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The jet–disc connection in AGN

Published online by Cambridge University Press:  24 March 2015

Tullia Sbarrato ,
Paolo Padovani  and
Gabriele Ghisellini
Tullia Sbarrato
Affiliation:
INAF – Osservatorio Astronomico di Brera, Via Bianchi 46, I–23807 Merate, Italy email: tullia.sbarrato@brera.inaf.it Università dell'Insubria, Dipartimento di Scienza e Alta Tecnologia, Via Valleggio 11, I–22100 Como, Italy
Paolo Padovani
Affiliation:
ESO – European Southern Observatory, Karl–Schwarzschild–Strasse 2, D–85748 Garching bei München, Germany
Gabriele Ghisellini
Affiliation:
INAF – Osservatorio Astronomico di Brera, Via Bianchi 46, I–23807 Merate, Italy email: tullia.sbarrato@brera.inaf.it
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Abstract

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We present our latest results on the connection between the accretion rate and the power of relativistic jets. To this aim we use blazars, whose jet is pointing at us, with visible broad emission lines, along with broad lineless radio–galaxies. We trace the jet power with two proxies (gamma–ray and radio luminosities), while the broad emission lines are a direct measure of the accretion disc luminosity. We find a correlation between the broad emission line and the gamma–ray or luminosities in blazars, suggesting a direct tight connection between the jet and the accretion rate. Only extending our analysis to radio–galaxies, and using as jet tracer the radio luminosity, we are finally able to conclude that jetted AGN can accrete both through a radiatively efficient accretion disc and a hot accretion flow, depending on the accretion rate. We finally observe the transition between the two states among the family of jetted AGN.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 48 - 52
Copyright
Copyright © International Astronomical Union 2015 

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