QSO metal absorption systems as a probe of galaxy formation.

Details QSO metal absorption systems as a probe of galaxy formation. QSO metal absorption systems as a probe of galaxy formation.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997areps...1...93h&link_type=abstract

Astrophysics Reports, Special Issue, No. 2, p. 93 - 99

Astronomy and Astrophysics

Astrophysics

Quasars: Absorption Systems, Quasars: Galaxy Formation

Scientific paper

In a hierarchical cosmogony present-day galaxies build up by continuous merging of smaller structures. Hydrodynamical simulations were combined with a photoionization code to calculate the metal absorption properties of regions of ongoing galaxy formation. Predictions of the spatial distribution of H I, C II, C IV, Si IV and O VI are presented. The observed column density ratios of the different ionic species can be well reproduced if a mean metallicity [Z/H] = -2.5, relative abundances as found in metal-poor stars and an UV background as proposed by Haardt & Madau are assumed. The observed scatter in [C/H] is about a magnitude larger than that in the simulations suggesting an inhomogeneous metal distribution caused by in situ enrichment.

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