2018ApJ...864L...6P -
Astrophys. J., 864, L6-L6 (2018/September-1)
Glimmering in the dark: modeling the low-mass end of the M*-σ relation and of the quasar luminosity function.
PACUCCI F., LOEB A., MEZCUA M. and MARTIN-NAVARRO I.
Abstract (from CDS):
The M•–σ relation establishes a connection between central black holes (BHs) and their host spheroids. Supported by observations at M•≳105M☉, there is limited data on its validity at lower masses. Employing a semi-analytical model to simulate the combined evolution of BHs and their host galaxies, we predict the observational consequences of assuming a bimodality in the accretion efficiency of BHs, with low-mass BHs (M•≲105M☉) accreting inefficiently. We predict a departure from the M•–σ relation at a transitional BH mass ∼105M☉, with lower-mass BHs unable to reach the mass dictated by the relation and becoming disconnected from the evolution of the host galaxy. This prediction is an alternative to previous works suggesting a flattening of the relation at ∼105–106M☉. Furthermore, we predict a deficit of BHs shining at bolometric luminosities ∼1042ergs–1. Joined with a detection bias, this could partly explain the scarce number of intermediate-mass BHs detected. Conversely, we predict an increase in source density at lower bolometric luminosities, < 1042ergs–1. Because our predictions assume a bimodal population of high-redshift BH seeds, future observations of fainter BHs will be fundamental for constraining the nature of these seeds.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
black hole physics - dark ages, reionization, first stars - early universe - galaxies: active - galaxies: evolution - quasars: supermassive black holes
Simbad objects:
3
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