Kinematic Linkage between the Broad- and Narrow-Line-emitting Gas in Active Galactic Nuclei
Abstract
We investigate the radial velocity difference between the [O III] λλ4959, 5007 and Hβ lines for a sample of ~200 low-redshift active galactic nuclei. We identify seven objects showing an [O III] λ5007 blueshift relative to Hβ with an amplitude larger than 250 km s-1 (``blue outliers''). These line shifts are found in sources where the broad high-ionization lines (e.g., C IV λ1549) also show a large systematic blueshift. Such blueshifts occur only in the population A region of the Eigenvector 1 parameter domain (that also contains narrow-line Seyfert 1 galaxies). We suggest that [O III] λλ4959, 5007 blueshifts are also associated with the high-ionization outflow originating in these highly accreting sources. This is a direct kinematic linkage between narrow- and broad-line-emitting gas. Based in part on data collected at ESO, La Silla.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2002
- DOI:
- 10.1086/342783
- arXiv:
- arXiv:astro-ph/0207387
- Bibcode:
- 2002ApJ...576L...9Z
- Keywords:
-
- Galaxies: Active;
- Galaxies: Quasars: Emission Lines;
- Galaxies: Quasars: General;
- Astrophysics
- E-Print:
- accepted for publication by ApJ Lett