Volume 525, January 2011
|Number of page(s)||5|
|Published online||07 December 2010|
Synchrotron radio emission in radio-quiet AGNs
ISDC Data Centre for Astrophysics, ch. d’Ecogia 16,
2 Geneva Observatory, Geneva University, ch. des Maillettes 51, 1290 Sauverny, Switzerland
e-mail: Wakiko.Ishibashi@unige.ch; Thierry.Courvoisier@unige.ch
Accepted: 15 October 2010
The basic mechanism responsible for radio emission in radio-loud active galactic nuclei (AGNs) is assumed to be synchrotron radiation. We suggest here that radio emission in radio-quiet objects is also due to synchrotron radiation of particles accelerated in shocks. We consider generic shocks and study the resulting synchrotron properties. We estimate the synchrotron radio luminosity and compare it with the X-ray component produced by inverse Compton emission, and find that the radio-to-X-ray luminosity ratio is much less than unity, with values typical of radio-quiet sources. The predicted trends in source parameters, black hole mass, and accretion rate may account for the anticorrelation between radio loudness and Eddington ratio observed in different AGN samples.
Key words: accretion, accretion disks / radiation mechanisms: non-thermal / galaxies: active / radio continuum: galaxies / radiation mechanisms: thermal
© ESO, 2010
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