Circum-Galactic Medium in the Halo of Quasars
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...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2017-12-01
|
| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/article/10.3389/fspas.2017.00061/full |
| _version_ | 1828761436165242880 |
|---|---|
| author | Riccardo Ottolina Renato Falomo Aldo Treves Michela Uslenghi Jari K. Kotilainen Riccardo Scarpa Emanuele Paolo Farina |
| author_facet | Riccardo Ottolina Renato Falomo Aldo Treves Michela Uslenghi Jari K. Kotilainen Riccardo Scarpa Emanuele Paolo Farina |
| author_sort | Riccardo Ottolina |
| collection | DOAJ |
| description | 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 ~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. |
| first_indexed | 2024-12-11T01:30:06Z |
| format | Article |
| id | doaj.art-c1d0249507c84e2f89cc820c40e863aa |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-12-11T01:30:06Z |
| publishDate | 2017-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-c1d0249507c84e2f89cc820c40e863aa2022-12-22T01:25:24ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2017-12-01410.3389/fspas.2017.00061314920Circum-Galactic Medium in the Halo of QuasarsRiccardo Ottolina0Renato Falomo1Aldo Treves2Michela Uslenghi3Jari K. Kotilainen4Riccardo Scarpa5Emanuele Paolo Farina6Dipartimento di Scienza e Alta Tecnologia (DISAT), Università degli Studi dell'Insubria, Como, ItalyOsservatorio Astronomico di Padova (INAF), Padua, ItalyDipartimento di Scienza e Alta Tecnologia (DISAT), Università degli Studi dell'Insubria, Como, ItalyIstituto di Astrofisica Spaziale e Fisica Cosmica di Milano (INAF), Milan, ItalyFinnish Centre for Astronomy with ESO (FINCA), University of Turku, Turku, FinlandInstituto de Astrofisica de Canarias, La Laguna, SpainMax-Planck-Institut für Astronomie, Heidelberg, GermanyThe 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 ~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.http://journal.frontiersin.org/article/10.3389/fspas.2017.00061/fullquasarquasar environmentquasar pairquasar spectragalaxy around quasar |
| spellingShingle | Riccardo Ottolina Renato Falomo Aldo Treves Michela Uslenghi Jari K. Kotilainen Riccardo Scarpa Emanuele Paolo Farina Circum-Galactic Medium in the Halo of Quasars Frontiers in Astronomy and Space Sciences quasar quasar environment quasar pair quasar spectra galaxy around quasar |
| title | Circum-Galactic Medium in the Halo of Quasars |
| title_full | Circum-Galactic Medium in the Halo of Quasars |
| title_fullStr | Circum-Galactic Medium in the Halo of Quasars |
| title_full_unstemmed | Circum-Galactic Medium in the Halo of Quasars |
| title_short | Circum-Galactic Medium in the Halo of Quasars |
| title_sort | circum galactic medium in the halo of quasars |
| topic | quasar quasar environment quasar pair quasar spectra galaxy around quasar |
| url | http://journal.frontiersin.org/article/10.3389/fspas.2017.00061/full |
| work_keys_str_mv | AT riccardoottolina circumgalacticmediuminthehaloofquasars AT renatofalomo circumgalacticmediuminthehaloofquasars AT aldotreves circumgalacticmediuminthehaloofquasars AT michelauslenghi circumgalacticmediuminthehaloofquasars AT jarikkotilainen circumgalacticmediuminthehaloofquasars AT riccardoscarpa circumgalacticmediuminthehaloofquasars AT emanuelepaolofarina circumgalacticmediuminthehaloofquasars |