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The Accretion Geometry in Radio-Loud Active Galaxies
D. R. Ballantyne
We 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 p…
Radio Synchrotron Emission from Secondary Leptons in the Vicinity of Sgr A*
Roland M. Crocker, David Jones, David R. Ballantyne +1
A point-like source of ~TeV gamma-rays has recently been seen towards the Galactic center by HESS and other air Cerenkov telescopes. In recent work (Ballantyne et al. 2007), we dem…
Constraining Radiatively Inefficient Accretion Flows with Polarization
D. R. Ballantyne, F. Ozel, D. Psaltis
The low-luminosity black hole Sgr A* provides a testbed for models of Radiatively Inefficient Accretion Flows (RIAFs). Recent sub-millimeter linear polarization measurements of Sgr…
The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?
M. C. Erlund, A. C. Fabian, Katherine M. Blundell +2
We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (whose redshift is z=0.104). Both XMM-Newton and Chandra im…
A Possible Link Between the Galactic Center HESS Source and Sgr A*
D. R. Ballantyne, Fulvio Melia, Siming Liu +1
Recently, HESS and other air Cerenkov telescopes have detected a source of TeV gamma-rays coincident with the Galactic center. It is not yet clear whether the gamma-rays are produc…