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Title:
The X-Ray Synchrotron Emission of RCW 86 and the Implications for Its Age
Authors:
Vink, Jacco; Bleeker, Johan; van der Heyden, Kurt; Bykov, Andrei; Bamba, Aya; Yamazaki, Ryo
Affiliation:
AA(Astronomical Institute, University Utrecht, P.O. Box 80000, 3508TA Utrecht, Netherlands; .; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584CA, Utrecht, Netherlands.), AB(Astronomical Institute, University Utrecht, P.O. Box 80000, 3508TA Utrecht, Netherlands; .; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584CA, Utrecht, Netherlands.), AC(South African Astronomical Observatory P.O. Box 9, Observatory 7935, South Africa.), AD(Ioffe Physico-Technical Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia.), AE(RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.), AF(Department of Physics, Hiroshima University, Higa-shi, Hiroshima 739-8526, Japan.)
Publication:
The Astrophysical Journal, Volume 648, Issue 1, pp. L33-L37. (ApJL Homepage)
Publication Date:
09/2006
Origin:
UCP
ApJ Keywords:
Shock Waves, ISM: Supernova Remnants, X-rays: individual (RCW 86)
DOI:
10.1086/507628
Bibliographic Code:
2006ApJ...648L..33V

Abstract

We report X-ray imaging spectroscopy observations of the northeastern shell of the supernova remnant RCW 86 using Chandra and XMM-Newton. Along this part of the shell, the dominant X-ray radiation mechanism changes from thermal to synchrotron emission. We argue that both the presence of X-ray synchrotron radiation and the width of the synchrotron-emitting region suggest a locally higher shock velocity of Vs~2700 km s-1 and a magnetic field of B~24+/-5 μG. Moreover, we also show that a simple power-law cosmic-ray electron spectrum with an exponential cutoff cannot explain the broadband synchrotron emission. Instead, a concave electron spectrum is needed, as predicted by nonlinear shock acceleration models. Finally, we show that the derived shock velocity strengthens the case that RCW 86 is the remnant of SN 185.
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