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Chandra HETG Spectra of SN 1987A at 20 Years
We have undertaken deep, high-resolution observations of SN 1987A at approximately 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 ratios in the 6-20 AA bandpass...
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| Published in: | The Astrophysical journal 2008-04, Vol.676 (2), p.L131-L134 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
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| cited_by | cdi_FETCH-LOGICAL-c410t-b85928cff9021c01e259f6256916f7fad8a8025338da45c3960e9f656bf7b0653 |
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| cites | cdi_FETCH-LOGICAL-c410t-b85928cff9021c01e259f6256916f7fad8a8025338da45c3960e9f656bf7b0653 |
| container_end_page | L134 |
| container_issue | 2 |
| container_start_page | L131 |
| container_title | The Astrophysical journal |
| container_volume | 676 |
| creator | Dewey, D Zhekov, S. A McCray, R Canizares, C. R |
| description | We have undertaken deep, high-resolution observations of SN 1987A at approximately 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 ratios in the 6-20 AA bandpass, which includes the H-like and He-like lines of Si, Mg, and Ne, as well as 0 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. |
| doi_str_mv | 10.1086/587549 |
| format | article |
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| identifier | ISSN: 1538-4357 |
| ispartof | The Astrophysical journal, 2008-04, Vol.676 (2), p.L131-L134 |
| issn | 1538-4357 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_20865897 |
| source | EZB Electronic Journals Library |
| subjects | Astronomy Earth, ocean, space Exact sciences and technology |
| title | Chandra HETG Spectra of SN 1987A at 20 Years |
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