AAS 204th Meeting, June 2004
Session 40 Galaxies
Poster, Tuesday, June 1, 2004, 10:00am-7:00pm, Ballroom

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[40.21] The Rotating Molecular Ring in VII Zwicky 31

S. Venturini, P. M. Solomon (Stony Brook University)

We present a model of the CO(1-0) line emission source located in the nuclear region of the ultraluminous infrared galaxy VII Zwicky 31. The high resolution Institut de Radioastronomie Millimetrique CO maps show clear evidence of rotation, and indeed our simple rotating ring model well describes the kinematic structure of the CO(1-0) data. From our analysis we deduce that the molecular ring has a total mass of only 5.9 x 109 Msol, resulting in a ratio Mgas/L'CO of only 0.7 Msol (K Km s-1 pc2)-1. The absence of evident tidal features and the simple kinematic structure seems to rule out a history of recent galaxy merging. VII Zwicky 31 appears to be simply an isolated, large and extremely gas-rich spiral galaxy harboring an extended starburst.

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