The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies

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

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31 Scopus citations


We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.

Original languageEnglish (US)
Pages (from-to)L43-L46
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - Jul 1 1999


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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