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The cosmological bias factor of damped Lyman alpha systems: dependence on metal line strength
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SYSNO ASEP 0545812 Document Type J - Journal Article R&D Document Type The record was not marked in the RIV Subsidiary J Článek ve WOS Title The cosmological bias factor of damped Lyman alpha systems: dependence on metal line strength Author(s) Perez Rafols, I. (FR)
Miralda Escude, J. (ES)
Arinyo i Prats, Andreu (UIVT-O) SAI
Font Ribera, A. (GB)
Mas Ribas, L. (ES)Number of authors 5 Source Title Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 480, č. 4 (2018), s. 4702-4709Language eng - English Country GB - United Kingdom Keywords mass-metallicity relation ; digital sky survey ; neutral hydrogen ; galaxies ; evolution ; gas ; abundances ; telescope ; space ; intergalactic medium ; cosmological parameters ; large-scale structure of Universe ; cosmology: observations UT WOS 000449617100032 EID SCOPUS 85054283966 DOI 10.1093/mnras/sty2158 Annotation We measure the cosmological bias factor of damped Ly alpha absorbers (DLAs) from their cross-correlation with the Ly alpha forest absorption, as a function of the DLA metal strength, defined from an average of equivalent widths of the strongest detectable low-ionization metal lines. A clear increase of the bias factor with metal strength is detected, as expected from a relation of metallicity and velocity dispersion with host halo mass. The relation is stronger after the metal strength is corrected for the H I column density, to make it more related to metallicity instead of metal column density. After correcting for the effects of measurement errors of the metal strength parameter, we find that the bias factor of DLAs with the weakest metal lines is close to unity, consistent with an origin in dwarf galaxies with host halo masses similar to 10(10) M-circle dot, whereas the most metal rich DLAs have a bias factor as large as b(DLA) similar to 3, indicative of massive galaxies or galaxy groups in host haloes with masses similar to 10(12) M-circle dot. Our result confirms the physical origin of the relation of bias factors measured from cross-correlation studies to the host haloes of the absorbers. Workplace Institute of Computer Science Contact Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Year of Publishing 2022
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