Kinematics of X-ray Emitting Components in Cassiopeia A

Abstract

We present high-resolution X-ray proper motion measurements of Cassiopeia A using Chandra observations from 2000 and 2002. We separate the emission into four spectrally distinct classes: Si-dominated, Fe-dominated, low-energy-enhanced, and continuum-dominated. These classes also represent distinct spatial and kinematic components. The Si- and Fe-dominated classes are ejecta and have a mean expansion rate of 0.2%/yr. This is the same as for the forward shock filaments but less than the 0.3%/yr characteristic of optical ejecta. The low-energy-enhanced spectral class possibly illuminates a clumpy circumstellar component and has a mean expansion rate of 0.05%/yr. The continuum-dominated emission likely represents the forward shock and consists of diffuse circumstellar material which is seen as a circular ring around the periphery of the remnant as well as projected across the center.

arXiv comment15 pages, 3 figures, accepted to ApJ

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• Characterizing the non-thermal emission of Cas A
• Proper Motions and Brightness Variations of Nonthermal X-ray Filaments in the Cassiopeia A Supernova Remnant
• Modeling SNR Cassiopeia A from the Supernova Explosion to its Current Age: The role of post-explosion anisotropies of ejecta
• Spitzer IRAC Images and Sample Spectra of Cassiopeia A's Explosion
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• X-ray Measurements of the Particle Acceleration Properties at Inward Shocks in Cassiopeia A
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• Small-Scale X-ray Variability in the Cassiopeia A Supernova Remnant
• Evidence for past interaction with an asymmetric circumstellar shell in the young SNR Cassiopeia A
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• The Kinematic and Plasma Properties of X-ray Knots in Cassiopeia A from the Chandra HETGS
• Optical Structure and Proper-Motion Age of the Oxygen-rich Supernova Remnant 1E 0102-7219 in the Small Magellanic Cloud
• Nonthermal radiation of young supernova remnants: the case of Cas A
• The Shape of Cas A
• The mass, location and heating of the dust in the Cassiopeia A supernova remnant
• A Comparison of X-ray and Optical Emission in Cassiopeia A
• Spitzer Space Telescope detection of the young supernova remnant 1E 0102.2-7219
• A kinematic study of central compact objects and their host supernova remnants
• Probing Shock Properties with Non-thermal X-ray Filaments in Cas A
• Multi-Year X-ray Variations of Iron-K and Continuum Emissions in the Young Supernova Remnant Cassiopeia A
• Kinematics of Supernova Remnants Using Multiepoch Maximum Likelihood Estimation: Chandra Observation of Cassiopeia A as an Example
• Kinematics of Supernova Remnants: Status of X-Ray Observations
• He abundance of Dense Circumstellar Clumps in the Cassiopeia A Supernova Remnant
• Six Years of Chandra Observations of Supernova Remnants
• A Study of Radio Knots within Supernova Remnant Cassiopeia A
• Spatio-temporal characterization of Cassiopeia A
• Study of the effect of turbulent interstellar mediums on young supernova remnant morphology
• The forward and reverse shock dynamics of Cassiopeia A