Observations of molecular and atomic clouds in M31

Details Observations of molecular and atomic clouds in M31 Observations of molecular and atomic clouds in M31

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..143l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 143-160. Research supported by the Arizona Submillimet

Astronomy and Astrophysics

Astronomy

51

Andromeda Galaxy, Centimeter Waves, H Ii Regions, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Carbon Monoxide, Hydrogen, Millimeter Waves, Solar Neighborhood, Spectral Resolution, Star Formation, Very Large Array (Vla)

Scientific paper

The authors report the first coordinated CO and H I obervations of M31 made with identical and sufficiently high angular and spectral resolutions to resolve individual giant molecular clouds (GMCs) in that galaxy. They used the C and D arrays of the VLA and the 45 m millimeter-wave telescope of the Nobeyama Radio Observatory to map the 21 cm transition of H I and the J = 1→0 transition of CO, respectively, in an individual star-forming complex which is located in an H I spiral arm segment 7 kpc from the center of M31. An angular resolution of 15arcsec was achieved for both the H I and CO observations. It is shown that the observations have resolved individual giant molecular clouds in M31 whose sizes, masses, and physical conditions bear striking resemblance to GMCs in the solar neighborhood of the Milky Way. The implication of these results for the formation and evolution of molecular clouds is discussed.

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