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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
Astrophysical journal/The Astrophysical journal, 02/2016, Letnik: 817, Številka: 2Journal Article
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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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