Kinematics of X-ray Emitting Components in Cassiopeia A

Details Kinematics of X-ray Emitting Components in Cassiopeia A Kinematics of X-ray Emitting Components in Cassiopeia A

2004-06-01

arxiv.org/abs/astro-ph/0406045v1

Astrophys.J. 613 (2004) 343-348

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures, accepted to ApJ

Scientific paper

10.1086/422906

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.

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