Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4409r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #44.09; Bulletin of the American Astronomical Society, Vol. 39, p.793
Astronomy and Astrophysics
Astronomy
Scientific paper
The question of radio loudness in active galactic nuclei (AGN) has been discussed extensively in the literature recently as to whether there is an actual bimodal distribution between radio loud (RL) and radio quiet (RQ) objects when compared with Eddington ratio and identified by galaxy morphology. Using AGN spectra from the Sloan Digital Sky Survey (SDSS) Data Release 4 we can derive physical parameters like Eddington ratio and black hole mass for a large number of objects using relations between the radius of the broad line region and the luminosity of Balmer lines. This relation comes from the 35 or so previously reverberation mapped objects where virial black hole masses are directly measured from variability of emission line to continuum flux time lags. Radio fluxes from the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey coupled with SDSS data allow us to calculate the radio loudness parameter for all objects above the FIRST detection limit. The broad line AGN sample discussed here consists of 8435 objects taken from Greene & Ho (2007) of which 821 have corresponding observed radio fluxes. Using these data the question of radio bimodality is investigated. We find no clear demarcation between the RL and RQ objects as previously claimed by several investigators.
Crenshaw Michael D.
Rafter Stephen E.
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