Chandra HETG Spectra of SN 1987A at 20 years

Details Chandra HETG Spectra of SN 1987A at 20 years Chandra HETG Spectra of SN 1987A at 20 years

2008-02-16

arxiv.org/abs/0802.2340v1

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures, 1 table; accepted for publication in ApJ Letters

Scientific paper

10.1086/587549

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 LETG data, we find that there has been a significant decrease from 2004 to 2007 in the average temperature of the highest temperature component of the shocked-plasma emission. 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 those inferred from the LETG 2004 observations.

Affiliated with

Also associated with

No associations

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

Comments { 0 }

Profile ID: LFWR-SCP-O-248294