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R.J. Tuffs, C.C. Popescu, H.J. Voelk (Max-Planck-Institut fuer Kernphysik, Astrophysics Department)
We investigate the content of circumstellar and ejected dust within the prototype remnant of the core collapse supernova Cassiopeia A as revealed by maps of the spatial and spectral distribution of IR continuum emission at 60, 100, 170 and 200 microns. By making use of our multi-wavelength coverage and the fact that the colour temperature of the emission from cold dust in Cas A differs from that of the confusing foreground clouds, we could achieve the first detection of thermal FIR emission from the remnant longwards of 100 microns. We find no evidence for the presence of 2-4 solar masses of cold dust in the remnant as reported by Dunne et al. (2004) on the basis of SCUBA maps. In addition to the cold dust, we detect small quantities of hot, collisionally-heated grains towards both the shocked X-ray-emitting ejecta and circumstellar medium, as previously detected in measurements by IRAS (Dwek et al. 1987) and in recent maps at 24 and 70 micron by Spitzer (Hines et al. 2004).
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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.