#galaxies

À partir des données de HETDEX, des astronomes rapportent des dizaines de milliers d’énormes halos de gaz hydrogène autour de galaxies datant d’il y a 10 à 12 milliards d’années, apportant un nouvel appui aux idées sur la croissance des premières galaxies à l’aube cosmique

L’Instrument Spectroscopique d’Énergie Noire a terminé une enquête de cinq ans qui a capturé plus de 47 millions de galaxies et de quasars, produisant la carte la plus détaillée de l’univers à ce jour.

A new Hubble image of IC 486 highlights a barred spiral galaxy 380 million light-years away, where recent star formation and a bright active galactic nucleus coexist in the same luminous structure.

A newly reported galaxy, NGC 1052-DF9, adds to a small but consequential set of systems that appear to exist without dark matter, lending support to the controversial ‘Bullet Dwarf’ collision scenario.

A new study of more than 1 million galaxies and over 8,000 actively growing supermassive black holes points to a simple explanation for the modern slowdown in black hole growth: not enough cold gas.

Astronomers have directly measured superheated gas blasting out of the starburst galaxy M82 at more than 3.2 million kilometers per hour, strengthening the case for a stellar-driven outflow.

La mission XRISM de la NASA et de la JAXA a mesuré directement la vitesse du gaz surchauffé s’échappant de la galaxie starburst M82, apportant de nouveaux éléments sur ce qui alimente les vents à l’échelle galactique.

A massive international collaboration using the James Webb Space Telescope and ALMA has identified 70 dusty galaxies from the universe's first billion years. These ancient objects appear to have formed stars far earlier than current models predict, potentially forcing a fundamental reassessment of how galaxies evolve.