Journal Article

Circumgalactic medium of quasars: C iv absorption systems

M. Landoni, R. Falomo, A. Treves, R. Scarpa and E. P. Farina

in Monthly Notices of the Royal Astronomical Society

Volume 457, issue 1, pages 267-271
ISSN: 0035-8711
Published online January 2016 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/stv2964
Circumgalactic medium of quasars: C iv absorption systems

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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.

Keywords: quasars: absorption lines; quasars: general

Journal Article.  2949 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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