Catalog of narrow $CIV$ absorption lines in BOSS (I): for quasars with $z_{em}\le 2.4$

Abstract

We have assembled absorption systems by visually identifying $CIV\lambda \lambda 1548,1551$ absorption doublets in the quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS) one by one. This paper is the first of the series work. In this paper, we concern quasars with relatively low redshifts and high signal-to-noise ratios for their spectra, and hence we limit our analysis on quasars with $z_{em}\le 2.4$ and on the doublets with $W_r\lambda 1548\ge 0.2$ Å. Out of the more than 87,000 quasars in the Data Release 9, we limit our search to 10,121 quasars that have the appropriate redshifts and spectra with high enough signal-to-noise ratios to identify narrow C IV absorption lines. Among them, 5,442 quasars are detected to have at least one $CIV\lambda \lambda 1548,1551$ absorption doublet. We obtain a catalog containing 8,368 $CIV\lambda \lambda 1548,1551$ absorption systems, whose redshifts are within $z_{abs}=1.4544$ - $2.2805$. In this catalog, about $33.7\%$ absorbers have $0.2$ Å$\le W_r\lambda 1548<0.5$ Å, about $45.9\%$ absorbers have $0.5$ Å$\le W_r\lambda 1548<1.0$ Å, about $19.2\%$ absorbers have $1.0$ Å$\le W_r\lambda 1548<2.0$ Å, and about $1.2\%$ absorbers have $W_r\lambda 1548\ge 2.0$ Å.

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Cited by in corpus (5)

• Narrow absorption lines with two observations of Sloan Digital Sky Survey
• The correlated variations of C IV narrow absorption lines and quasar continuum
• Collective properties of quasar narrow associated absorption lines
• Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4
• Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey