AUTHOR=Erakuman Damla , Filiz Ak Nurten 

TITLE=Rapid BAL Variability: Re-Emerging Absorption

JOURNAL=Frontiers in Astronomy and Space Sciences

VOLUME=Volume 4 - 2017

YEAR=2017

URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2017.00036

DOI=10.3389/fspas.2017.00036

ISSN=2296-987X

ABSTRACT=We study BAL variations of SDSS~J141955.28+522741.4 utilizing 32 epochs of  spectroscopic observations from SDSS. We identify three individual BAL troughs for CIV and one BAL trough for SiIV. The deepest CIV BAL trough show significant EW variations in timescales of a few ten hours. The fast component of the deepest CIV BAL present disappearance and re-emergence preserving its initial velocity range and profile. All identified BAL roughs show coordinated variations supporting that the possible mechanism behind these BAL variations likely to be ionization level changes of absorbing gas.