ON THE DISAPPEARANCE OF THE BROAD-LINE REGION IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI
By M. Elitzur, Luis C. Ho. 2009
141 citations recorded by the source corpus.
The disk-wind scenario for the broad-line region (BLR) and toroidal obscuration in active galactic nuclei (AGNs) 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 × 1039(M/107 M☉)2/3 ergs-1, where M is the black hole mass. The radiative efficiency of accretion onto the black hole is ≲10-3 for these sources, indicating that their accretion is advection-dominated.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/170482e0339df2fdf163167b5d96acd541bcda7c
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In Astronomy and Astrophysics
Citations in the corpus
- The incidence of obscuration in active galactic nuclei (2013, background): “…physical conditions in the accretion disc and its associated outflows are not favourable for the generation of a broad-line region (Nicastro 2000; Elitzur & Ho 2009); (ii) these weak type-1 AGN are simply outshone by the stellar light from the massive host galaxy they live in, especially at the…”
- First X-ray-based statistical tests for clumpy-torus models: eclipse events from 230 years of monitoring of Seyfert AGN (2014, background): “We need more sustained monitoring of Seyferts spanning a wide range of luminosities, including in the lowluminosity regime, to test the suggestion that the disk wind/torus cloud outflow disappears at low luminosities (Elitzur & Ho 2009).”
- DWARF GALAXIES WITH OPTICAL SIGNATURES OF ACTIVE MASSIVE BLACK HOLES (2013, background): “There is also the possibility that the broad-line region disappears altogether below some critical luminosity or Eddington ratio (e.g., Nicastro 2000; Laor 2003; Elitzur & Ho 2009; Trump et al. 2011; Marinucci et al. 2012).”
- OBSCURATION-DEPENDENT EVOLUTION OF ACTIVE GALACTIC NUCLEI (2015, methodology): “The low-luminosity increase of the obscured fraction has been observed before in local samples (Burlon et al. 2011; Brightman & Nandra 2011b; Elitzur & Ho 2009).”
- THREE-YEAR SWIFT–BAT SURVEY OF ACTIVE GALACTIC NUCLEI: RECONCILING THEORY AND OBSERVATIONS? (2010, methodology): “In the framework proposed by Elitzur & Shlosman (2006) and Elitzur & Ho (2009) the cloud mass outflow Ṁcl is proportional to the mass accretion rate, which is related to the bolometric luminosity via Ṁacc = 0.02L45/ηM yr−1, η being the accretion efficiency.”
- Revisiting the Unified Model of Active Galactic Nuclei (2015, background): “Elitzur & Ho (2009) followed the ideas developed in Elitzur & Shlosman (2006) and considered the clumpy dust-free BLR, and the clumpy dusty torus, as one entity made of clouds lifted along magnetic field lines from the surface of the disk.”
- Evolution of broad-line emission from active galactic nuclei (2013, background): “Further decrease of the accretion rate triggers the mass conservation limit found in Elitzur & Ho (2009), broad-line emission disappears and the AGN becomes a true type 2.”