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Title:
X-ray spectral observations of the crab-like supernova remnants G21.5-0.9 and 3C 58
Authors:
Davelaar, J.; Smith, A.; Becker, R. H.
Affiliation:
AA(EXOSAT Observatory, Darmstadt, West Germany), AB(ESA, Space Science Dept., Noordwijk, Netherlands), AC(California, University, Davis)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. L59-L62. (ApJL Homepage)
Publication Date:
01/1986
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
SUPERNOVA REMNANTS, X RAY ASTRONOMY, ABSORPTION SPECTRA, CENTIMETER WAVES, CRAB NEBULA, HYDROGEN, X RAY SPECTRA
DOI:
10.1086/184603
Bibliographic Code:
1986ApJ...300L..59D

Abstract

Broad-band (2 - 10 keV) spectral data of the Crab-like supernova remnants 3C 58 and G21.5-0.9 have been obtained from the medium-energy instrument on EXOSAT. Both objects show a simple power-law spectrum with a spectral index of 0.72±0.12 for G21.5-0.9 and 1.30±0.26 for 3C 58. VLA 21 cm absorption measurements for G21.5-0.9 indicate a distance of 5.5 - 9.3 kpc.

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