Radio studies of the ionized gas in the nucleus of M82

Details Radio studies of the ionized gas in the nucleus of M82 Radio studies of the ionized gas in the nucleus of M82

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..546s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 546-559. Research supported by the Natural Sciences

Astronomy and Astrophysics

Astronomy

77

Galactic Nuclei, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Ionized Gases, Radio Galaxies, Radio Spectra, Astronomical Models, Continuous Spectra, Infrared Astronomy, Line Spectra, Relativistic Electron Beams, Stellar Evolution, Synchrotron Radiation

Scientific paper

Continuum and recombination-line radio observations of M82, obtained at 4.87 and 1.48 GHz using the VLA during July 1981 and January and September 1982 are reported. The data are presented in tables, graphs, maps and analyzed in combination with published radio and IR observations. A seven-layer model of the nuclear region is proposed, and the vertical gradient seen in the spectral index is attributed to an age gradient for the radiating particles and the 2000-km/s transport of relativistic particles out of the plane. The ionized gas in the central synchrotron-emission region is found to have maximum density 30/cu cm and to almost entirely fill the nuclear volume, while the molecular gas remains in small isolated clouds in pressure equilibrium with the ionized gas. The nature of the second component of M82, a compact H II complex apparently identical with the VLBI source 41.9 + 58 and objects seen in CO and the forbidden O I line at 63 microns, is briefly considered.

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