Investigation of interstellar ionized gas in the Galaxy from observations of absorption of supernova remnants' emission

Details Investigation of interstellar ionized gas in the Galaxy from observations of absorption of supernova remnants' emission Investigation of interstellar ionized gas in the Galaxy from observations of absorption of supernova remnants' emission

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..796k&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 796

Other

3

Interstellar Gas, Milky Way Galaxy, Ionized Gases, Supernova Remnants, Absorption Spectra, Emission Spectra, Line Of Sight, Optical Thickness, Brightness Temperature

Scientific paper

Recent Pushchino low-frequency observations of galactic supernova remnants (SNRs) at 111, 102, and 83 MHz were used to revise the low-frequency spectra of more than 100 SNRs. Forty-two of them showed low-frequency cutoffs of the spectra due to absorption of SNR emission by line-of-sight interstellar ionized gas. Combined with other low-frequency data, these observations permitted us to determine the optical depths toward 42 SNRs. These optical depths are due to physical properties of the gas responsible for the absorption. Background brightness temperatures and absorption toward these SNRs allowed us to establish the dependence of the optical depth on the background brightness temperature. From these 42 SNRs and 560 pulsars, we selected six SNR-pulsar pairs. The main criterion for pair selection was proximity in positions and distances. A combined analysis of the medium toward the pairs enabled us to determine the dependence of the optical depth toward SNRs on the pulsar dispersion measures and to estimate physical parameters of ionized gas responsible for the absorption observed.

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