Cosmological Evolution of the Universe Neutral Gas Mass Measured by Quasar Absorption Systems

Details Cosmological Evolution of the Universe Neutral Gas Mass Measured by Quasar Absorption Systems Cosmological Evolution of the Universe Neutral Gas Mass Measured by Quasar Absorption Systems

2001-01-12

arxiv.org/abs/astro-ph/0101212v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures. To appear in the proceedings of the "Cosmic Evolution" conference, held at l'Institut d'Astrophysique de P

Scientific paper

The cosmological evolution of neutral hydrogen is an efficient way of tracing structure formation with redshift. It indicates the rate of evolution of gas into stars and hence the gas consumption and rate star formation history of the Universe. In measuring HI, quasar absorbers have proven to be an ideal tool and we use observations from a recent survey for high-redshift quasar absorption systems together with data gathered from the literature to measure the cosmological comoving mass density of neutral gas. This paper assumes Omega_M=0.3, Omega_lambda=0.7 and h=0.65.

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