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arXiv 1102.1442astro-ph.HE
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高分辨率模拟SN 1996 cr的X射线谱线:探测喷出物/CSM几何形状

Modeling SN 1996cr's X-ray lines at high-resolution: Sleuthing the ejecta/CSM geometry

Daniel Dewey, Franz E. Bauer, Vikram V. Dwarkadas

摘要:

SN 1996 cr位于Circinus星系(3.7 Mpc,z ~ 0.001),在约1000天的X射线中未被检测到,但在10年后变亮至约4 x 10^{39} erg/s(0.5-8 keV)(Bauer等人,2008)。一个1-D流体动力学模型的喷出物CSM相互作用产生良好的协议与测量的X射线光变曲线和光谱在多个时期。我们得出结论,SN 1996 cr的前身可能是一颗大质量恒星,M > 30 M_solar,在其约0.04 pc的风吹壳内爆炸之前,它从RSG到短暂的W-R阶段(Dwarkadas et al. 2010)。进一步分析钱德拉HETG观测的深度,可以对光谱中少数明亮的Si和Fe线进行线形拟合。线的形状很好地拟合轴对称发射模型与轴方向~ 55度,我们的视线。在深2009年的时代,更高的电离Fe XXVI发射被限制在高纬度地区:奥卡姆最好的方式来获得来自高纬度/极地地区的Fe H-类发射是有更多的CSM在两极/周围比在中纬度和低纬度,随着对称的喷出物爆炸/分布。类似的CSM/喷出物特征可能用于其他SNe,并且通过更高通量的X射线观测,也可能用于伽马射线暴残余物。

英文摘要:

SN 1996cr, located in the Circinus Galaxy (3.7 Mpc, z ~ 0.001) was non-detected in X-rays at ~ 1000 days yet brightened to ~ 4 x 10^{39} erg/s (0.5-8 keV) after 10 years (Bauer et al. 2008). A 1-D hydrodynamic model of the ejecta-CSM interaction produces good agreement with the measured X-ray light curves and spectra at multiple epochs. We conclude that the progenitor of SN 1996cr could have been a massive star, M > 30 M_solar, which went from an RSG to a brief W-R phase before exploding within its ~ 0.04 pc wind-blown shell (Dwarkadas et al. 2010). Further analysis of the deep Chandra HETG observations allows line-shape fitting of a handful of bright Si and Fe lines in the spectrum. The line shapes are well fit by axisymmetric emission models with an axis orientation ~ 55 degrees to our line-of-sight. In the deep 2009 epoch the higher ionization Fe XXVI emission is constrained to high lattitudes: the Occam-est way to get the Fe H-like emission coming from high latitude/polar regions is to have more CSM at/around the poles than at mid and lower lattitudes, along with a symmetric ejecta explosion/distribution. Similar CSM/ejecta characterization may be possible for other SNe and, with higher-throughput X-ray observations, for gamma-ray burst remnants as well.

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