Messier 51中IIb型SN 2011 dh的XMM-Newton和Swift观测
XMM-Newton and Swift observations of the Type IIb SN 2011dh in Messier 51
摘要:
IIb型SN 2011 dh在附近的星系M51(漩涡星系)中爆炸,为我们提供了研究SNe早期高能辐射的最佳实验室之一。我们在这里给出了一个全面的看法SN 2011 dh的X射线特性的分析,两个点XMM-牛顿早期观测以及完整的斯威夫特X射线望远镜(XRT)数据集(163 ks)。由于XMM-牛顿的高吞吐量,我们能够令人满意地拟合X射线光谱与两个热扩散气体成分,包括一个额外的吸收成分,我们的银河系。幂律模型对数据的描述较差。此外,早期的雨燕XRT光变曲线暗示了早期(< 3 d)的通量过剩,这与激波爆发后几天恒星光球层的绝热冷却相一致。
英文摘要:
The Type IIb SN 2011dh exploded in the nearby galaxy M51 (the Whirlpool Galaxy) and provides us with one of the best laboratory to study early high energy emission from SNe. We give here a comprehensive view of the X-ray properties of SN 2011dh from the analyses of two pointed XMM-Newton early observations as well as of the full Swift X-ray Telescope (XRT) dataset (163 ks). Due to the high XMM-Newton throughput, we were able to satisfactorily fit the X-ray spectrum with two hot diffuse gas components including an additional absorption component to our Galaxy. A power law model provided a worse description of the data. In addition, the early Swift XRT light curve hints of a flux excess at early times (< 3 d), consistent with the adiabatic cooling of stellar's photosphere a few days after the shock breakout.
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