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Evidence for Thermal Absorption inside Cassiopeia A
Citation
Kassim, NE and Perley, RA and Dwarakanath, KS and Erickson, WC, Evidence for Thermal Absorption inside Cassiopeia A, The Astrophysical Journal, 455, (1) pp. L59-L62. ISSN 0004-637X (1995) [Refereed Article]
DOI: doi:10.1086/309802
Abstract
Subarcminute resolution images of Cas A at 74 and 333 MHz are presented. Comparison with each other and with higher frequency observations indicates that the spectral index of its nonthermal emission flattens below 333 MHz and that the effect is confined toward the central 1' of the source and is maximum at its center. The source of the flattening is unknown, although we show that the data are consistent with absorption by ionized gas inside the radio shell. Such a component may be related to unshocked ejecta still freely expanding within the boundaries of the reverse shock as delineated by X-ray observations. © 1995. The American Astronomical Society. All rights reserved. Printed in U.S.A.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Physical Sciences |
Research Group: | Astronomical sciences |
Research Field: | Galactic astronomy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Erickson, WC (Professor William Erickson) |
ID Code: | 4828 |
Year Published: | 1995 |
Web of Science® Times Cited: | 33 |
Deposited By: | Physics |
Deposited On: | 1995-08-01 |
Last Modified: | 2011-08-24 |
Downloads: | 0 |
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