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http://hdl.handle.net/20.500.12386/32109
Titolo: | Spectral Evolution of the X-Ray Remnant of SN 1987A: A High-resolution Chandra HETG Study | Autori: | Ravi, Aravind P. Park, Sangwook Zhekov, Svetozar A. Miceli, Marco ORLANDO, Salvatore Frank, Kari A. Burrows, David N. |
Data pubblicazione: | 2021 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 922 | Fascicolo: | 2 | Da pagina:: | 140 | Abstract: | Based on observations with the Chandra X-ray Observatory, we present the latest spectral evolution of the X-ray remnant of SN 1987A (SNR 1987A). We present a high-resolution spectroscopic analysis using our new deep (∼312 ks) Chandra HETG observation taken in 2018 March as well as archival Chandra grating spectroscopic data taken in 2004, 2007, and 2011 with similarly deep exposures (∼170-350 ks). We perform detailed spectral model fits to quantify changing plasma conditions over the last 14 yr. Recent changes in electron temperatures and volume-emission measures suggest that the shocks moving through the inner ring have started interacting with less dense circumstellar material, probably beyond the inner ring. We find significant changes in the X-ray line-flux ratios (among H- and He-like Si and Mg ions) in 2018, consistent with changes in the thermal conditions of the X-ray-emitting plasma that we infer based on the broadband spectral analysis. Post-shock electron temperatures suggested by line-flux ratios are in the range ∼0.8-2.5 keV as of 2018. We do not yet observe any evidence of substantial abundance enhancement, suggesting that the X-ray emission component from the reverse-shocked metal-rich ejecta is not yet significant in the observed X-ray spectrum. | URI: | http://hdl.handle.net/20.500.12386/32109 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac249a | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac249a | Fulltext: | open |
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