Detailed Radio Spectra of Selected Compact Sources in the Nucleus of M82

Details Detailed Radio Spectra of Selected Compact Sources in the Nucleus of M82 Detailed Radio Spectra of Selected Compact Sources in the Nucleus of M82

1998-03-28

arxiv.org/abs/astro-ph/9803322v1

Astronomy and Astrophysics

Astrophysics

19 pages, 7 tables, 29 figures, LaTeX, requires AAS macros v. 4.0. To appear in ApJ July 20, 1998

Scientific paper

10.1086/305894

We have determined detailed radio spectra for 26 compact sources in the starburst nucleus of M82, between 74 and 1.3 cm. Seventeen show low-frequency turnovers. One other has a thermal emission spectrum, and we identify it as an HII region. The low frequency turnovers are due to absorption by the interstellar gas in M82. New information on the AGN candidate 44.01+595, shows it to have a non-thermal falling powerlaw spectrum at the highest frequencies, and that it is strongly absorbed below 2 GHz. We derive large magnetic fields in the supernova remnants, of order 1-2 milliGauss, hence large pressures in the sources suggest that the brightest ones are either expanding or are strongly confined by a dense interstellar medium. From the largest source in our sample, we derive a supernova rate of 0.016 SN/yr.

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