The Accretion Geometry in Radio-Loud Active Galaxies

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dc.creatorBallantyne, D. R.
dc.date2007-07-20
dc.date.accessioned2026-07-07T10:56:51Z
dc.date.available2026-07-07T10:56:51Z
dc.descriptionWe review the latest attempts to determine the accretion geometry in radio-loud active galactic nuclei (AGN). These objects, which comprise ~10-20% of the AGN population, produce powerful collimated radio jets that can extend thousands of parsecs from the center of the host galaxy. Recent multiwavelength surveys have shown that radio-loudness is more common in low-luminosity AGN than in higher luminosity Seyfert galaxies or quasars. These low-luminosity AGN have small enough accretion rates that they are most likely accreting via a geometrically thick and radiatively inefficient accretion flow. In contrast, X-ray spectroscopic observations of three higher luminosity broad-line radio galaxies (3C 120, 4C+74.26 and PG 1425+267) have found evidence for an untruncated thin disk extending very close to the black hole. These tentative detections indicate that, for this class of radio-loud AGN, the accretion geometry is very similar to their radio-quiet counterparts. These observations suggest that there are three conditions to jet formation that must be satisfied: the presence of a rapidly spinning black hole, an accretion flow with a large H/r ratio, and a favorable magnetic field geometry.
dc.description15 pages, invited review, accepted by Modern Physics Letters A
dc.identifierhttps://arxiv.org/abs/0707.3142
dc.identifierhttp://arxiv.org/abs/0707.3142
dc.identifierMod.Phys.Lett.A22:2397-2411,2007
dc.identifierdoi:10.1142/S0217732307024322
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186555
dc.subjectAstrophysics
dc.titleThe Accretion Geometry in Radio-Loud Active Galaxies
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