Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-25
Astronomy and Astrophysics
Astrophysics
9 pages, AdSpR in press
Scientific paper
10.1016/j.asr.2005.01.075
We continue monitoring supernova remnant (SNR) 1987A with the {\it Chandra X-ray Observatory}. As of 2004 January, bright X-ray spots in the northwest and the southwest are now evident in addition to the bright eastern ring. The overall X-ray spectrum, Since 2002 December, can be described by a planar shock with an electron temperature of $\sim$2.1 keV. The soft X-ray flux is now 8 $\times$ 10$^{-13}$ ergs cm$^{-2}$ s$^{-1}$, which is about five times higher than four years ago. This flux increase rate is consistent with our prediction based on an exponential density distribution along the radius of the SNR between the H{\small II} region and the inner ring. We still have no direct evidence of a central point source, and place an upper limit of $L_X$ = 1.3 $\times$ 10$^{34}$ ergs s$^{-1}$ on the 3$-$10 keV band X-ray luminosity.
Burrows David N.
Garmire Gordon P.
McCray Dick
Park Sangwook
Zhekov Svetozar A.
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