Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251...32g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 32-42.
Astronomy and Astrophysics
Astrophysics
47
Interstellar Gas, Molecular Gases, Spiral Galaxies, Astronomical Spectroscopy, Carbon Monoxide, Galactic Nuclei, H Ii Regions, Molecular Clouds, Star Formation
Scientific paper
The central region of the nearby spiral galaxy NGC 4736 has been mapped with high spatial resolution (HPBW = 23 and 14 arcsec) in the two CO lines J = 1-0 and J = 2-1. A total mass of molecular gas in the map of 5.1 x 10 exp 8 solar masses is found for an assumed distance of 6.3 Mpc; this represents only about 4 percent of the dynamical mass in the mapped region. Molecular gas is found in the nucleus, in a ring feature associated with the ring of H II regions lying at 50 arcsec from the center and in an extended disk. The excitation of the gas is everywhere subthermal, with CO (J = 2-1) brightness temperature approaching the CO (J = 1-0) temperature only at particular positions. The neutral gas is mainly molecular in the central two arcminutes with a gas fraction in H2 greater than 0.7.
Casoli Fabienne
Combes François
Gerin Maryvonne
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