%0 Generic %1 meiksin2017around %A Meiksin, Avery %A Bolton, James S. %A Puchwein, Ewald %D 2017 %K covering fraction quasars %R 10.1093/mnras/stx191 %T Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite %U http://arxiv.org/abs/1701.06948 %X 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.

@misc{meiksin2017around, 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.}, added-at = {2017-01-25T11:07:14.000+0100}, author = {Meiksin, Avery and Bolton, James S. and Puchwein, Ewald}, biburl = {https://www.bibsonomy.org/bibtex/235ffc942d647e19a2a6c59042e3f8799/miki}, description = {[1701.06948] Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite}, doi = {10.1093/mnras/stx191}, interhash = {1b3668e035ff64ed47f9664da9baffbc}, intrahash = {35ffc942d647e19a2a6c59042e3f8799}, keywords = {covering fraction quasars}, note = {cite arxiv:1701.06948Comment: 11 pages, 10 figures; to appear in MNRAS}, timestamp = {2017-01-25T11:07:14.000+0100}, title = {Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite}, url = {http://arxiv.org/abs/1701.06948}, year = 2017 }