NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T13:17:01 PDT
Help | Comment | NED Home

For refcode 1995A&A...298..743H:
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&A...298..743H The CO emission of ring galaxies C. Horellou, F. Casoli, F. Combes, and C. Dupraz DEMIRM, Observatoire de Paris, 61 avenue de 1'Observatoire, F-75014 Paris, France Ecole Normale Superieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France Received 24 January 1994/Accepted 2 December 1994 Abstract. Using the 15m SEST and 30m IRAM telescope we have observed 16 ring galaxies in the ^12^CO(1-0) transition and detected 14. Six ring galaxies have been detected in the ^12^CO(2-1) line. The Cartwheel, often considered as the prototype of ring galaxies, has not been detected. We suggest that the weak CO emission of this galaxy is due to its low metallicity. The observations do not exclude the possibility that the Cartwheel may be H_2_ rich and actively forming stars. We also present new HI detections of six rings. We have compared the CO emission of the ring galaxies with that of the distance-limited sample of Sage (1993a,b) and found that ring galaxies are bright in CO compared to normal galaxies. If the standard conversion factor from CO emissivities into H_2_ column densities holds for ring galaxies, this suggests that a large amount of molecular gas is available for star formation and that ring galaxies are actively forming stars. This result is in agreement with the high far-infrared luminosities of ring galaxies. We have also observed two Hoag-type objects in CO but have detected neither of them. Key words: galaxies: evolution - galaxies: formation - galaxies: ISM - radio lines: galaxies
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home