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Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite
- Publication Year :
- 2017
-
Abstract
- Modern theories of galaxy formation predict that galaxies impact on their gaseous surroundings, playing the fundamental role of regulating the amount of gas converted into stars. While star-forming galaxies are believed to provide feedback through galactic winds, Quasi-Stellar Objects (QSOs) are believed instead to provide feedback through the heat generated by accretion onto a central supermassive black hole. A quantitative difference in the impact of feedback on the gaseous environments of star-forming galaxies and QSOs has not been established through direct observations. Using the Sherwood cosmological simulations, we demonstrate that measurements of neutral hydrogen in the vicinity of star-forming galaxies and QSOs during the era of peak galaxy formation show excess LyA absorption extending up to comoving radii of about 150 kpc for star-forming galaxies and 300 - 700 kpc for QSOs. Simulations including supernovae-driven winds with the wind velocity scaling like the escape velocity of the halo account for the absorption around star-forming galaxies but not QSOs.<br />11 pages, 10 figures; to appear in MNRAS
- Subjects :
- Radio galaxy
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Galaxy merger
01 natural sciences
Peculiar galaxy
Galaxy group
0103 physical sciences
galaxies: formation
Astrophysics::Solar and Stellar Astrophysics
Disc
010303 astronomy & astrophysics
Lenticular galaxy
Astrophysics::Galaxy Astrophysics
Luminous infrared galaxy
Physics
Galaxies: formation, Intergalactic medium, Quasars: absorption lines, Largescale structure of Universe
010308 nuclear & particles physics
Astronomy
Astronomy and Astrophysics
cosmology: large-scale structure of Universe
Astrophysics - Astrophysics of Galaxies
quasars: absorption lines
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Elliptical galaxy
intergalactic medium
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....b71fe3ae73c39bd69270573155c9ec2c