NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-21 T12:49:00 PDT
Help | Comment | NED Home

For refcode 2012ApJ...759..112T:
Retrieve 44 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...759..112T The Low-redshift Intergalactic Medium as Seen in Archival Legacy HST/STIS and FUSE Data Tilton, Evan M.; Danforth, Charles W.; Shull, J. Michael; Ross, Teresa L. Abstract. We present a comprehensive catalog of ultraviolet (HST/STIS and FUSE) absorbers in the low-redshift intergalactic medium (IGM) at z < 0.4. The catalog draws from much of the extensive literature on IGM absorption and reconciles discrepancies among several previous catalogs through a critical evaluation of all reported absorption features in light of new HST/COS data. We report on 746 H I absorbers down to a rest-frame equivalent width of 12 mA over a maximum redshift path length Deltaz = 5.38. We also confirm 111 O VI absorbers, 29 C IV absorbers, and numerous absorption lines due to other metal ions. We characterize the bivariate distribution of absorbers in redshift and column density as a power law, ({partial differential} ^2 {N}/{partial differential} z{partial differential} N) is proportional to N^{-{beta}}, where beta = 2.08 +/- 0.12 for O VI and beta = 1.68 +/- 0.03 for H I. Utilizing a more sophisticated accounting technique than past work, our catalog accounts for ~43% of the baryons: 24% +/- 2% in the photoionized Ly-{alpha} forest and 19% +/- 2% in the warm-hot IGM as traced by O VI. We discuss the large systematic effects of various assumed metallicities and ionization states on these calculations, and we implement recent simulation results in our estimates. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Key words: cosmological parameters, cosmology: observations, intergalactic medium, quasars: absorption lines, ultraviolet: general
Retrieve 44 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home