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arXiv 1602.02559astro-ph.HE
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SMC X-2在2015年爆发期间的光谱分析

Spectral analysis of SMC X-2 during its 2015 outburst

N. La Palombara, L. Sidoli, F. Pintore, P. Esposito, S. Mereghetti, A. Tiengo

摘要:

我们报告了在2015年10月的最后一次爆发期间对SMC X-2的Swift和XMM-Newton观测结果,这是自2000年以来的第一次爆发。该源达到了非常高的光度($L \sim 10^{38}$ erg s $^{-1}$),这使我们能够对其时间和光谱特性进行详细的分析。我们获得了脉冲周期$P_{\rm spin}$ = 2.372267(5)s和脉冲轮廓的表征也在低能量。主要的光谱成分是一个硬($Γ\simeq 0$)幂律模型与指数截止,但在低能量,我们也检测到一个软(与kT $\simeq$ 0.15 keV)的热组件。在不同的能量下可以观察到几条发射线。这些功能与高度电离的N,O,Ne,Si和Fe的过渡线的识别表明吸积源周围的光电离物质的存在。

英文摘要:

We report on the results of Swift and XMM-Newton observations of SMC X-2 during its last outburst in 2015 October, the first one since 2000. The source reached a very high luminosity ($L \sim 10^{38}$ erg s$^{-1}$), which allowed us to perform a detailed analysis of its timing and spectral properties. We obtained a pulse period $P_{\rm spin}$ = 2.372267(5) s and a characterization of the pulse profile also at low energies. The main spectral component is a hard ($Γ\simeq 0$) power-law model with an exponential cut-off, but at low energies we detected also a soft (with kT $\simeq$ 0.15 keV) thermal component. Several emission lines can be observed at various energies. The identification of these features with the transition lines of highly ionized N, O, Ne, Si, and Fe suggests the presence of photoionized matter around the accreting source.

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