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• W2011019871 abstract "We describe an alternate way to estimate Broad Line Region (BLR) radii for type-1 AGN based on determination of physical conditions in the BLR under the assumption that the line emitting gas is photoionized by a central continuum source. We derive “diagnostic” intensity ratios involving UV lines Aliii λ1860, Siiii]λ1892 and Civλ1549 which enable us to compute the ionizing photon flux, and hence BLR radius from the ionization parameter definition. We compare our estimates of BLR radii with values independently obtained from reverberation monitoring of Hβ and, in a few cases, of C ivλ1549. We analyze the interpretation of the photoionization estimates in the 4D eigenvector 1 context, and discuss in some detail the case of 3C 390.3. For this object we are able to provide not only the ionizing photon flux, but also an estimate of density and ionization parameter from the measured diagnostic ratios. We also compare black hole masses obtained from this method with values derived from widely-applied correlations between mass, line broadening and luminosity. Good agreement is found for both radius and black hole mass comparisons." @default.
• W2011019871 created "2016-06-24" @default.
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• W2011019871 date "2014-10-01" @default.
• W2011019871 modified "2023-10-18" @default.
• W2011019871 title "A photoionization method for estimating BLR “size” in quasars" @default.
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• W2011019871 doi "https://doi.org/10.1016/j.asr.2013.11.037" @default.
• W2011019871 hasPublicationYear "2014" @default.
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