Partially obscured quasars in the Sloan Digital Sky Survey Early Data Release

Details Partially obscured quasars in the Sloan Digital Sky Survey Early Data Release Partially obscured quasars in the Sloan Digital Sky Survey Early Data Release

2004-11-07

arxiv.org/abs/astro-ph/0411171v1

Astrophys.J.620:629-645,2005; Erratum-ibid.703:2291,2009

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ

Scientific paper

10.1086/427174 10.1088/0004-637X

We have compiled a sample of 21 low redshift (z < 0.3), luminous active galactic nuclei (AGN) with large Balmer decrements (Halpha/Hbeta > 7) using the galaxy and QSO catalogs of the Sloan Digital Sky Survey Early Data Release. Using this sample we attempt to determine the fraction of quasars with large internal absorption. We find that these AGN have Strong [O III] and broad Halpha emission, and that starlight dominates the spectra in the blue band, suggesting that these objects are heavily reddened. Their narrow emission line ratios are similar to those of Seyfert 2 galaxies, yet the average [O III]5007 emission is ~10 times more luminous. Applying the empirical relation between the optical continuum and the Balmer line luminosity for blue quasars, we find that the intrinsic luminosities of these 21 objects are in the range for quasars. We propose that they are obscured, intermediate type quasars analogous to type 1.8 and 1.9 Seyfert galaxies. The ratio of these optically selected, intermediate type quasars to type 1 quasars are found to be around 1, similar to that for local Seyfert galaxies. Preliminary study indicates that most of these quasars are hosted in early type galaxies.

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