SIMBAD references

In this paper, we extend our work of IV λλ1548,1551 narrow absorption lines (NALs) with z_abs ≪ z_em on quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS) to collect C IV NALs with z_abs ≃ z_em from blue to red wings of C IV λ1549 emission lines. Together with IV NALs with 1.4544 <= z_abs <= 4.9224 in surveyed spectral region redward of Lyα until red wing of C IV λ1549 emission line. We find that the stronger C IV NALs tend to be the more saturated absorptions, and associated systems (z_abs ≃ z_em) seem to have larger absorption strengths when compared to intervening ones (z_abs ≪ z_em). The redshift density evolution behaviour of absorbers (the number of absorbers per redshift path) is similar to the history of the cosmic star formation. When compared to the quasar-frame velocity (β) distribution of Mg II absorbers, the β distribution of C IV absorbers is broader at β ≃ 0, shows longer extended tail, and exhibits a larger dispersion for environmental absorptions. In addition, for associated C IV absorbers, we find that low-luminosity quasars seem to exhibit smaller β and stronger absorptions when compared to high-luminosity quasars.