Imaging HI Absorption toward Symmetric Radio Galaxies - Evidence for a Circumnuclear Torus

Abstract

Recent VLBI observations have identified several compact radio sources which have symmetric structures on parsec scales, and exhibit HI absorption which appears to be associated with the active nucleus. These sources are uniquely well suited to investigations into the physics of the central engines, in particular to studies of the kinematics of the gas within 100 pc of the core. In these compact sources, it is reasonable to assume that this circumnuclear material is accreting onto, and ``feeding'', the central engine. We present results of HI imaging studies of 3 symmetric radio galaxies which show evidence of a circumnuclear torus.

6 pages, 3 figures, for "Lifecycles of Radio Galaxies", eds. J. Biretta et al., New Astronomy Reviews

References in corpus (2)

• Obscuration of the Parsec Scale Jets in the Compact Symmetric Object 1946+708
• HI Absorption Toward the Nucleus of the Radio Galaxy PKS 2322-123 in A 2597

Cited by in corpus (3)

• The Nuclear Regions of the Seyfert Galaxy NGC 4151 - Parsec-scale HI Absorption and a Remarkable Radio Jet
• A Giant Metrewave Radio Telescope search for associated HI 21cm absorption in high-redshift flat-spectrum sources
• Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at $z=1.2230$ towards TXS1954+513