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http://hdl.handle.net/2289/1403
Title: | Evidence for thermal absorption inside Cassiopeia A |
Authors: | Kassim, N.E. Perley, R.A. Dwarakanath, K.S. Erickson, W.C. |
Keywords: | RADIO CONTINUUM: ISM ISM: SUPERNOVA REMNANTS ISM: INDIVIDUAL NAME: CASSIOPEIA A STARS: SUPERNOVAE: GENERAL |
Issue Date: | Dec-1995 |
Publisher: | The University of Chicago Press for the American Astronomical Society |
Citation: | Astrophysical Journal Letters, 1995, Vol.455, pL59-L62 |
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. |
URI: | http://hdl.handle.net/2289/1403 |
ISSN: | 0004-637X 1538-4357 (online) |
Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?1995ApJ...455L..59K |
Copyright: | (1995) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System. |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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1995 APJ V455 pL59.pdf | 10p. | 2.3 MB | Adobe PDF | View/Open |
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