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

Deeg, Hans-Joerg; Brinks, Elias; Duric, Neb; Klein, Uli; Skillman, Evan
Referencia bibliográfica

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

Fecha de publicación:
6
1993
Número de autores
5
Número de autores del IAC
0
Número de citas
43
Número de citas referidas
41
Descripción
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.