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2002ApJ...569..641L - Astrophys. J., 569, 641-654 (2002/April-3)

The luminosity dependence of ultraviolet absorption in active galactic nuclei.

LAOR A. and BRANDT W.N.

Abstract (from CDS):

We describe the results of a survey of the UV absorption properties of the Boroson & Green sample of active galactic nuclei (AGNs), which extends from the Seyfert (MV≃-21) to the luminous quasar (MV≃-27) level. The survey is based mostly on Hubble Space Telescope archival data available for ≳(1)/(2) of the 87 sample objects. Our main result is that soft X-ray-weak quasars (SXWQs; 10 AGNs with αox≤-2) show the strongest UV absorption at a given luminosity, and their maximum outflow velocity, vmax, is strongly correlated with MV (rS=-0.95). This suggests that vmax is largely set by the luminosity, as expected for radiation pressure-driven outflows. Luminous SXWQs have preferentially low [O III] luminosity, which suggests that they are physically distinct from unabsorbed AGNs, while non-SXWQs with UV absorption are consistent with being drawn from the unabsorbed AGN population. We also find an indication that vmax/vBLR increases with L/LEdd, as expected for radiation pressure-driven outflows. This relation and the vmax versus MV relation may indicate that the radiation-pressure force multiplier increases with luminosity and that the wind-launching radius in non-SXWQs is ∼10 times larger than in SXWQs.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Quasars: Absorption Lines - X-Rays: Galaxies

CDS comments: PG 1116+214 = PG 1116+216.

Simbad objects: 56

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2021.04.10-22:14:52

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