Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383l..11k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. L11-L14.
Astronomy and Astrophysics
Astrophysics
30
Andromeda Galaxy, Carbon Monoxide, Galactic Structure, Interstellar Matter, Galactic Mass, Interstellar Gas, Molecular Gases
Scientific paper
M31 was fully surveyed at an angular resolution of 8.7 arcmin in the J = 1 - 0 rotational transition of CO. The 153 x 45 arcmin area observed covers the entire galaxy to a radius of at least 16 kpc, well beyond the optical disk and Population I peak at 10 kpc. The bulk of the CO emission lies between 8 and 11 kpc from the galactic center. Compared with H I, the CO emission is more confined to optical Population I and tends to peak about 1 kpc closer to the center. Although previously few CO observations have been directed toward the NE tangent of the Population I ring, it appears as rich in molecular gas as the SW tangent. Little CO emission is found within 8 kpc of the center of M31. Using the galactic value for the conversion of integrated CO intensity to H2 mass, the total molecular mass of M31 is about 2.5 x 10 exp 8 solar masses, less than one-fourth the molecular mass of the Milky Way computed in the same way.
Dame Thomas M.
Israel Frank P.
Koper E.
Thaddeus Patrick
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