ON THE DISAPPEARANCE OF THE BROAD-LINE REGION IN LOW-LUMINOSITY AGNs
نویسندگان
چکیده
The disk-wind scenario for the broad-line region (BLR) and toroidal obscuration in active galactic nuclei predicts the disappearance of the BLR at low luminosities. In accordance with the model predictions, data from a nearly complete sample of nearby AGNs show that the BLR disappears at luminosities lower than 5 × 10 (M/107M⊙) 2/3 erg s, where M is the black hole mass. The radiative efficiency of accretion onto the black hole is . 10 for these sources, indicating that their accretion is advection-dominated. Subject headings: accretion, accretion disks — galaxies: active — galaxies: Seyfert — quasars: general
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تاریخ انتشار 2009