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Paper: The Role of Gas in Galaxy Evolution: New Clues from Low-Redshift O VI Quasar Absorption Systems
Volume: 240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA
Page: 557
Authors: Tripp, T. M.; Savage, B. D.; Jenkins, E. B.
Abstract: We briefly summarize some initial results of an on-going Hubble Space Telescope study of low-redshift O VI quasar absorbers. We find the following. (1) The number of O VI absorbers per unit redshift observed toward H1821+643 and PG0953+415 is remarkably high, and the O VI absorbers are likely an important baryon reservoir at low redshifts. (2) The physical conditions of the absorbers are complex, and in some cases there is clear evidence that the O VI systems are multi-phase absorbing media. (3) In some cases, very broad components are apparent in the the HI profiles, which suggests the presence of hot gas. (4) The O VI lines are located close to luminous galaxies and are intervening (as opposed to intrinsic/ejected) absorption systems.
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