CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. I. QUASARS WITH z em ⩽ 2.4

We have assembled absorption systems by visually identifying C iv λλ1548, 1551 absorption doublets in the quasar spectra of the Baryon Oscillation Spectroscopic Survey one by one. This paper is the first of the series of work. In this paper, we focus on quasars with relatively low redshifts and high signal-to-noise ratio spectra, and hence we limit our analysis to quasars with z em ⩽ 2.4 and to doublets with W r λ1548 ⩾ 0.2 Å. Out of the more than 87,000 quasars in 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, 5442 quasars are detected to have at least one C iv λλ1548, 1551 absorption doublet. We obtain a catalog containing 8368 C iv λλ1548, 1551 absorption systems, whose redshifts are within z abs = 1.4544–2.2805. In this catalog, about 33.7% absorbers have 0.2 Å ⩽ W r λ1548 < 0.5 Å, about 45.9% absorbers have 0.5 Å ⩽ W r λ1548 < 1.0 Å, about 19.2% absorbers have 1.0 Å ⩽ W r λ1548 < 2.0 Å, and about 1.2% absorbers have W r λ1548 ⩾ 2.0 Å.