Spectral turnovers of galactic supernova remnants

Details Spectral turnovers of galactic supernova remnants Spectral turnovers of galactic supernova remnants

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199...61d&link_type=abstract

Astrophysical Journal, vol. 199, July 1, 1975, pt. 1, p. 61-68.

Astronomy and Astrophysics

Astrophysics

30

Absorption Spectra, Galactic Structure, Interstellar Extinction, Microwave Spectra, Radiant Flux Density, Supernova Remnants, Astronomical Spectroscopy, H Ii Regions, Interstellar Gas, Milky Way Galaxy

Scientific paper

High-resolution observations of 14 galactic supernova remnants have been made at 80 and 160 MHz with the Culgoora radioheliograph. The spectra of 7 to 10 of the sources exhibit a turnover at some frequency not exceeding 100 MHz which is attributed to free-free absorption taking place in the inner regions of the Galaxy. The absorption could occur in large low-density H II regions created by O5 to O8 stars. Alternatively, absorption could occur in cold dense clouds which are a feature of the steady-state model of the interstellar medium, or, more likely, in cold partly ionized regions of moderate density which are a feature of the time-dependent model.

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