Isotropic Luminosity Indicators in a Complete AGN Sample

Details Isotropic Luminosity Indicators in a Complete AGN Sample Isotropic Luminosity Indicators in a Complete AGN Sample

2009-04-01

arxiv.org/abs/0904.0250v2

Astrophys.J.698:623-631,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Updated to match version published in ApJ. 9 pages, 4 figures

Scientific paper

10.1088/0004-637X/698/1/623

The [O IV] 25.89 micron line has been shown to be an accurate indicator of active galactic nucleus (AGN) intrinsic luminosity in that it correlates well with hard (10-200 keV) X-ray emission. We present measurements of [O IV] for 89 Seyfert galaxies from the unbiased Revised Shapley-Ames (RSA) sample. The [O IV] luminosity distributions of obscured and unobscured Seyferts are indistinguishable, indicating that their intrinsic AGN luminosities are quite similar and that the RSA sample is well suited for tests of the unified model. In addition, we analyze several commonly used proxies for AGN luminosity, including [O III] 5007 A, 6 cm radio, and 2-10 keV X-ray emission. We find that the radio luminosity distributions of obscured and unobscured AGNs show no significant difference, indicating that radio luminosity is a useful isotropic luminosity indicator. However, the observed [O III] and 2-10 keV luminosities are systematically smaller for obscured Seyferts, indicating that they are not emitted isotropically.

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