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Date and Time of the Query: 2019-06-24 T03:27:37 PDT
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For refcode 2002ApJ...571L...1A:
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2002ApJ...571L...1A The Relation between Mid-Infrared Emission and Black Hole Mass in Active Galactic Nuclei: A Direct Way to Probe Black Hole Growth? Almudena Alonso-Herrero, Valentin D. Ivanov, Ray Jayawardhana, and Takashi Hosokawa Received 2002 March 8; accepted 2002 April 15; published 2002 April 23 ABSTRACT We use a large, heterogeneous sample of local active galactic nuclei (AGNs) that includes Seyfert 1 galaxies, Seyfert 2 galaxies, and Palomar-Green quasars to investigate for the first time the relation between black hole mass (M_BH_) and mid-infrared nuclear emission. We find a clear relation between M_BH_ and 10 micron nuclear luminosity for these local AGNs. There are no significant differences between type 1 and type 2 objects, implying that the reprocessing of the 10 micron nuclear emission is not severely affected by geometric and optical depth effects. We also confirm that M_BH_ is related to the 2-10 keV X-ray luminosity, but only for Compton-thin galaxies. We present a theoretical basis for these empirical relations and discuss possible reasons for the observed scatter. Our results show that rest-frame 10 micron and hard X-ray luminosities (especially the former, which is applicable to all AGN types) can be powerful tools for conducting a census of BH masses at high redshift and for probing their cosmological evolution. Subject headings: black hole physics - galaxies: active - galaxies: nuclei - galaxies: Seyfert - quasars: general
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