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2016MNRAS.462.2980C - Mon. Not. R. Astron. Soc., 462, 2980-2989 (2016/November-1)

Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey.

CHEN Z.-F., GU Q.-S., ZHOU L. and CHEN Y.-M.

Abstract (from CDS):

In this paper, we extend our work of IV λλ1548,1551 narrow absorption lines (NALs) with zabs ≪ zem on quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS) to collect C IV NALs with zabs ≃ zem from blue to red wings of C IV λ1549 emission lines. Together with IV NALs with 1.4544 <= zabs <= 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 (zabs ≃ zem) seem to have larger absorption strengths when compared to intervening ones (zabs ≪ zem). 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.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - quasars: absorption lines - quasars: general - quasars: general

VizieR on-line data: <Available at CDS (J/MNRAS/462/2980): table1.dat>

Simbad objects: 23508

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