Report
A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
| العنوان: | A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant |
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| المؤلفون: | Toshiki Sato, Eduardo Bravo, Carles Badenes, John P. Hughes, Brian J Williams, Hiroya Yamaguchi |
| المصدر: | Astrophysical Journal. 890(2) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | Chandra X-ray observations of Kepler's supernova remnant indicate the existence of a high-speed Fe-rich ejecta structure in the southwestern region. We report strong K-shell emission from Fe-peak elements (Cr, Mn, Fe, Ni), as well as Ca, in this Fe-rich structure, implying that those elements could be produced in the inner area of the exploding white dwarf. We found Ca/Fe, Cr/Fe, Mn/Fe, and Ni/Fe mass ratios of 1.0%–4.1%, 1.0%–4.6%, 1%–11%, and 2%–30%, respectively. In order to constrain the burning regime that could produce this structure, we compared these observed mass ratios with those in 18 one-dimensional Type Ia nucleosynthesis models (including both near-M Ch and sub-M Ch explosion models). The observed mass ratios agree well with those around the middle layer of incomplete Si burning in Type Ia nucleosynthesis models with a peak temperature of ~(5.0–5.3) × 10(exp 9) K and a high metallicity, Z > 0.0225. Based on our results, we infer the necessity for some mechanism to produce protruding Fe-rich clumps dominated by incomplete Si-burning products during the explosion. We also discuss the future perspectives of X-ray observations of Fe-rich structures in other Type Ia supernova remnants. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1538-4357 0004-637X |
| DOI: | 10.3847/1538-4357/ab6aa2 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20200003049 |
| ملاحظات: | 80GSFC17M0002 JP18H05865 JP19K14739 NNX15AK71G AYA2015-63588-P PGC2018-095317-B-C21 |
| رقم الانضمام: | edsnas.20200003049 |
| قاعدة البيانات: | NASA Technical Reports |
Full Text Finder | تدمد: | 15384357 0004637X |
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| DOI: | 10.3847/1538-4357/ab6aa2 |