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

Дата и время публикации : 2001-01-12T17:54:51Z

Авторы публикации и институты :
Celine Peroux (Institute of Astronomy, University of Cambridge, UK)
Richard G. McMahon (Institute of Astronomy, University of Cambridge, UK)
Mike Irwin (Institute of Astronomy, University of Cambridge, UK)
Lisa J. Storrie-Lombardi (SIRTF Science Center, California Institute of Technology, Pasadena, US)

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Коментарии к статье: 3 pages, 2 figures. To appear in the proceedings of the “Cosmic Evolution” conference, held at l’Institut d’Astrophysique de Paris, November 13-17, 2000
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: 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.

Category: Physics