A1 Refereed original research article in a scientific journal
Circum-Galactic Medium in the Halo of Quasars
Authors: Riccardo Ottolina, Renato Falomo, Aldo Treves, Michela Uslenghi, Jari K. Kotilainen, Riccardo Scarpa, Emanuele Paolo Farina
Publisher: FRONTIERS MEDIA SA
Publication year: 2017
Journal: Frontiers in Astronomy and Space Sciences
Journal name in source: FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
Journal acronym: FRONT ASTRON SPACE
Article number: UNSP 61
Volume: 4
Issue: 61
Number of pages: 4
ISSN: 2296-987X
eISSN: 2296-987X
DOI: https://doi.org/10.3389/fspas.2017.00061
Web address : https://www.frontiersin.org/articles/10.3389/fspas.2017.00061/full
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/31738334
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 used 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 similar to 1. Absorption systems of EW >= 0.3 associated with the foreground quasars are revealed up to 200 kpc 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. In this contribution we use 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.
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