Newly-synthesized elements and pristine dust in Cassiopeia A

Details Newly-synthesized elements and pristine dust in Cassiopeia A Newly-synthesized elements and pristine dust in Cassiopeia A

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..237d&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 237

Astronomy and Astrophysics

Astronomy

Supernova Remnants, Dust, Nucleosynthesis

Scientific paper

Spectroscopic observations at 2.4 - 45 μ m of the young supernova remnant Cas A with the Infrared Space Observatory (ISO) Short Wavelength Spectrometer (SWS) reveal strong emission lines of O, Ne, Si, S, and Ar. These lines are observed at high velocities (several 103 km s-1), and are therefore associated with the supernova ejecta known as the fast-moving knots (FMKs). Continuum emission from dust is also seen in the Cas A spectrum. The continuum strength is spatially well correlated with the O and Ar line strengths, indicating that the dust emission also arises from the FMKs. The dust continuum has an emission feature at ~22 μ m which cannot be fit by typical astronomical silicates, but can be fit with a particular class of silicate minerals. This suggests that the dust in Cas A is silicate material that has freshly condensed from the Cas A ejecta into a mineral form that is uncharacteristic of typical ISM dust grains.

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