84 gigahertz observations of five Crab-like supernova remnants

Details 84 gigahertz observations of five Crab-like supernova remnants 84 gigahertz observations of five Crab-like supernova remnants

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..171s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 1, 1989, p. 171-177. Research supported by the Research Corp.

Astronomy and Astrophysics

Astronomy

41

Astronomical Spectroscopy, Pulsars, Radio Astronomy, Supernova Remnants, Brightness Distribution, Energy Spectra, Flux Density

Scientific paper

Flux density measurements at 3.6 mm have been made to extend the frequency coverage for three Crablike remnants and two Crablike components within remnants whose large-scale morphologies show shell-type structure. All five objects show flat, polarized, nonthermal radio spectra and associated X-ray emission characteristic of this class. The flux density is found to be lower than expected on the basis of an extrapolation of the spectrum from lower frequencies. If this is due to steepening caused by evolutionary effects, severe constraints can be put on the characteristics of the objects showing spectral steepening: all must be less than 2000 yr old, and the supernovae in which they were born must all have had very unusual properties.

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