Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3420m&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #34.20; Bulletin of the American Astronomical Society, Vol. 25, p.851
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present 16 - 50 microns spectrophotometry of the Cas A supernova remnant obtained using the Goddard Cooled Grating Spectrometer on the Kuiper Airborne Observatory. The emission from young supernova remnants in this wavelength range appears to be dominated by thermal emission from collisionally heated dust and by fine structure emission from the dominant ionization states of abundant elements. Fine structure line observations provide determinations of the abundance of the ion, the ionization balance if lines of several ionization states are observed, and temperature if fine structure lines arising from excited electronic states are detectable. We have measured the spectrum of the infrared bright North rim of Cas A. The continuum dust emission is very unusual, rising steeply from 17 microns to a peak at 22 microns, declining to longer wavelengths. A strong emission line is seen at 26 microns and a line is weakly detected near 35 microns. The 26 microns line arises from either Fe II or O IV; Fe II also has a line at 35.3 microns. We will discuss the dust composition and energy balance, and the implications of the 26 microns line emission.
Arendt Richard
Casey Sean C.
Chan Kai Wing
Dwek Eli
Glaccum William J.
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