The circum-galactic medium of quasars: CIV absorption systems

Abstract

We investigate the properties of the circumgalactic gas in the halo of quasar host galaxies from CIV absorption line systems. Optical spectroscopy of closely aligned pairs of quasars (projected distance \leq 200 kpc) obtained at the Gran Telescopio Canarias is used to investigate the distribution of the absorbing gas for a sample of 18 quasars at z \sim 2. We found that the detected absorption systems of EW \geq 0.3Ang associated with the foreground QSO are revealed up to 200 kpc from the center of the host galaxy. The structure of the absorbing gas is rather 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 ionisation metal Mg II 2800 Ang.

Very minor revision . Accepted for publication in MNRAS

References in corpus (7)

• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367
• Quasars Probing Quasars II: The Anisotropic Clustering of Optically Thick Absorbers around Quasars
• Quasars Probing Quasars VII. The Pinnacle of the Cool Circumgalactic Medium Surrounds Massive z~2 Galaxies
• ESO-VLT optical spectroscopy of BL Lac objects: II. New redshifts, featureless objects and classification assessments
• The Baryon Content of Dark Matter Halos: Empirical Constraints from MgII Absorbers
• The extent of the MgII absorbing circum-galactic medium of quasars

Cited by in corpus (9)

• MusE GAs Flow and Wind (MEGAFLOW) VI. A study of CIV and MgII absorbing gas surrounding [OII] emitting galaxies
• Extended Ly$\alpha$ emission around quasars with eclipsing damped Ly$\alpha$ systems
• The correlated variations of C IV narrow absorption lines and quasar continuum
• Evolution of CIV Absorbers. II. Where does CIV live?
• The Study of Circumgalactic Medium with Quasar Pairs
• The Cosmic Evolution of CIV Absorbers at $1.4<z<4.5$: Insights from $100,000$ Systems in DESI Quasars
• Circum-galactic medium in the halo of quasars
• Absorption systems at $z\sim 2$ as a probe of the circum galactic medium: a probabilistic approach
• Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program