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arXiv 1001.0983astro-ph.HE
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Ia型超新星遗迹0519-69.0的运动学和化学分层

The kinematics and chemical stratification of the Type Ia supernova remnant 0519-69.0

Daria Kosenko, Eveline Helder, Jacco Vink

摘要:

本文分析了大麦云星云中年轻Ia型超新星遗迹0519-69.0的XMM-牛顿和钱德拉X射线数据。我们使用了Chandra ACIS和XMM-牛顿EPIC-MOS仪器的数据,以及XMM-牛顿反射光栅光谱仪获得的高分辨率X射线光谱。钱德拉的数据显示,有一个径向分层的氧,中等质量的元素和铁,与发射更多的大质量元素更向中心。利用反投影技术,我们测得前向激波半径为4.0(3)pc,反向激波半径为2.7(4)pc。我们采取了所观察到的分层的冲击喷出物考虑到在建模的X射线光谱与多组分NEI模型,与组件对应的层占主导地位的一个或两个元素。添加了一个额外的组件,以代表ISM,这主要是贡献的连续发射。该模型很好地拟合了数据,并且还用于表征从Chandra数据中提取的不同区域的光谱。从我们的光谱分析中,我们发现最丰富元素的冲击喷出物的质量分数为:M(O)= 32%,M(Si/S)=7%/5%,M(Ar+Ca)= 1%,M(Fe)= 55%。从连续谱分量中,我们得到了星周密度nH= 2.4(2)/cm ^3。这一密度,以及对前向和反向激波半径的测量表明,年龄为450+/-200年,略低于但与基于光学回波的估计(600+/-200年)一致。从RGS谱中我们测得的多普勒增宽为sigma=1873+/-50 km/s,这意味着前向激波速度vS = 2770+/-500 km/s。我们讨论的背景下,单简并爆炸模型的结果,使用半解析和数值模拟,并比较0519-69.0与其他Ia型超新星遗迹的特点。

英文摘要:

We present an analysis of the XMM-Newton and Chandra X-ray data of the young Type Ia supernova remnant 0519-69.0 in the Large Magellanic Cloud. We used data from both the Chandra ACIS and XMM-Newton EPIC-MOS instruments, and high resolution X-ray spectra obtained with the XMM-Newton Reflection Grating Spectrometer. The Chandra data show that there is a radial stratification of oxygen, intermediate mass elements and iron, with the emission from more massive elements more toward the center. Using a deprojection technique we measure a forward shock radius of 4.0(3) pc and a reverse shock radius of 2.7(4) pc. We took the observed stratification of the shocked ejecta into account in the modeling of the X-ray spectra with multi-component NEI models, with the components corresponding to layers dominated by one or two elements. An additional component was added in order to represent the ISM, which mostly contributed to the continuum emission. This model fits the data well, and was also employed to characterize the spectra of distinct regions extracted from the Chandra data. From our spectral analysis we find that the fractional masses of shocked ejecta for the most abundant elements are: M(O)=32%, M(Si/S)=7%/5%, M(Ar+Ca)=1%, and M(Fe) = 55%. From the continuum component we derive a circumstellar density of nH= 2.4(2)/cm^3. This density, together with the measurements of the forward and reverse shock radii suggest an age of 450+/-200 yr,somewhat lower than, but consistent with the estimate based on the optical light echo (600+/-200 yr). From the RGS spectra we measured a Doppler broadening of sigma=1873+/-50 km/s, from implying a forward shock velocity of vS = 2770+/-500 km/s. We discuss the results in the context of single degenerate explosion models, using semi-analytical and numerical modeling, and compare the characteristics of 0519-69.0 with those of other Type Ia supernova remnants.

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