Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-11
Astronomy and Astrophysics
Astrophysics
6 pages (A4 size) including 8 figures & 1 table. To appear in the proceedings of "The X-Ray Universe 2005" conference, Sept 26
Scientific paper
We report on the morphological and spectral evolution of SNR 1987A from the monitoring observations with the Chandra/ACIS. As of 2005, the X-ray-bright lobes are continuously brightening and expanding all around the ring. The softening of the overall X-ray spectrum also continues. The X-ray lightcurve is particularly remarkable: i.e., the recent soft X-ray flux increase rate is significantly deviating from the model which successfully fits the earlier data, indicating even faster flux increase rate since early 2004 (day ~6200). We also report results from high resolution spectral analysis with deep Chandra/LETG observations. The high resolution X-ray line emission features unambiguously reveal that the X-ray emission of SNR 1987A is originating primarily from a "disk" along the inner ring rather than from a spherical shell. We present the ionization structures, elemental abundances, and the shock velocities of the X-ray emitting plasma.
Borkowski Kazimierz J.
Burrows David N.
McCray Richard
Park Sangwook
Racusin Judith L.
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