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2019ApJS..243....2C - Astrophys. J., Suppl. Ser., 243, 2-2 (2019/July-0)

The correlated variations of absorption lines and quasar continuum.

CHEN Z.-F., YI S.-X., PANG T.-T., YI T.-F., WANG Z.-W., MO X.-H. and LIU C.-Q.

Abstract (from CDS):

Using the quasar spectra from the Sloan Digital Sky Survey and with variable C IV absorption line systems, we measure the Si IV and N V absorption line systems. We obtain 50 variable Si IV absorption line systems and 39 variable N V absorption line systems. We find that the variations in most of the C IV, Si IV, and N V absorption lines are correlated with the changes in quasar continuum. In addition, a significant portion of the variable absorption lines are the consistent variations of multiple systems with large velocity separations. Therefore, the variations of the C IV, Si IV, and N V absorption lines could be mainly driven by the changes in quasar radiations, which cause changes in ionization states or column densities of absorbing gas. We also find that the variable C IV, Si IV, and N V absorption line systems can be divided into low-ionization systems and high-ionization systems. The former positively responds to the changes in the quasar's brightness, and the later is the oppositive case.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

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

VizieR on-line data: <Available at CDS (J/ApJS/243/2): table1.dat table2.dat>

Simbad objects: 322

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