Type 1 AGN at low z. I. Emission properties

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We analyze the emission properties of a new sample of 3 596 type 1 AGN, selected from the SDSS DR7 based on the detection of broad Hα emission. The sample extends over a broad Hα luminosity LbHα of 1040-1044 erg s-1 and a broad Hα FWHM of 1 000-25 000 km s-1, which covers the range of black hole mass 106 < MBH/Mȯ < 109.5 and luminosity in Eddington units 10-3 < L/LEdd < 1. We combine ROSAT, GALEX and 2MASS observations to form the SED from 2.2 μm to 2 keV. We find the following: 1. The distribution of the Hα FWHM values is independent of luminosity. 2. The observed mean optical-UV SED is well matched by a fixed shape SED of luminous quasars, which scales linearly with L bHα, and a host galaxy contribution. 3. The host galaxy r-band (fibre) luminosity function follows well the luminosity function of inactive non-emission line galaxies (NEG), consistent with a fixed fraction of ∼ 3% of NEG hosting an AGN, regardless of the host luminosity. 4. The optical-UV SED of the more luminous AGN shows a small dispersion, consistent with dust reddening of a blue SED, as expected for thermal thin accretion disc emission. 5. There is a rather tight relation of νLν(2 keV) and L bHα, which provides a useful probe for unobscured (true) type 2 AGN.

Original languageEnglish
Article number012010
JournalJournal of Physics: Conference Series
StatePublished - 2012
EventAstronomy at High Angular Resolution 2011: The Central Kiloparsec in Galactic Nuclei, AHAR 2011 - Bad Honnef, Germany
Duration: 29 Aug 20112 Sep 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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