Details

Autor(en) / Beteiligte

• Danforth, Charles W
• Keeney, Brian A
• Tilton, Evan M
• Shull, J Michael
• Stocke, John T
• Stevans, Matthew
• Pieri, Matthew M
• Savage, Blair D
• France, Kevin
• Syphers, David
• Smith, Britton D
• Green, James C
• Froning, Cynthia
• Penton, Steven V
• Osterman, Steven N

Titel

AN HST/COS SURVEY OF THE LOW-REDSHIFT INTERGALACTIC MEDIUM. I. SURVEY, METHODOLOGY, AND OVERALL RESULTS

Ist Teil von

• The Astrophysical journal, 2016-02, Vol.817 (2), p.111

Ort / Verlag

United Kingdom: American Astronomical Society

Erscheinungsjahr

2016

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We use high-quality, medium-resolution Hubble Space Telescope/Cosmic Origins Spectrograph (HST/COS) observations of 82 UV-bright active galactic nuclei (AGNs) at redshifts zAGN < 0.85 to construct the largest survey of the low-redshift intergalactic medium (IGM) to date: 5138 individual extragalactic absorption lines in H i and 25 different metal-ion species grouped into 2611 distinct redshift systems at zabs < 0.75 covering total redshift pathlengths ?zH i = 21.7 and zO vi = 14.5. Our semi-automated line-finding and measurement technique renders the catalog as objectively defined as possible. We find substantial clustering of H i absorbers on scales of v = 50-300 km s-1 with no significant clustering at v gsim 1000 km s-1. Splitting the sample into strong and weak absorbers, we see that most of the clustering occurs in strong, NH i gsim 1013.5 cm-2, metal-bearing IGM systems.