Chandra Identification of an X-ray Bright Outer Shock Boundary Surrounding Cassiopeia-A

Details Chandra Identification of an X-ray Bright Outer Shock Boundary Surrounding Cassiopeia-A Chandra Identification of an X-ray Bright Outer Shock Boundary Surrounding Cassiopeia-A

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19511206g&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #112.06; Bulletin of the American Astronomical Society, Vol. 31, p.1540

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have identified a sharp X-ray bright boundary at the outer edge of the young supernova remnant Cassiopeia-A using data obtained with the Chandra Observatory. Energy selected maps restricted to the high energy X-ray continuum emission-band (4-6 keV) provides direct evidence for the supernova remnant's projected outer shock front. Thin wisps (< 0.1' wide) form a circular boundary, 2.7' in radius, which is seen to encompass the bulk of the bright thermal X-ray and radio emission. This brightened edge is not evident in the X-ray line emission or the radio continuum data. VLA radio data shows large jumps in the synchrotron polarization angle along the rim, interior to which the inferred magnetic field is predominantly radial; we suggest these jumps arise from compression associated with an outer shock. We consider physical mechanisms for the observed structure. Acknowledgments: SNR research at the University of Minnesota is supported by the NASA Graduate Student Research Program and the National Science Foundation under grant AST 96-19438. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. E.V.G is supported by NASA LTSA grant NAG5-7935.

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