Radio observations of H I and OH in the center of the galaxy M 82

Details Radio observations of H I and OH in the center of the galaxy M 82 Radio observations of H I and OH in the center of the galaxy M 82

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137..335w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 2, Aug. 1984, p. 335-342.

Astronomy and Astrophysics

Astrophysics

104

Galactic Nuclei, Hydrogen Clouds, Hydroxyl Emission, Interstellar Masers, Radio Observation, Abundance, Astronomical Maps, Free Radicals, Hydrogen Atoms, Interstellar Extinction, Interstellar Gas, Metallicity

Scientific paper

Observations of the H I and OH absorption in the M 82 continuum source were carried out with the VLA July 10-11, 1981. The observations show that the H I and OH absorption in the central kpc are concentrated primarily in a rotating ring extending between radii 170 pc, 340 pc, and 120 pc thick. The rotation period of the ring is 1.1 x 10 to the 7th years. It is suggested that such an organized feature may be the result of a gravitational encounter between M 81 and M 82. The OH/H I abundance ratio suggests that the gas in the ring has already been processed into stars and that the material has galactic metallic abundances. Total mass in the ring is 1.2 x 10 to the 7th solar mass. The OH masers detected in M 82 are not necessarily stronger than galactic OH masers as long as there are 100 times more spots within M 82 maser regions. The unusually high concentration of maser spots in M 82 may be related to the intense star formation activity.

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