Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335906e&link_type=abstract
American Astronomical Society, AAS Meeting #213, #359.06; Bulletin of the American Astronomical Society, Vol. 41, p.503
Mathematics
Logic
Scientific paper
I present near-infrared observations and theoretical calculations that provide new insight into the ejecta in the young Galactic supernova remnant Cassiopeia A. Our observations of the infrared synchrotron emission in Cas A, supported by spectroscopy of near-infrared [Fe II] lines, show that the reddening to Cas A's expansion center is higher than previous optical observations indicated, though our measurement is consistent with the broad constraints from radio observations. This has implications for the historical observability of the supernova, as well as for the nucleosynthetic yield. Our observations also allow constraints on the mass of iron heated to optical and infrared emitting temperatures with passage through the reverse shock. New radiative transfer calculations inform the interpretation of the recent Spitzer detection of cold gas-phase ejecta interior to the reverse shock. Finally, I present calculations with a new multi-dimensional, multi-species hydrodynamics code coupled with a non-equilibrium ionization solver that allows detailed spectral and morphological modeling of the shocked ejecta in Cas A.
Arnett David
Eriksen Kristoffer A.
Raymond John C.
Young Patrick A.
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