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| Paper: |
Narrow UV Absorption Line Outflows from Quasars |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
47 |
| Authors: |
Hamann, F.; Simon, L.; Hidalgo, P. R.; Capellupo, D. |
| Abstract: |
Narrow absorption line (NAL) outflows are an important yet poorly
understood part of the quasar outflow phenomenon. We discuss one
particular NAL outflow that has high speeds, time variability, and
moderate ionizations like typical BAL flows, at an estimated location
just ∼5 pc from the quasar. It also has a total column density
and line widths (internal velocity dispersions) ∼100 times
smaller than BALs, with no substantial X-ray absorption. We argue that
radiative shielding (in the form of an X-ray/warm absorber) is not
critical for the outflow acceleration and that the moderate
ionizations occur in dense substructures that have an overall small
volume filling factor in the flow. We also present new estimates of
the overall incidence of quasar outflow lines; e.g., ∼43% of
bright quasars have a C IV NAL outflow while ∼68% have a C IV
outflow line of any variety (NAL, BAL, or mini-BAL). |
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