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Title:
Observations of IC 443 at 151 and 1419 MHz
Authors:
Green, D. A.
Affiliation:
AA(Mullard Radio Astronomy Observatory, Cambridge, England)
Publication:
Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 221, July 15, 1986, p. 473-482. (MNRAS Homepage)
Publication Date:
07/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MAPS, RADIO SOURCES (ASTRONOMY), SUPERNOVA REMNANTS, HIGH RESOLUTION, NONTHERMAL RADIATION, PARTICLE ACCELERATION, SPECTRUM ANALYSIS
Bibliographic Code:
1986MNRAS.221..473G

Abstract

The supernova remnant IC 443 has been mapped at 151 MHz using the Cambridge Low-Frequency Synthesis Telescope with a resolution of 1.2 x 3.1 sq arcmin (RA x Dec), and at 1419 MHz using the Cambridge Half-Mile Telescope with a resolution of 2.1 x 5.4 sq arcmin (RA x Dec). These observations detect nonthermal emission from the region of the faint optical filaments to the north-east of IC 443. Comparison of the 151-MHz and 1419-MHz maps reveals a region in the south-east with a flatter than average spectrum, and also suggests that the brighter north-east of IC 443 has a flatter spectrum than the faint south-west. This variation, and a possible spectral break for the north-eastern region, are discussed with references to the mechanism of particle acceleration. 151-MHz observations of S252 (3C 153.1) are also presented.

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