Low- and high-ionization absorption properties of Mg II absorption-selected galaxies at intermediate redshifts. I. General properties

Christopher W. Churchill, Richard R. Mellon, Jane C. Charlton, Buell T. Jannuzi, Sofia Kirhakos, Charles C. Steidel, Donald P. Schneider

Research output: Contribution to journalArticle

91 Scopus citations


We present extensive metal-line absorption properties for 45 absorption systems that were selected by their Mg II absorption at redshifts between 0.4 and 1.4. For each system the properties of several chemical species are determined, including a wide range of ionization conditions. In the optical, the absorption systems have been observed at ∼6 km s-1 resolution with HIRES/Keck, which covered Mg II, several Fe II transitions, Mg I, and in some cases (depending upon redshift) Ca II, Ti II, Mn II, and Al III. Ultraviolet, lower resolution (∼230 km s-1) Faint Object Spectrograph data (1600-3275 Å) were obtained from the Hubble Space Telescope archive. These spectra covered Al II, Al III, Si II, Si III, Si IV, C II, C III, C IV, N V, O VI, and several Lyman series transitions, with coverage dependent upon the absorption system redshift. From these data, we infer that Mg II-absorbing galaxies at intermediate redshifts have multiphase gaseous structures.

Original languageEnglish (US)
Pages (from-to)91-119
Number of pages29
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Sep 1 2000
Externally publishedYes



  • Galaxies: evolution
  • Galaxies: halos
  • Quasars: absorption lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this