Abstract
view Abstract Citations (76) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Low-Frequency Observations of Galactic Supernova Remnants and the Distribution of Low-Density Ionized Gas in the Interstellar Medium Kassim, Namir E. Abstract New long-wavelength observations of Galactic SNRs at 30.9 and 57.5 MHz are used to derive detailed low-frequency radio spectra for 32 SNRs. Of these, about two-thirds show turnovers at low frequencies, implying the presence of a widespread, but inhomogeneous, ionized absorbing medium along the lines of sight. These observations are combined with other low-frequency data to derive free-free optical depths toward 457 SNRs and to constrain the physical properties of the ionized gas responsible for the absorption. These optical depths are consistent with the expected absorbing properties of extended H II region envelopes. Publication: The Astrophysical Journal Pub Date: December 1989 DOI: 10.1086/168183 Bibcode: 1989ApJ...347..915K Keywords: Interstellar Gas; Interstellar Matter; Radio Astronomy; Radio Sources (Astronomy); Supernova Remnants; Electron Density (Concentration); H Ii Regions; Low Frequencies; Milky Way Galaxy; Optical Thickness; Astrophysics; INTERSTELLAR: MATTER; NEBULAE: H II REGIONS; NEBULAE: SUPERNOVA REMNANTS; RADIO SOURCES: SPECTRA full text sources ADS | data products SIMBAD (49)
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