The Cosmological Evolution of Quasar Damped Lyman-Alpha Systems
| dc.creator | Rao, Sandhya | |
| dc.date | 2000-09-06 | |
| dc.date.accessioned | 2026-07-07T01:55:21Z | |
| dc.date.available | 2026-07-07T01:55:21Z | |
| dc.description | We present results from an efficient, non-traditional survey to discover damped Lyman-alpha (DLA) absorption-line systems with neutral hydrogen column densities N(HI)>2x10^{20} atoms cm^{-2} and redshifts z<1.65. Contrary to previous studies at higher redshift that showed a decrease in the cosmological mass density of neutral gas in DLA absorbers, Omega_{DLA}, with time, our results indicate that Omega_{DLA} is consistent with remaining constant from redshifts z \approx 4 to z \approx 0.5. There is no evidence that Omega_{DLA} is approaching the value at z=0. Other interesting results from the survey are also presented. | |
| dc.description | To appear in "Gas and Galaxy Evolution", ASP Conference Series, eds. Hibbard, Rupen, and van Gorkum. 4 pages, 5 encapsulated postscript figures. newpasp.sty included | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0009098 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0009098 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1625 | |
| dc.subject | Astrophysics | |
| dc.title | The Cosmological Evolution of Quasar Damped Lyman-Alpha Systems | |
| dc.type | text |