Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..153y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 153-166. Research supported by the University of Mass
Astronomy and Astrophysics
Astrophysics
102
Astronomical Maps, Galaxies, Interstellar Gas, Molecular Clouds, Molecular Spectra, Stellar Evolution, Carbon Monoxide, Infrared Radiation, Luminosity, Radio Emission
Scientific paper
CO observations of the peculiar galaxy M82 have been made at 79 positions using the 14 m FCRAO telescope (HPBW = 50arcsec) in order to obtain a fully sampled map of the central 2 kpc as well as the radial distribution of molecular gas out to 3 kpc along the major axis. The velocity field of the molecular gas is derived and it is suggested that the systemic velocity of M82 is close to a value of 175 km s-1. The CO intensity peaks in the center of the galaxy and falls off smoothly by two orders of magnitude out to radii of 2 - 3 kpc. If the relation between CO emission and the mass of molecules is the same in M82 as in our Galaxy, the total H2 mass for the inner 6 kpc of M82 is ≡2×109M_sun; as compared to 2×108M_sun; in H I for the same region. These observations are consistent with the previously proposed models that M82 was once a normal Sc/Irr galaxy which is now accreting interstellar material.
Scoville Nicholas Z.
Young John S.
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