New VLBA Identifications of Compact Symmetric Objects

Details New VLBA Identifications of Compact Symmetric Objects New VLBA Identifications of Compact Symmetric Objects

1999-11-16

arxiv.org/abs/astro-ph/9911301v1

New Astron.Rev. 46 (2002) 295-298

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, for "Lifecycles of Radio Galaxies", eds. J. Biretta et al., New Astronomy Reviews

Scientific paper

10.1016/S1387-6473(01)00197-X

The class of radio sources known as Compact Symmetric Objects (CSOs) is of particular interest in the study of the evolution of radio galaxies. CSOs are thought to be young (probably ~10^4 years), and a very high fraction of them exhibit HI absorption toward the central parsecs. The HI, which is thought to be part of a circumnuclear torus of accreting gas, can be observed using the VLBA with high enough angular resolution to map the velocity field of the gas. This velocity field provides new information on the accretion process in the central engines of these young sources. We have identified 9 new CSOs from radio continuum observations for the VLBA Calibrator Survey, increasing the number of known CSOs by almost 50%.

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