A Link Between Feeding and Feedback in FeLoBAL Quasars
Karen Leighly
The University of Oklahoma
Broad Absorption Line (BAL) quasars show undeniable evidence for
outflows in their rest-UV spectra. Whether or not BAL outflows occur
in all quasars is important for understanding the astrophysics of the
outflows, as well as their possible role in galaxy evolution. We
report the results of an analysis of 30 low-redshift (z < 1) iron
low-ionization broad absorption line quasars (FeLoBALQs). A matched
sample of 132 unabsorbed quasars was analyzed in parallel. We found
that while unabsorbed quasars are characterized by a single-peaked
distribution in accretion rate relative to Eddington, the FeLoBAL
quasars split into two peaks: a high accretion rate branch and a low
accretion rate branch. This result strongly suggests that FeLoBAL
quasars are a special and distinct population, and it is possible that
they are key signposts of galaxy evolution. I will show preliminary
results from a complementary high-redshift sample of FeLoBALs, and I
will discuss future plans and prospects for BAL studies.
Date: | Jeudi, le 18 avril 2024 |
Heure: | 12:30 |
Lieu: | Université de Montréal |
| Pavillon MIL, salle A-3521.1 |
|