New 325 MHz observations of H II galaxies - The mechanisms that shape the unusual radio spectra

Details New 325 MHz observations of H II galaxies - The mechanisms that shape the unusual radio spectra New 325 MHz observations of H II galaxies - The mechanisms that shape the unusual radio spectra

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..626d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 2, p. 626-649.

Astronomy and Astrophysics

Astrophysics

27

Galactic Structure, H Ii Regions, Radio Spectra, Emission Spectra, Radio Emission, Relativistic Electron Beams, Synchrotron Radiation, Very Large Array (Vla)

Scientific paper

The B array of the VLA has observed a sample of seven H II galaxies at 325 and 1489 MHz; the radio continuum spectra thus obtained exhibit a wide variety of spectral shapes, but four show a significant flattening toward lower frequencies. A detailed discussion is conducted of this LF flattening, invoking several radio emission and absorption mechanisms and energy losses of relativistic electrons. Such model-dependent parameters as the spectral index of injected electrons, the radio-emission spectral index, the thermal electron density, and the age of the relativistic electrons, are derived.

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