CO Emission in Radio Galaxies at Low and High Redshift

Details CO Emission in Radio Galaxies at Low and High Redshift CO Emission in Radio Galaxies at Low and High Redshift

1998-10-09

arxiv.org/abs/astro-ph/9810163v1

Astronomy and Astrophysics

Astrophysics

LaTex (uses PASP conference style file), 6 pages with 2 postscript and 1 gif figures, to appear in "Highly Redshifted Radio Li

Scientific paper

CO observations of 0 1, P_408MHz > 10^27 Watts/Hz) are consistent with no evolution in molecular gas (H_2) mass with redshift and/or radio power. Of the low-redshift powerful radio galaxies (LzPRGs: z<0.2, P_408MHz MHz > 10^23.5 W/Hz) observed, only one F-R II galaxy has been detected in CO, whereas approximately 50% of the radio-compact (FC) and F-R I galaxies have been detected. The CO and imaging data to date imply that either F-R II galaxies result from mergers of gas-poor galaxies relative to FC/F-R I galaxies, or that some FC/F-R I galaxies evolve into F-R II galaxies. In either scenario, the radio activity in powerful radio galaxies is most likely triggered by a merger event, and H_2 may be the fuel for the active galactic nucleus (AGN) in the early stages of the merger.

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