Journal
ASTRONOMICAL JOURNAL
Volume 138, Issue 6, Pages 1817-1829Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/6/1817
Keywords
galaxies: evolution; galaxies: ISM; quasars: absorption lines
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Funding
- Center for Cosmology at UC Irvine
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
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We present an initial survey of Mg II absorption characteristics in the halos of a carefully constructed, volume-limited subsample of galaxies embedded in the spectroscopic part of the Sloan Digital Sky Survey (SDSS). We observed quasars near sightlines to 20 low-redshift (z similar to 0.1), luminous (M(r) + 5logh <= -20.5) galaxies in SDSS DR4 and DR6 with the LRIS-B spectrograph on the Keck I telescope. The primary systematic criteria for the targeted galaxies are a redshift z greater than or similar to 0.1 and the presence of an appropriate bright background quasar within a projected 75 h(-1) kpc of its center, although we preferentially sample galaxies with lower impact parameters and slightly more star formation within this range. Of the observed systems, six exhibit strong (W(eq)(2796) >= 0.3 angstrom) Mg II absorption at the galaxy's redshift, six systems have upper limits which preclude strong Mg II absorption, while the remaining observations rule out very strong (W(eq)(2796) >= 1-2 angstrom) absorption. The absorbers fall at higher impact parameters than many non-absorber sightlines, indicating a covering fraction f(c) less than or similar to 0.4 for >= 0.3 angstrom absorbers at z similar to 0.1, even at impact parameters <= 35 h(-1) kpc (f(c) similar to 0.25). The data are consistent with a possible dependence of covering fraction and/or absorption halo size on the environment or star-forming properties of the central galaxy.
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