Circumgalactic medium of quasars: C IV absorption systems

Journal
Date Issued
2016
Author(s)
•
Falomo, R.
•
Treves, A.
•
Scarpa, R.
•
Farina, E. P.
DOI
Abstract
We investigate the properties of circumgalactic gas in the halo of quasar (QSO) host galaxies from C IV absorption-line systems. We use the optical spectroscopy of closely aligned pairs of quasars (projected distance ≤ 200 kpc) obtained at the Gran Telescopio Canarias to investigate the distribution of the absorbing gas for a sample of 18 quasars at z ∼ 2. We have found that the detected absorption systems of EW ≥ 0.3 Å associated with the foreground QSOs are revealed up to 200 kpc from the centre of the host galaxy. The structure of the absorbing gas is patchy with a covering fraction of the gas that quickly decreases beyond 100 kpc. These results are in qualitative agreement with those found for the lower ionization metal Mg II λ2800 Å.
Volume
457
Issue
1
Start page
267
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.457..267L
Rights
open.access
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