Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1310d&link_type=abstract
American Astronomical Society, HEAD meeting #10, #13.10
Astronomy and Astrophysics
Astronomy
Scientific paper
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 in the 6 A to 20 A bandpass, which includes the H-like and He-like lines of Si, Mg, Ne, as well as O VIII lines and bright Fe XVII lines. In joint analysis with the LETG data taken in 2004 and 2007, we find that there has been a significant decrease in the average temperature of the highest temperature component of the shocked-plasma emission; this is also illustrated as an evolution of the shock emission-measure distribution from 2004 to 2007. 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 had been allowed by the LETG 2004 observations.
Support for this work was provided by NASA through the SAO contract SV3-73016 to MIT for Support of the Chandra X-Ray Center, which is operated by SAO for and on behalf of NASA under contract NAS8-03060, and by Chandra grant GO7-8062X to the University of Colorado.
Canizares Calude R.
Dewey Daniel
McCray Richard
Zhekov Svetozar A.
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