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Title:
Bulk X-Ray Doppler Velocities in the Supernova Remnant Cassiopeia A
Authors:
Hwang, Una; Szymkowiak, Andrew E.; Petre, Robert; Holt, Stephen S.
Affiliation:
AA(; NASA Goddard Space Flight Center, Greenbelt, MD 20771.; Department of Astronomy, University of Maryland, College Park, MD 20742.), AB(; NASA Goddard Space Flight Center, Greenbelt, MD 20771.; Department of Physics, Yale University, New Haven, CT 06520.), AC(; NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AD(; F. W. Olin College of Engineering, 1735 Great Plain Avenue, Needham, MA 02492-1245.)
Publication:
The Astrophysical Journal, Volume 560, Issue 2, pp. L175-L179. (ApJL Homepage)
Publication Date:
10/2001
Origin:
UCP
ApJ Keywords:
ISM: Individual: Name: Cassiopeia A, ISM: Supernova Remnants, X-Rays: General
DOI:
10.1086/324177
Bibliographic Code:
2001ApJ...560L.175H

Abstract

We map the average line-of-sight velocities of the X-ray-emitting mass in the supernova remnant Cassiopeia A using measurements of the centroid of the Si-Heα blend with the Advanced CCD Imaging Spectrometer on the Chandra X-Ray Observatory. This 4" scale map confirms the broad trends noted in previous studies, namely, that the line-of-sight velocity scale is roughly 2000-3000 km s-1, with relatively more blueshifted material in the southeastern region of the remnant than in the northwest; new details are that the northwestern region consists of two arcs, with the southernmost one representing the most redshifted X-ray-emitting material in Cas A. These results are consistent with contemporaneous results from XMM-Newton. The X-ray patterns resemble the complex velocity patterns measured at optical wavelengths for much denser ejecta, and they support the growing body of evidence that the explosion and subsequent evolution of Cas A were highly asymmetrical.
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