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Circum-galactic medium in the halo of quasars

Journal
Date Issued
2017
Author(s)
Ottolina, Riccardo
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•
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Kotilainen, Jari K.
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Scarpa, Riccardo
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Farina, Emanuele Paolo
DOI
Abstract
The properties of circum-galactic gas in the halo of quasar host galaxies are investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along the line of sight close to quasars. We use optical spectroscopy of closely aligned pairs of quasars (projected distance ≤ 200 kpc, but at very different redshift) obtained at the VLT and Gran Telescopio Canarias to investigate the distribution of the absorbing gas for a sample of quasars at z∼1. Absorption

̊ associated with the foreground quasars are revealed up to 200 kpc systems of EW ≥ 0.3 A from the centre of the host galaxy, showing that the structure of the absorbing gas is patchy with a covering fraction quickly decreasing beyond 100 kpc. We used optical and near-IR images obtained at VLT to investigate the relations between the properties of the circum-galactic medium of the host galaxies and of the large scale galaxy environments of the foreground quasars.

Volume
4
Uri
Url
Issn Identifier
2296-987X
Ads BibCode
2017FrASS...4...61O
Rights
open.access
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