Evolution of broad-line emission from active galactic nuclei

By M. Elitzur, Luis C. Ho, J. Trump. 2013

133 citations recorded by the source corpus.

Apart from viewing-dependent obscuration, intrinsic broad-line emission from active galactic nuclei (AGN) follows an evolutionary sequence: type 1 → 1.2/1.5 → 1.8/1.9 → 2a s the accretion rate on to the central black hole is decreasing. This spectral evolution is controlled, at least in part, by the parameter Lbol/M 2/3 , where Lbol is the AGN bolometric luminosity and M is the black hole mass. Both this dependence and the double-peaked profiles that emerge along the sequence arise naturally in the disc-wind scenario for the AGN broad-line region.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/40bdcb9f7304787356a86fa661e3d51caa1746b0

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In Astronomy and Astrophysics

Citations in the corpus

Discovery of 21 New Changing-look AGNs in the Northern Sky (2017, background): “An alternative scenario is that the different classes are evolutionary (Penston & Perez 1984; Korista & Goad 2004; Wang & Zhang 2007; Elitzur et al. 2014).”
A systematic search for changing-look quasars in SDSS (2015, background): “Indeed, Elitzur et al. (2014) provide a scenario where AGN evolve naturally from Type 1 to 1.2/1.5 to 1.8/1.9 as the accretion rate diminishes.”
THE DISCOVERY OF THE FIRST “CHANGING LOOK” QUASAR: NEW INSIGHTS INTO THE PHYSICS AND PHENOMENOLOGY OF ACTIVE GALACTIC NUCLEI (2014, methodology): “Continued monitoring of the source will reveal if the source transitions to a pure Type 2 state, as predicted by Elitzur et al. (2014), and when the narrow lines weaken in response to the decrease in energy output from the central engine.”
BAT AGN Spectroscopic Survey. I. Spectral Measurements, Derived Quantities, and AGN Demographics (2017, background): “In general, type 1 AGN are found to have high accretion rates, L/LEdd > 0.01 (e.g., Nicastro 2000; Yuan & Narayan 2004; Trump et al. 2011; Elitzur et al. 2014), and therefore it is quite surprising to find type 1 sources with such a low value of the Eddington ratio.”
Now You See It, Now You Don't: The Disappearing Central Engine of the Quasar J1011+5442 (2015, background): “Elitzur et al. (2014) describe an accretion-rate driven paradigm for the evolution between spectral types.”