Kinematics of X-ray-emitting components in cassiopeia a

Tracey DeLaney, Lawrence Rudnick, Robert A. Fesen, T. W. Jones, Robert Petre, Jon A. Morse

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

We present high-resolution X-ray proper-motion measurements of Cassiopeia A using Chandra X-Ray Observatory 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-1. This is the same as for the forward shock filaments but less than the 0.3% yr-1 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-1. 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.

Original languageEnglish (US)
Pages (from-to)343-348
Number of pages6
JournalAstrophysical Journal
Volume613
Issue number1 I
DOIs
StatePublished - Sep 20 2004

Keywords

  • ISM: Individual (Cassiopeia-A)
  • Supernova remnants

Fingerprint Dive into the research topics of 'Kinematics of X-ray-emitting components in cassiopeia a'. Together they form a unique fingerprint.

Cite this