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Title:
X-ray Evolution of SNR 1987A: The Radial Expansion
Authors:
Racusin, Judith L.; Park, Sangwook; Zhekov, Svetozar; Burrows, David N.; Garmire, Gordon P.; McCray, Richard
Affiliation:
AA(Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA ), AB(Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA ), AC(JILA, University of Colorado, Box 440, Boulder, CO 80309, USA ; On leave from Space Research Institute, Sofia, Bulgaria.), AD(Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA ), AE(Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA ), AF(JILA, University of Colorado, Box 440, Boulder, CO 80309, USA )
Publication:
The Astrophysical Journal, Volume 703, Issue 2, pp. 1752-1759 (2009). (ApJ Homepage)
Publication Date:
10/2009
Origin:
IOP
ApJ Keywords:
supernova remnants, supernovae: individual: SN 1987A, X-rays: ISM
DOI:
10.1088/0004-637X/703/2/1752
Bibliographic Code:
2009ApJ...703.1752R

Abstract

We present the evolution of the radial expansion of SNR 1987A as measured using Chandra X-ray observations taken over the last 10 years. To characterize the complex structure of the remnant and isolate the expansion measurement, we fit the images to several empirical models including: a simple circular torus, a torus with bilateral lobes, and a torus with four tangentially extended lobes. We discuss the results of this measure in the context of the overall evolution of the supernova remnant, for which we believe we have measured the end of the free expansion phase and its transition to the adiabatic phase (at least along the equatorial ring). The timing of this event is in agreement with early predictions of the remnant evolution.
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