Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..949t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 15, 1985, p. 949-970. Research supported by t
Astronomy and Astrophysics
Astronomy
46
Radio Sources (Astronomy), Stellar Evolution, Supernova Remnants, Algorithms, Astronomical Maps, Brightness, Maximum Likelihood Estimates, Radial Distribution
Scientific paper
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.
Gull Stephen F.
Tan Shao Min
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