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arXiv 1001.4045astro-ph.GAastro-ph.HE
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富氧超新星遗迹G292 .0+1.8的外激波:与其大质量祖先星风相互作用的证据

The Outer Shock of the Oxygen-Rich Supernova Remnant G292.0+1.8: Evidence for the Interaction with the Stellar Winds from its Massive Progenitor

Jae-Joon Lee, Sangwook Park, John P. Hughes, Patrick O. Slane, B. M. Gaensler, Parviz Ghavamian, David N. Burrows

摘要:

利用钱德拉X射线天文台的深空观测资料,研究了富氧超新星遗迹G292.0+1.8的外激波结构。我们测量径向变化的电子温度和排放量,我们确定为外部冲击传播到介质中的径向密度递减的配置文件。推断出的环境密度结构是一致的,而不是一个统一的星际介质的一个大质量的祖星的星周风模型。在残骸目前的外半径(~7.7 pc)处,估计的风密度n_H = 0.1 ~ 0.3 cm^-3)与来自红超巨星(RSG)的慢风一致。风的总质量估计约为15 - 40太阳质量(取决于估计的密度范围),假设风向下延伸到祖星的表面附近。G292.0+1.8的整体运动学与残留物通过RSG风扩张的情况一致。

英文摘要:

We study the outer-shock structure of the oxygen-rich supernova remnant G292.0+1.8, using a deep observation with the Chandra X-ray Observatory. We measure radial variations of the electron temperature and emission measure that we identify as the outer shock propagating into a medium with a radially decreasing density profile. The inferred ambient density structure is consistent with models for the circumstellar wind of a massive progenitor star rather than for a uniform interstellar medium. The estimated wind density n_H = 0.1 ~ 0.3 cm^-3) at the current outer radius (~7.7 pc) of the remnant is consistent with a slow wind from a red supergiant (RSG) star. The total mass of the wind is estimated to be ~ 15 - 40 solar mass (depending on the estimated density range), assuming that the wind extended down to near the surface of the progenitor. The overall kinematics of G292.0+1.8 are consistent with the remnant expanding through the RSG wind.

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