Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-09
Astrophys.J. 511 (1999) 730-738
Astronomy and Astrophysics
Astrophysics
LaTex, 8 pages with 2 postscript and 2 jpg figures, ApJ, in press
Scientific paper
10.1086/306717
The first detection of CO emission in a Fanaroff-Riley Class II (i.e., edge-brightened radio morphology) radio galaxy is presented. Multi- wavelength (0.36-2.17 micron) imaging of 3C 293 shows it to be a disk galaxy with an optical jet or tidal tail extending towards what appears to be a companion galaxy 28 kpc away via a low surface brightness envelope. The molecular gas appears to be distributed in an asymmetric disk rotating around an unresolved continuum source, which is presumably emission from the AGN. A narrow (approx 60 km/s) absorption feature is also observed in the CO spectrum and is coincident with the continuum source. Using the standard CO conversion factor, the molecular gas mass is calculated to be 1.5x10^10 M_sun, several times the molecular gas mass of the Milky Way. The high concentration of molecular gas within the central 3 kpc of 3C 293, combined with the multiwavelength morphological peculiarities, support the idea that the radio activity has been triggered by a gas-rich galaxy-galaxy interaction or merger event.
Evans Aaron S.
Mazzarella Joseph M.
Sanders David B.
Surace Jason A.
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