Monitoring of a Dramatically Variable C IV Mini-BAL in the Quasar HS1603+3820

Details Monitoring of a Dramatically Variable C IV Mini-BAL in the Quasar HS1603+3820 Monitoring of a Dramatically Variable C IV Mini-BAL in the Quasar HS1603+3820

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910903m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #109.03; Bulletin of the American Astronomical Society,

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We present eight high-resolution spectra of an optically bright quasar, HS1603+3820 (z_em=2.542), taken over an interval of 4.2 years (1.2 years in the quasar rest frame) with Subaru Telescope and Hobby-Eberly Telescope, for the purpose of monitoring absorption lines that are physically associated to the quasar. Among eight C IV absorption systems in this quasar spectrum, only one mini-BAL system at z_abs 2.43, which was already identified as an intrinsic system based on partial coverage analysis (Misawa et al. 2003,2005), showed dramatic time variability. We fitted Voigt profiles to the mini-BAL, and found that there were no clear correlations between the fit parameters such as the column density, Doppler parameter, and coverage fraction. This result suggests that the mini-BAL absorber has an inhomogeneous internal structure. Another important observational clue is that all absorption components in the system varied in concert, which suggests the observed time variability was due to a change of the ionization conditions (not due to the gas motion) in the mini-BAL absorber. Because such rapid UV continuum variability is not expected in luminous quasars such as our target, we suggest that a variable screen of material between the quasar continuum source and the absorber is the cause of the changes in the ionization state
of the mini-BAL system. We acknowledge support from NASA grant NAG5-10817.

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