Chandra LETG observations of supernova remnant 1987A

Svetozar A. Zhekov, Richard McCray, Kazimierz J. Borkowski, David N. Burrows, Sanowook Park

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Abstract

We discuss the results from deep Chandra LETG observations of the supernova remnant 1987A (SNR 1987A). We find that a distribution of shocks, spanning the same range of velocities (from ∼300 to 1700 km s-1) as deduced in the first part of our analysis, can account for the entire X-ray spectrum of this object. The postshock temperature distribution is bimodal, peaking at kT ∼ 0.5 and ∼3 keV. Abundances inferred from the X-ray spectrum have values similar to those for the inner circumstellar ring, except that the abundances of nitrogen and oxygen are approximately a factor of 2 lower than those inferred from the optical/UV spectrum. The velocity of the X-ray-emitting plasma has decreased since 1999, apparently because the blast wave has entered the main body of the inner circumstellar ring.

Original languageEnglish (US)
Pages (from-to)293-302
Number of pages10
JournalAstrophysical Journal
Volume645
Issue number1 I
DOIs
StatePublished - Jul 1 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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