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Title:
The expansion of Tycho's supernova remnant as determined by a new algorithm for comparing data
Authors:
Tan, S. M.; Gull, S. F.
Affiliation:
AA(Mullard Radio Astronomy Observatory, Cambridge, England), AB(Mullard Radio Astronomy Observatory, Cambridge, England)
Publication:
Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 216, Oct. 15, 1985, p. 949-970. Research supported by the Cambridge Commonwealth Trust, University of Auckland, and University Grants Committee of New Zealand. (MNRAS Homepage)
Publication Date:
10/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
RADIO SOURCES (ASTRONOMY), STELLAR EVOLUTION, SUPERNOVA REMNANTS, ALGORITHMS, ASTRONOMICAL MAPS, BRIGHTNESS, MAXIMUM LIKELIHOOD ESTIMATES, RADIAL DISTRIBUTION
Bibliographic Code:
1985MNRAS.216..949T

Abstract

The expansion of Tycho's supernova remnant (3C 10) is studied using two pairs of radio observations with intervals of 3.07 and 14.86 yr at frequencies of 2.7 and 1.4 GHz respectively. A new algorithm for data comparison based on the maximum likelihood method is used to correct gain calibration errors in one of the data sets and to estimate the expansion and brightness changes. The average expansion is 0.113±0.006 per cent yr-1. This value is marginally higher than the Sedov rate but is consistent with the previous determination by Strom, Goss & Shaver and with Chevalier's solution for expansion into an interstellar medium of constant density. Graphs of radial slices taken through the remnant at different position angles reveal different types of behaviour, indicating that, on a smaller scale, the medium is inhomogeneous.

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