@article{oai:soar-ir.repo.nii.ac.jp:00015879, author = {Misawa, T and Eracleous, M and Charlton, JC and Kashikawa, N}, issue = {1}, journal = {The Astrophysical Journal}, month = {May}, note = {We present six new and two previously published high-resolution spectra of the quasar HS 1603+3820 (z(em) = 2: 542) taken over an interval of 4.2 yr (1.2 yr in the quasar rest frame). The observations were made with the High Dispersion Spectrograph on the Subaru telescope and the Medium Resolution Spectrograph on the Hobby-Eberly Telescope. The purpose was to study the narrow absorption lines (NALs). We use time variability and coverage fraction analysis to separate intrinsic absorption lines, which are physically related to the quasar, from intervening absorption lines. By fitting models to the line profiles, we derive the parameters of the respective absorbers as a function of time. Only the mini-BAL system at z(abs) similar to 2.43 (v(shift) similar to 9500 km s(-1)) shows both partial coverage and time variability, although two NAL systems possibly show evidence of partial coverage. We find that all the troughs of the mini-BAL system vary in concert and its total equivalent width variations resemble those of the coverage fraction. However, no other correlations are seen between the variations of different model parameters. Thus, the observed variations cannot be reproduced by a simple change of ionization state or by motion of a homogeneous parcel of gas across the cylinder of sight. We propose that the observed variations are a result of rapid continuum fluctuations, coupled with coverage fraction fluctuations caused by a clumpy screen of variable optical depth located between the continuum source and the mini-BAL gas. An alternative explanation is that the observed partial coverage signature is the result of scattering of continuum photons around the absorber, thus the equivalent width of the mini-BAL can vary as the intensity of the scattered continuum changes., Article, The Astrophysical Journal. 660:152-166 (2007)}, pages = {152--166}, title = {Results of monitoring the dramatically variable CIV mini-broad absorption line system in the quasar HS 1603+3820}, volume = {660}, year = {2007} }