Cas A Dynamics: Doppler and Proper Motion

Details Cas A Dynamics: Doppler and Proper Motion Cas A Dynamics: Doppler and Proper Motion

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5903d&link_type=abstract

American Astronomical Society Meeting 208, #59.03; Bulletin of the American Astronomical Society, Vol. 38, p.139

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present Doppler velocity images of the young supernova remnant Cassiopeia A in the infrared emission lines of Ar, Ne, Si, and S observed with the Spitzer IRS and covering nearly the whole extent of the remnant. The measured infrared velocities of the shocked ejecta range from -4000 km/s to +6000 km/s. The Si and S emission near the center of the remnant, that is associated with ejecta that have not yet encountered the reverse shock, also shows both red- and blue-shifted structures with velocities between -3000 km/s and +3000 km/s. These unshocked ejecta provide a unique opportunity to study the kinematics of the explosion free from the influences of the reverse shock and CSM. The infrared kinematics are compared to optical and X-ray Doppler velocities and optical, X-ray, and radio proper motions. This work was performed for the Jet Propulsion Laboratory, California Institute of Technology, sponsored by the United States Government under Prime Contract between California Institute of Technology and NASA.

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