CIV NAL systems from SDSS-DR14 quasar spectra : J/ApJS/239/23


Authors : Chen Z.-F. orcid , Yao M., Pang T.-T. (hide) , Yao M., Pang T.-T. et..al

Bibcode : 2018ApJS..239...23C (ADS) (Simbad) (Objects) (hide)

CDS Keywords : QSOs; Spectra, optical; Equivalent widths; Redshifts
UAT : Quasars, Optical astronomy, Spectroscopy, Line intensities, Redshifted

Observation (OC)

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Inserted into VizieR : 04-Feb-2020
Last modification : 05-Feb-2020

Narrow C IV absorption lines with multi-epoch observations. (2018)

Keywords : catalogs ; galaxies halos ; quasars: absorption lines ; quasars: general

Abstract:Using the quasar spectra from the Sloan Digital Sky Survey, all with two-epoch to six-epoch observations, we search for CIV{lambda}{lambda}1548,1551 narrow absorption doublets in spectral data from the blue wing {upsilon}r=30000km/s until the red wing of CIV{lambda}1549 emission lines. We have obtained 21239 CIV narrow absorption line (NAL) systems, of which 647 systems were significantly changed on timescales from {Delta}MJD=0.24 to 1842.38 days at rest-frame. Both samples of the C IV NAL systems with multi-epoch observations and the variable C IV NAL systems are the largest ones to date. The offset velocity distribution of the variable C IV NALs from quasars has a peak at {upsilon}r~2000km/s and gently extends to a ...(more)
Abstract: (hide)

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