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The evolution of the radio emission from Kepler's Supernova remnantHigh-resolution radio maps of Kepler's Supernova remnant (SNR) using all four arrays of the VLA have been obtained at wavelengths of 20 and 6 cm. They show the complete structure of the remnant; all features are resolved with sizes greater than about 2 arcsec, and the relative brightness of the smooth component near the center is about 1/4 the brightness of the rim. The results have been compared with earlier more limited data to measure changes in the remnant over a four-year time span. The SNR is expanding with a mean rate of R proportional to t exp 0.50 with considerable variations around the shell. Values range from R proportional to t exp 0.35 on the bright northern rim to R proportional to t exp 0.65 on the eastern part of the shell. The measurements are consistent with expansion into a variable circumstellar medium.
Document ID
19880057154
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dickel, John R.
(Illinois Univ. Urbana, IL, United States)
Sault, Robert
(Illinois Univ. Urbana, IL, United States)
Arendt, Richard G.
(Illinois Univ. Urbana, IL, United States)
Korista, Kirk T.
(Illinois, University Urbana, United States)
Matsui, Yutaka
(Northwestern University Evanston, IL, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 330
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A44381
Funding Number(s)
CONTRACT_GRANT: NAG8-540
Distribution Limits
Public
Copyright
Other

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