Disappearance of a narrow Mg II absorption system with a measured velocity up to $166,000km{\mathrm{s}}^{-1}$

Abstract

Quasar J152645.61+193006.7 ($z_{\mathrm{e}}=2.5771$) was observed by the Sloan Digital Sky Survey (SDSS) on 2006 May 31, and again on 2011 April 9. The time interval of the SDSS two observations is 497.4 days at the quasar rest frame. From the spectra of this quasar, we detect a phenomenon of disappearance of a narrow $\mathrm{MgII}\lambda \lambda 2796,2803$ absorption system with a velocity up to $166,129km{\mathrm{s}}^{-1}$ with respect to the quasar. This disappearance event can be caused by changes in the ionization state of absorbing gas or by the bulk motion of the absorbing gas across the quasar sightline. The coverage fraction analysis shows that this absorber partially covers the background emission sources with an effective coverage fraction of $C_{\mathrm{f}}=0.40\pm 0.06$. The time variation analysis and the coverage fraction analysis imply that this absorber might be intrinsic to the quasar. However, the scenario of a cosmologically separated foreground object located at $z=0.9170$ accounting for the phenomenon cannot be ruled out according to current available data.

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Cited by in corpus (6)

• Monitoring the Variability of Intrinsic Absorption Lines in Quasar Spectra
• Narrow absorption lines with two observations of Sloan Digital Sky Survey
• The correlated variations of C IV narrow absorption lines and quasar continuum
• Collective properties of quasar narrow associated absorption lines
• Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
• The Detection Rate of Associated \mgii\ Absorption Lines in Quasars Depends on Their Radio Emission