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On the Disappearance of the Broad-Line Region in Low-Luminosity Agns

Jul, 2009
10 pages
Published in:
  • Astrophys.J.Lett. 701 (2009) L91-L94
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Abstract: (arXiv)
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\times\E{39} (M/10^7\Mo)^{2/3} erg s$^{-1)$, where $M$ is the black hole mass. The radiative efficiency of accretion onto the black hole is $\la \E{-3}$ for these sources, indicating that their accretion is advection-dominated.
Note:
  • ApJ Letters, to be published