2024 10:15 — 👍 0 🔁 0 💬 0 📌 0Le trait horizontal sombre, au milieu, correspond au plan de la Voie Lactée, qui absorbe les rayons X. Les deux structures circulaires jaunes, au centre, son les bulles d'eROSITA et semblent provenir de matière éjectée depuis les environs du trou noir supermassif situé au centre de la Galaxie.
23.11.2024 10:14 — 👍 0 🔁 0 💬 0 📌 0
Vous êtes vous déjà demandés à quoi ressemble l'Univers, vu en rayons X ? Voici la réponse grâce au satellite eROSITA !
23.11.2024 09:56 — 👍 9 🔁 3 💬 3 📌 0
