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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709893.0, MPI für Astronomie / Publikationen_mpia
The extent of the Mg II absorbing circumgalactic medium of quasars
Authors:Farina, E. P.; Falomo, R.; Scarpa, R.; Decarli, R.; Treves, A.; Kotilainen, J. K.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:886
End Page:899
Audience:Not Specified
Abstract / Description:We investigate the extent and the properties of the Mg II cool, low-density absorbing gas located in the halo and in the circumgalactic environment of quasars, using a sample of 31 projected quasar pairs with impact parameter pd < 200 kpc in the redshift range 0.5 &lsim; z &lsim; 1.6. In the transverse direction, we detect 18 Mg II absorbers associated with the foreground quasars, while no absorption system originated by the gas surrounding the quasar itself is found along the line of sight. This suggests that the quasar emission induces an anisotropy in the absorbing gas distribution. Our observations indicate that the covering fraction (fC) of Mg II absorption systems with rest-frame equivalent width Wr(lambda2796) > 0.3 Å ranges from fC &tilde; 1.0 at pd &lsim; 65 kpc to fC &tilde; 0.2 at pd &gsim; 150 kpc, and appears to be higher than that for galaxies. Our findings support a scenario where the luminosity/mass of the host galaxies affect the extent and the richness of the absorbing Mg II circumgalactic medium.
Free Keywords:galaxies: haloes; quasars: absorption lines; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stu585
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