SIMBAD references

As the second work in a series of papers aiming to detect absorption systems in the quasar spectra of the Baryon Oscillation Spectroscopic Survey, we continue the analysis of Paper I by expanding the quasar sample to those quasars with z_em> 2.4. This yields a sample of 21,963 appropriate quasars to search for narrow C IV λλ1548, 1551 absorptions with W_r ≥ 0.2 Å for both lines. There are 9708 quasars with at least one appropriate absorption system imprinted on their spectra. From these spectra, we detect 13,919 narrow C IV absorption systems whose absorption redshifts cover a range of z_abs= 1.8784-4.3704. In this paper and Paper I, we have selected 37,241 appropriate quasars with median S/N ≥ 4 and 1.54 ≲ z_em ≲ 5.16 to visually analyze narrow C IV λλ1548, 1551 absorption doublets one by one. A total of 15,999 quasars are found to have at least one appropriate absorption system imprinted on their spectra. From these 15,999 quasar spectra, we have detected 23,336 appropriate C IV λλ1548, 1551 absorption systems with W_r ≥ 0.2 Å whose absorption redshifts cover a range of z_abs= 1.4544-4.3704. The largest values of W_r are 3.19 Å for the λ1548 absorption line and 2.93 Å for the λ1551 absorption line, respectively. We find that only a few absorbers show large values of W_r. About 1.1% of the total absorbers have W_rλ1548 ≥ 2.0 Å.