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arXiv 1506.03069astro-ph.HE
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复合超新星遗迹的晚期演化:SNR G327 .1-1.1中被压碎的脉冲星风星云的深钱德拉观测和流体动力学模拟

Late-time Evolution of Composite Supernova Remnants: Deep Chandra Observations and Hydrodynamical Modeling of a Crushed Pulsar Wind Nebula in SNR G327.1-1.1

Tea Temim, Patrick Slane, Christopher Kolb, John Blondin, John P. Hughes, Niccolo Bucciantini

摘要:

为了更好地了解复合超新星遗迹(SNRs)的演化和它们的恒星注入的相对论粒子的最终命运,我们提出了一个多方面的调查脉冲星风星云(PWN)和它的主机SNR G327.1-1.1之间的相互作用。我们对SNR G327.1-1.1的350 ks钱德拉X射线观测揭示了一个高度复杂的形态;一个类似弓形激波的彗星结构,在SNR内部延伸到大弧的叉状特征,以及SNR壳的热发射。非热辐射的光谱分析提供了PWN结构起源的线索,而PWN区域的丰度增强为超新星喷出物与PWN物质的混合提供了证据。的SNR的整体形态和光谱特性表明,PWN经历了一个不对称的相互作用与SNR的反向冲击(RS),可以发生作为一个结果的密度梯度在周围介质和/或移动的脉冲星,取代PWN从中心的残余。我们对G327.1-1.1进行了流体动力学模拟,结果表明,它的形态和演化可以用一个约17,000年前的复合SNR来描述,该SNR扩展成一个密度梯度,方向垂直于脉冲星的运动。我们还表明,RS/PWN相互作用的情况下,可以再现的宽带频谱的PWN从无线电到伽马射线波长。在这项工作中提出的分析和建模有重要的意义,我们的结构和复合信噪比的演变的一般理解。

英文摘要:

In an effort to better understand the evolution of composite supernova remnants (SNRs) and the eventual fate of relativistic particles injected by their pulsars, we present a multifaceted investigation of the interaction between a pulsar wind nebula (PWN) and its host SNR G327.1-1.1. Our 350 ks Chandra X-ray observations of SNR G327.1-1.1 reveal a highly complex morphology; a cometary structure resembling a bow shock, prong-like features extending into large arcs in the SNR interior, and thermal emission from the SNR shell. Spectral analysis of the non-thermal emission offers clues about the origin of the PWN structures, while enhanced abundances in the PWN region provide evidence for mixing of supernova ejecta with PWN material. The overall morphology and spectral properties of the SNR suggest that the PWN has undergone an asymmetric interaction with the SNR reverse shock (RS) that can occur as a result of a density gradient in the ambient medium and/or a moving pulsar that displaces the PWN from the center of the remnant. We present hydrodynamical simulations of G327.1-1.1 that show that its morphology and evolution can be described by a ~ 17,000 yr old composite SNR that expanded into a density gradient with an orientation perpendicular to the pulsar's motion. We also show that the RS/PWN interaction scenario can reproduce the broadband spectrum of the PWN from radio to gamma-ray wavelengths. The analysis and modeling presented in this work have important implications for our general understanding of the structure and evolution of composite SNRs.

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