期刊
ASTRONOMICAL JOURNAL
卷 141, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/141/4/137
关键词
galaxies: ISM; quasars: absorption lines
资金
- Marshall Scholarship
- National Science Foundation [AST-0307743, PHY-0244105]
- University of Pittsburgh
- STFC
- Alfred P. Sloan Foundation
- NASA
- DOE
- Japanese Monbukagakusho
- Max-Planck Society
We present a catalog of intervening Mg II quasar absorption-line systems in the redshift interval 0.36 <= z <= 2.28. The catalog was built from Sloan Digital Sky Survey Data Release Four (SDSS DR4) quasar spectra. Currently, the catalog contains similar to 17,000 measured Mg II doublets. We also present data on the similar to 44,600 quasar spectra which were searched to construct the catalog, including redshift and magnitude information, continuum-normalized spectra, and corresponding arrays of redshift-dependent minimum rest equivalent widths detectable at our confidence threshold. The catalog is available online. A careful second search of 500 random spectra indicated that, for every 100 spectra searched, approximately one significant Mg II system was accidentally rejected. Current plans to expand the catalog beyond DR4 quasars are discussed. Many Mg II absorbers are known to be associated with galaxies. Therefore, the combination of large size and well understood statistics makes this catalog ideal for precision studies of the low-ionization and neutral gas regions associated with galaxies at low to moderate redshift. An analysis of the statistics of Mg II absorbers using this catalog will be presented in a subsequent paper.
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