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Title:
Chandra HETG Spectra of SN 1987A at 20 Years
Authors:
Dewey, D.; Zhekov, S. A.; McCray, R.; Canizares, C. R.
Affiliation:
AA(Kavli Institute, Massachusetts Institute of Technology, Cambridge, MA 02139; , .), AB(JILA, University of Colorado, Boulder, CO 80309-0440 , .; On leave from Space Research Institute, Sofia, Bulgaria.), AC(JILA, University of Colorado, Boulder, CO 80309-0440 , .), AD(Kavli Institute, Massachusetts Institute of Technology, Cambridge, MA 02139; , .)
Publication:
The Astrophysical Journal, Volume 676, Issue 2, pp. L131-L134. (ApJL Homepage)
Publication Date:
04/2008
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: SN 1987A, Radiation Mechanisms: Thermal, ISM: Supernova Remnants, Techniques: Spectroscopic, X-Rays: ISM
DOI:
10.1086/587549
Bibliographic Code:
2008ApJ...676L.131D

Abstract

We have undertaken deep, high-resolution observations of SN 1987A at ~20 years after its explosion with the Chandra HETG and LETG spectrometers. Here we present the HETG X-ray spectra of SN 1987A having unprecedented spectral resolution and signal-to-noise ratios in the 6-20 Å bandpass, which includes the H-like and He-like lines of Si, Mg, and Ne, as well as O VIII lines and bright Fe XVII lines. In joint analysis with LETG data, we find that there has been a significant decrease from 2004 to 2007 in the average temperature of the highest temperature component of the shocked-plasma emission. Model fitting of the profiles of individual HETG lines yields bulk kinematic velocities of the higher-Z ions, Mg and Si, that are significantly lower than those inferred from the LETG 2004 observations.
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