Search for intrinsic NALs in BAL/mini-BAL quasar spectra
  Some fraction of narrow absorption lines are physically associated to the
quasar/host-galaxy materials (i.e., intrinsic NALs) like those of BALs and
mini-BALs. The relation between these three types of absorption lines has not
been understood yet, however one interpretation is that these absorption
features correspond to different inclination angles. In this study, we search
for intrinsic NALs in 11 BAL/mini-BAL quasar spectra retrieved from VLT/UVES
public archive, in order to test a possible relation of intrinsic NALs and
BALs/mini-BALs in the geometry models. We use partial coverage analysis to
separate intrinsic NALs from ones which are associated to cosmologically
intervening materials like foreground galaxies and intergalactic medium (i.e.,
intervening NALs). We identify one reliable and two possible intrinsic NAL
systems out of 36 NAL systems in 9 BAL/mini-BAL quasar spectra after removing
two quasars without clear BAL features. In spite of a small sample size, we
placed a lower limit on the fraction of BAL/mini-BAL quasars that have at least
one intrinsic C IV NAL ($\sim33^{+33}_{-18}\%$). This can be interpreted that
intrinsic NAL absorbers exist everywhere regardless of inclination angle. We
found that one of the intrinsic NAL systems detected in SDSS
J121549.80-003432.1 is located at a large radial distance of R > 130 kpc, using
a method of photoionization model with ground/excited-state lines. Considering
the wide range of intrinsic NAL absorber distribution in inclination angles and
radial distances, it suggests that origins and geometry of them are more
complicated than we expected.
