Journal Article

The rise of the C <span class="smallCaps">iv</span> mass density at <i>z</i> < 2.5*

Valentina D'Odorico, Francesco Calura, Stefano Cristiani and Matteo Viel

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 4, pages 2715-2721
Published in print February 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI:
The rise of the C iv mass density at z < 2.5*

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The cosmic evolution of the metal content of the intergalactic medium puts stringent constraints on the properties of galactic outflows and on the nature of UV background. In this paper, we present a new measure of the redshift evolution of the mass density of C iv, ΩC iv, in the interval 1.5 ≲z≲ 4 based on a sample of more than 1500 C iv lines with column densities 1012N(C IV) ≲ 1015 cm−2. This sample more than doubles the absorption redshift path covered in the range z < 2.5 by previous samples. The result shows a significant increase of ΩC iv towards the lower redshifts at variance with the previously pictured constant behaviour.

Keywords: intergalactic medium; quasars: absorption lines; cosmology: observations

Journal Article.  4973 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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