Conditions in the Z = 0.692 absorber toward 3CR 286

Details Conditions in the Z = 0.692 absorber toward 3CR 286 Conditions in the Z = 0.692 absorber toward 3CR 286

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..453c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 2, p. 453-457

Astronomy and Astrophysics

Astronomy

20

Absorption Spectra, H I Regions, Interstellar Matter, Quasars, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Visible Spectrum, Astronomical Interferometry, Galactic Evolution, Hubble Space Telescope, Lyman Alpha Radiation, Spectrographs, Spiral Galaxies, Very Long Base Interferometry

Scientific paper

We present Hubble Space Telescope/Faint Object Spectrograph (HST/FOS) ultraviolet and ground-based optical spectra of the z = 0.692 21 cm absorption system in the quasi-stellar object (QSO) 3CR 286. The strength of the damped Lyman-alpha absorption implies an H I column density, N(H I) approximately 2 x 1021/sq cm. We derive a high spin temperature for the H I gas, Ts greater than or approximately equal to 103 K, as has been found for other high-redshift 21 cm absorbing systems; at least 80% of the H I is hotter than 1200 K. Curve-of-growth analysis yields Mg(+) and Fe(+) abundances which are approximately 1-2 dex below solar values; the Ca(+) abundance is even lower implying some depletion onto dust grains. The H2 fraction is not high. We speculate that the high inferred Ts for the gas may reflect continuing active star formation at the 5-8 Gyr look-back time to the absorbing galaxy.

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