• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >THERMAL X-RAY EMISSION FROM SHOCKED EJECTA IN TYPE Ia SUPERNOVA REMNANTS: PROSPECTS FOR EXPLOSION MECHANISM IDENTIFICATION
【24h】

THERMAL X-RAY EMISSION FROM SHOCKED EJECTA IN TYPE Ia SUPERNOVA REMNANTS: PROSPECTS FOR EXPLOSION MECHANISM IDENTIFICATION

机译：Ia型超新星残留物从电击球产生的热X射线发射：爆炸机理鉴定的前景。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The explosion mechanism behind Type Ia supernovae is a matter of continuing debate. The diverse attempts to identify or at least constrain the physical processes involved in the explosion have been only partially successful so far. In this paper we propose to use the thermal X-ray emission from young supernova remnants (SNRs) originating in Type Ia events to extract relevant information concerning the explosions themselves. We have produced a grid of thermonuclear supernova models representative of the paradigms currently under debate: pure deflagrations, delayed detonations, pulsating delayed detonations, and sub-Chandrasekhar explosions, using their density and chemical composition profiles to simulate the interaction with the surrounding ambient medium and the ensuing plasma heating, nonequilibrium ionization and thermal X-ray emission of the ejecta. Key observational parameters such as electron temperatures, emission measures, and ionization timescales are presented and discussed. We find that not only is it possible to identify the explosion mechanism from the spectra of young Type Ia SNRs, it is in fact necessary to take the detailed ejecta structure into account if such spectra are to be modeled in a self-consistent way. Neither element line flux ratios nor element emission measures are good estimates of the true ratios of ejected masses, with differences of as much as 2 or 3 orders of magnitude for a given model. Comparison with observations of the Tycho SNR suggests a delayed detonation as the most probable explosion mechanism. Line strengths, line ratios, and the centroid of the Fe Kα line are reasonably well reproduced by a model of this kind.
机译：Ia型超新星背后的爆炸机制是一个持续争论的问题。到目前为止，识别或至少限制爆炸所涉及的物理过程的各种尝试仅获得了部分成功。在本文中，我们建议使用源自Ia类事件的年轻超新星遗留物（SNR）的热X射线发射来提取有关爆炸本身的相关信息。我们绘制了代表当前正在讨论的范例的热核超新星模型网格：纯爆燃，延迟爆轰，脉动延迟爆轰和钱德拉塞卡亚爆炸，并利用它们的密度和化学成分剖面模拟了与周围环境介质和随之而来的等离子体加热，喷射的非平衡电离和热X射线发射。介绍并讨论了关键的观测参数，例如电子温度，发射措施和电离时标。我们发现，不仅可以从年轻的Ia型SNR光谱中识别爆炸机理，而且实际上如果要以自洽的方式对这种光谱进行建模，还必须考虑详细的喷射结构。元素线通量比和元素发射量均不能很好地估计射出质量的真实比例，对于给定的模型，其差异最多可达2或3个数量级。与第谷SNR观测值的比较表明，延迟爆炸是最可能的爆炸机制。 FeKα线的线强度，线比和质心可以通过这种模型得到很好的再现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号