Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..521g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 521-527.
Astronomy and Astrophysics
Astrophysics
6
Brightness Distribution, Cassiopeia A, Supernova Remnants, Cosmic Dust, Emission Spectra, Infrared Telescopes, Stellar Luminosity, X Ray Spectra
Scientific paper
Ground-based observations of a small region on the northern rim of Cas A showing structures down to the resolution limit of 5 sec are discussed. It is shown that the brightness distribution in the area has no correlation with the optical, radio, or X-ray emission. The radiating mass derived is found to be comparable to earlier infrared-based estimates, but substantially smaller than X-ray-derived values; this indicates a very low dust-to-gas ratio or coupling, or a very low filling factor for the hot gas. A detailed comparison between 20-micron and X-ray brightness distributions indicate that the dust is associated with the hottest gas found in the blast wave. This is found to be in contrast with its relative inward location near the cooler gas, that can be interpreted as reverse shocked ejecta.
Greidanus Harm
Strom Richard G.
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