NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T17:53:21 PDT
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For refcode 2017ApJ...835..236S:
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2017ApJ...835..236S Double-Peaked Profiles: Ubiquitous Signatures of Disks in the Broad Emission Lines of Active Galactic Nuclei Storchi-Bergmann, T.; Schimoia, J. S.; Peterson, B. M.; Elvis, M.; Denney, K. D.; Eracleous, M.; Nemmen, R. S. Abstract. Broad (~10,000 km s^-1^), double-peaked emission-line profiles of Balmer lines emitted by active galactic nuclei (AGN) are thought to originate in the outer parts of an accretion disk surrounding a nuclear supermassive black hole (SMBH), at ~1000 gravitational radii, and are most frequently observed in the nuclear spectra of low-luminosity AGN (LLAGN) and radio galaxies. In the present paper we argue that broad double-peaked profiles are present also in the spectra of other type 1 AGN, such as Seyfert 1 galaxies, suggesting that the inner part of the broad-line region (BLR) is also the outer part of the accretion disk. We use the Palomar spectral survey of nearby galaxies to show that the only difference between Seyfert 1 BLR line profiles and "bona fide" double-peakers is that, in most cases, besides a disk component, we need an additional Gaussian component attributed to nondisk clouds. The recognition that the inner and most variable part of the BLR has a disk geometry suggests that the factor f in the expression to obtain the SMBH mass in type 1 AGN, {M}_{BH_}=f({R}_{BLR_}{{Delta}}{V}^2^/G), is f=1/{\sin}^2^i for the disk-dominated sources. Our median i = 27^degree^ implies f = 4.5, very close to the most recent value of f = 4.3 +/- 1.05, obtained from independent studies. We derive a relation between f and the FWHM of the broad profile that may help to reduce the uncertainties in the SMBH mass determinations of AGN. Key words: accretion, accretion disks, galaxies: active, galaxies: nuclei, galaxies: Seyfert, line: profiles
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