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EVIDENCE OF X-RAY SYNCHROTRON EMISSION FROM ELECTRONS ACCELERATED TO 40 TeV IN THE SUPERNOVA REMNANT CASSIOPEIA A
 

Summary: EVIDENCE OF X-RAY SYNCHROTRON EMISSION FROM ELECTRONS ACCELERATED
TO 40 TeV IN THE SUPERNOVA REMNANT CASSIOPEIA A
G. E. ALLEN,1 J. W. KEOHANE,2 E. V. GOTTHELF,3 R. PETRE, AND K. JAHODA
NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 662, Greenbelt, MD 20771
AND
R. E. ROTHSCHILD, R. E. LINGENFELTER, W. A. HEINDL, D. MARSDEN, D. E. GRUBER, M. R. PELLING, AND P. R. BLANCO
University of California, San Diego, Center for Astrophysics and Space Sciences, Code 0111, 9500 Gilman Drive, La Jolla, CA 92093
Received 1997 May 27; accepted 1997 July 9
ABSTRACT
We present the 260 keV spectrum of the supernova remnant Cassiopeia A measured using the Proportional
Counter Array and the High Energy X-Ray Timing Experiment on the Rossi X-Ray Timing Explorer satellite. In
addition to the previously reported strong emission-line features produced by thermal plasmas, the broadband
spectrum has a high-energy "tail" that extends to energies at least as high as 120 keV. This tail may be described
by a broken power law that has photon indices of 1 1.8 0.6
0.5
and 2 3.04 0.13
0.15
and a break energy of Eb
15.9 0.4
0.3

  

Source: Allen, Glenn E. - Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (MIT)
Blanco, Philip R. - Center for Astrophysics & Space Sciences, University of California at San Diego

 

Collections: Physics