DSpace
 

RRI Digital Repository >
04. Astronomy and Astrophysics >
Research Papers (A&A) >

Please use this identifier to cite or link to this item: 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 SizeFormat
1995 APJ V455 pL59.pdf10p.2.3 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace