We present our latest results on the connection between accretion rate and relativistic jet power in active galactic nuclei (AGN), by using a large sample which includes mostly blazars, but contains also some radio galaxies. The jet power can be traced by γ -ray luminosity in the case of blazars, and radio luminosity for both classes. The accretion-disc luminosity is instead traced by the broad emission lines. Among blazars, we find a correlation between broad line emission and the γ -ray or radio luminosities, suggesting a direct tight connection between jet power and accretion rate. We confirm that the observational differences between blazar subclasses reflect differences in the accretion regime, but with blazars only we cannot properly access the low-accretion regime. By introducing radio galaxies, we succeed in observing the fingerprint of the transition between radiatively efficient and inefficient accretion discs in the jetted AGN family. The transition occurs at the standard critical value Ld/LEdd ~ 10-2 and it appears smooth. Below this value, the ionizing luminosity emitted by the accretion structure drops significantly

Sbarrato, T., Padovani, P., Ghisellini, G. (2014). The jet-disc connection in AGN. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 445(1), 81-92 [10.1093/mnras/stu1759].

The jet-disc connection in AGN

SBARRATO, TULLIA
Primo
;
GHISELLINI, GABRIELE
Ultimo
2014

Abstract

We present our latest results on the connection between accretion rate and relativistic jet power in active galactic nuclei (AGN), by using a large sample which includes mostly blazars, but contains also some radio galaxies. The jet power can be traced by γ -ray luminosity in the case of blazars, and radio luminosity for both classes. The accretion-disc luminosity is instead traced by the broad emission lines. Among blazars, we find a correlation between broad line emission and the γ -ray or radio luminosities, suggesting a direct tight connection between jet power and accretion rate. We confirm that the observational differences between blazar subclasses reflect differences in the accretion regime, but with blazars only we cannot properly access the low-accretion regime. By introducing radio galaxies, we succeed in observing the fingerprint of the transition between radiatively efficient and inefficient accretion discs in the jetted AGN family. The transition occurs at the standard critical value Ld/LEdd ~ 10-2 and it appears smooth. Below this value, the ionizing luminosity emitted by the accretion structure drops significantly
Articolo in rivista - Articolo scientifico
Accretion; Accretion discs; BL Lacertae objects; Gamma-rays: general; General; Quasars: general; Radiation mechanisms: non-thermal; Space and Planetary Science; Astronomy and Astrophysics
English
2014
445
1
81
92
none
Sbarrato, T., Padovani, P., Ghisellini, G. (2014). The jet-disc connection in AGN. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 445(1), 81-92 [10.1093/mnras/stu1759].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/106881
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