NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-21 T07:28:53 PDT
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For refcode 2012ApJ...757..181S:
Retrieve 68 NED objects in this reference.
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2012ApJ...757..181S Contribution of the Accretion Disk, Hot Corona, and Obscuring Torus to the Luminosity of Seyfert Galaxies: INTEGRAL and Spitzer Observations Sazonov, S.; Willner, S. P.; Goulding, A. D.; Hickox, R. C.; Gorjian, V.; Werner, M. W.; Churazov, E.; Krivonos, R.; Revnivtsev, M.; Sunyaev, R.; Jones, C.; Murray, S. S.; Vikhlinin, A.; Fabian, A. C.; Forman, W. R. Abstract. We estimate the relative contributions of the supermassive black hole (SMBH) accretion disk, corona, and obscuring torus to the bolometric luminosity of Seyfert galaxies, using Spitzer mid-infrared (MIR) observations of a complete sample of 68 nearby active galactic nuclei (AGNs) from the INTEGRAL all-sky hard X-ray (HX) survey. This is the first HX-selected (above 15 keV) sample of AGNs with complementary high angular resolution, high signal-to-noise, MIR data. Correcting for the host galaxy contribution, we find a correlation between HX and MIR luminosities: L_15 micron_vpropL^0.74 +/- 0.06^_HX_. Assuming that the observed MIR emission is radiation from an accretion disk reprocessed in a surrounding dusty torus that subtends a solid angle decreasing with increasing luminosity (as inferred from the declining fraction of obscured AGNs), the intrinsic disk luminosity, L_Disk_, is approximately proportional to the luminosity of the corona in the 2-300 keV energy band, L_Corona_, with the L_Disk_/L_Corona_ ratio varying by a factor of 2.1 around a mean value of 1.6. This ratio is a factor of ~2 smaller than for typical quasars producing the cosmic X-ray background. Therefore, over three orders of magnitude in luminosity, HX radiation carries a large, and roughly comparable, fraction of the bolometric output of AGNs. We estimate the cumulative bolometric luminosity density of local AGNs at ~(1-3) x 10^40^ erg s^-1^ Mpc^-3^. Finally, the Compton temperature ranges between kT_c_ ~ 2 and ~6 keV for nearby AGNs, compared to kT_c_ ~ 2 keV for typical quasars, confirming that radiative heating of interstellar gas can play an important role in regulating SMBH growth. Key words: accretion, accretion disks, black hole physics, galaxies: active, galaxies: Seyfert, infrared: galaxies, X-rays: galaxies
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