Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf...25f&link_type=abstract
CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
A small fraction of active galactic nuclei (AGN) emit powerful radio waves from component structures (cores, jets, lobes) with sizes ranging from pc to Mpc. The ultimate power source of these radio-loud AGN (RLAGN) is most probably the gravitational accretion of galactic stars, dust and gas onto central massive black holes (MBHs) imprisoning 106M&sun; to 1010M&sun; such objects are now believed to naturally form in galactic centers during their dynamical evolution. It should be possible to investigate the cosmological behaviour of RLAGN, and of their resident MBHs, by comparing global Monte-Carlo population models with the many publicly available radio catalogs and imaging databases. A simple model is applied to the jet angular size distribution of ~ 4 × 103 RLAGN imaged in the 19-year, MITVLA gravitational lens snapshot survey; if these distant kpc-scale jets are powered by Eddington-accreting MBHs, a statistical upper limit (v/c<~0.1) can be set on their head propagation speeds. This is a small, first step in the confrontation of statistically large RLAGN sample observations with the theory of their central MBH engines. The time evolution of accreting Kerr MBHs is briefly addressed, and a simple model is sketched for cosmologically evolving MBHs in radio-loud AGN.
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