The radio structure of Messier 82 at 23 GHz /1.3 cm/

Details The radio structure of Messier 82 at 23 GHz /1.3 cm/ The radio structure of Messier 82 at 23 GHz /1.3 cm/

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l.149k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 15, 1979, p. L149-L152. Research supported by the National

Astronomy and Astrophysics

Astronomy

7

Centimeter Waves, Galactic Nuclei, Microwave Emission, Radio Sources (Astronomy), Astronomical Maps, Data Reduction, Radio Spectra, Thermal Radiation

Scientific paper

A 23 GHz (1.3 cm) radio map of M82 shows a new component of extended, high-frequency radio emission within about 2 kpc of the M82 nucleus, but outside the boundaries of the centimeter radio source mapped by Kronberg and Wilkinson. When combined with the upper limit for the integrated free-free emission from M82 at 87 GHz, this result sets an upper limit to the amount of thermally emitting gas which is obscured in the nucleus of M82. The new extended component in M82 must have a flat radio spectrum, that is, it is mostly thermal radiation. A firm upper limit to radio emission in the outer arms of M82 has also been established.

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