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http://hdl.handle.net/20.500.12386/28159
Titolo: | Circum-galactic medium in the halo of quasars | Autori: | Ottolina, Riccardo FALOMO, Renato Treves, Aldo USLENGHI, MICHELA Kotilainen, Jari K. Scarpa, Riccardo Farina, Emanuele Paolo |
Data pubblicazione: | 2017 | Rivista: | FRONTIERS IN ASTRONOMY AND SPACE SCIENCES | Numero: | 4 | 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 <P />̊ 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. | URI: | http://hdl.handle.net/20.500.12386/28159 | URL: | https://www.frontiersin.org/articles/10.3389/fspas.2017.00061/full | ISSN: | 2296-987X | DOI: | 10.3389/fspas.2017.00061 | Bibcode ADS: | 2017FrASS...4...61O | Fulltext: | open |
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