期刊
ASTROPHYSICAL JOURNAL
卷 757, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/757/2/181
关键词
accretion, accretion disks; black hole physics; galaxies: active; galaxies: Seyfert; infrared: galaxies; X-rays: galaxies
资金
- Russian Academy of Sciences [P-21, OFN-16]
- Scientific and educational personnel of the innovative Russia [2012-1.2.2-12-000-1012-023]
- Dynasty Foundation
- NASA
- [RFBR 09-02-00867]
- [RFBR 11-02-12271-ofi-m]
- [NSh-5603.2012.2]
- STFC [ST/J001538/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001538/1, ST/H00243X/1] Funding Source: researchfish
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 mu m alpha L-HX(0.74 +/- 0.06). 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 similar to 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 similar to(1-3) x 10(40) erg s(-1) Mpc(-3). Finally, the Compton temperature ranges between kT(c) approximate to 2 and approximate to 6 keV for nearby AGNs, compared to kT(c) approximate to 2 keV for typical quasars, confirming that radiative heating of interstellar gas can play an important role in regulating SMBH growth.
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