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Title:
Spatial spectral index variations in Galactic shell supernova remnants G39.2-0.3 and G41.1-0.3
Authors:
Anderson, Martha C.; Rudnick, Lawrence
Affiliation:
AA(Minnesota Univ., Minneapolis), AB(Minnesota Univ., Minneapolis)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 408, no. 2, p. 514-529. (ApJ Homepage)
Publication Date:
05/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
MILKY WAY GALAXY, PARTICLE ACCELERATION, SPECTRAL EMISSION, SUPERNOVA REMNANTS, SYNCHROTRON RADIATION, INTERSTELLAR MATTER, RADIO SPECTRA, SPATIAL DISTRIBUTION
DOI:
10.1086/172609
Bibliographic Code:
1993ApJ...408..514A

Abstract

Observations of spatial variations in the synchrotron spectra of Galactic shell SNRs G39.2-0.3 and G41.1-0.3 (3C 396 and 3C 397) are reported. Spectral indices in these remnants, as measured between 6 and 20 cm, vary on the order of Delta(alpha) of about 0.2. Comparison of G39.2-0.3 and G41.1-0.3 with seven other shell remnants exhibiting spatially varying spectral indices indicates that in the order of these remnants, brighter regions tend to be flatter. In the younger remnants, the highest emissivity regions are generally the steepest, but with notable exceptions. It is suggested that interactions between the expanding remnant and inhomogeneities in the surrounding medium may be instrumental to determining the spatial distribution of spectral indices in shell SNRs.

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