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arXiv 1306.6867astro-ph.HE
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低光度高质量X射线双星中的热黑体光谱过剩

The hot-blackbody spectral excess in low-luminosity High-Mass X-Ray Binaries

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

摘要:

我们报告了利用XMM-牛顿观测系统对四颗持久、低光度(Lx ~ 10^34 erg/s)和长周期(P > 200 s)Be吸积星进行观测所获得的主要结果。我们发现,这里考虑的所有源的特征在于可以用高温(kTbb > 1 keV)和小面积(Rbb < 0.5 km)的黑体分量描述的光谱过剩。我们证明:1)这一特征是几个低光度X射线双星的共同性质; 2)对于大多数源,黑体参数(半径和温度)都在一个狭窄的数值范围内; 3)它可以解释为来自NS极帽的发射。

英文摘要:

We report on the main results obtained thanks to an observation campaign with XMM-Newton of four persistent, low-luminosity (Lx ~ 10^34 erg/s) and long-period (P > 200 s) Be accreting pulsars. We found that all sources considered here are characterized by a spectral excess that can be described with a blackbody component of high temperature (kTbb > 1 keV) and small area (Rbb < 0.5 km). We show that: 1) this feature is a common property of several low-luminosity X-ray binaries; 2) for most sources the blackbody parameters (radius and temperature) are within a narrow range of values; 3) it can be interpreted as emission from the NS polar caps.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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