A ¹²CO(1-0) survey of spiral galaxies in the region of the Coma supercluster^*

¹ DEMIRM, Observatoire de Paris, 61 av. de l'Observatoire, 75014 Paris, France; and URA 336 du CNRS
² Ecole normale supérieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France; and URA 336 du CNRS
³ Astronomy Department, University of Minnesota, 116 Church Street SE, Mineapolis, MN 55455, U.S.A.
⁴ ARPEGES, Observatoire de Paris, Section de Meudon, F-92195 Meudon Principal Cedex, France
⁵ Max-Planck-Institut fur Kernphysik, Postfach 103980, D-69117 Heildelberg, Germany
⁶ Osservatorio di Brera, via Brera 28, 20121 Milano, Italy
⁷ Department of Astronomy, Cornell University, Ithaca, NJ 14853, U.S.A.

Send offprint request to: F. Casoli

Received: 4 July 1995
Accepted: 19 September 1995

Abstract

We present observations of the ¹²CO(J=1-0) line at 2.6 mm of 65 galaxies located in the Coma supercluster region: 33 actually belong to the Coma supercluster while 32 are either foreground or background objects. These data have been obtained using the NRAO 12 m telescope at Kitt Peak (United States), and for four galaxies, using the IRAM 30 m telescope at Pico Veleta (Spain). Out of these 65 galaxies, 54 had never been observed in the CO(1-0) line; 49 have been detected by us, of which 37 are new detections. We give molecular gas masses deduced from the CO line integrated intensities, and upper limits for the 16 undetected objects, computed with a Galactic conversion factor N() = 2.3 10²⁰ I(CO) and H₀ = 75 km/s/Mpc.