Widespread galactic OH emission at 1720 MHz - A new tracer of spiral arms

Details Widespread galactic OH emission at 1720 MHz - A new tracer of spiral arms Widespread galactic OH emission at 1720 MHz - A new tracer of spiral arms

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l..33t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 1, 1982, p. L33-L37.

Astronomy and Astrophysics

Astrophysics

14

Galactic Radiation, Galactic Structure, Hydroxyl Emission, Milky Way Galaxy, Molecular Clouds, Spiral Galaxies, Brightness Distribution, Galactic Evolution, Mass Distribution, Stellar Envelopes, Stellar Evolution

Scientific paper

Widely extended, weak OH emission has been observed at 1720 MHz in 53
galactic clouds whose sizes are those of giant molecular clouds and
whose distribution appears confined to two inner spiral arms.
Collisional pumping of the OH at low (15-40 K) temperatures seems the
most likely excitation mechanism.

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