Chandra HETG Spectra Of SN 1987A At 20 Years

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Chandra HETG Spectra Of SN 1987A At 20 Years does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chandra HETG Spectra Of SN 1987A At 20 Years, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra HETG Spectra Of SN 1987A At 20 Years will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-764137

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.