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arXiv 0907.5308astro-ph.HEastro-ph.IM
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高能脉冲星PSR J1838-0655的X射线性质

The X-ray Properties of the Energetic Pulsar PSR J1838-0655

Lupin Chun-Che Lin, Jumpei Takata, Chorng-Yuan Hwang, Jau-Shian Liang

摘要:

我们提出并解释了X射线脉冲星PSR J1838-0655的几个新的X射线特征。X射线数据来自CHANNSHE、RXTE和SUZAKU的存档数据。我们结合所有这些X射线数据和拟合光谱与不同的模型。我们发现,联合光谱是很难适应一个单一的幂律,一个破碎的幂律模型,在6.5千电子伏左右的休息,可以提高拟合显着。光子指数从$Γ$ = 1.0(低于6.5 keV)变为$Γ$ = 1.5(高于6.5 keV);这表明硬X射线的光谱行为较软。在2-20 keV能量范围内,X射线通量为1.6 × 10 ^{-11}尔格·厘米^{-2}·秒^{-1}。在0.8-10 keV能量范围内,由自旋下降光度产生的转换效率约为0.9%,远高于具有类似时间特性的类星体的转换效率(约10^{-3}% - 10^{-4}%)。我们讨论了所观察到的高X射线转换效率的非热辐射机制,并发现从磁层的一个大大倾斜的转子的发射是最有利的解释转换率和脉冲轮廓在X射线波段。在SUZAKU/XIS的光谱中也检测到一个接近6.65 keV的线特征,它可能是脉冲星周围高度电离的Fe的K $_α$发射。

英文摘要:

We present and interpret several new X-ray features of the X-ray pulsar PSR J1838-0655. The X-ray data are obtained from the archival data of CHANDRA, RXTE}, and SUZAKU. We combine all these X-ray data and fit the spectra with different models. We find that the joint spectra are difficult to fit with a single power law; a broken power-law model with a break at around 6.5 keV can improve the fit significantly. The photon index changes from $Γ$ = 1.0 (below 6.5 keV) to $Γ$ = 1.5 (above 6.5 keV); this indicates a softer spectral behaviour at hard X-rays. The X-ray flux at 2-20 keV is found to be 1.6x10^{-11} ergs cm^{-2} s^{-1}. The conversion efficiency from the spin-down luminosity is ~ 0.9% at 0.8-10 keV, which is much higher than that (~ 10^{-3}% - 10^{-4}%) of the pulsars that show similar timing properties. We discuss non-thermal radiation mechanisms for the observed high X-ray conversion efficiency and find that emission from the magnetosphere of a greatly inclined rotator is the most favorable interpretation for the conversion rate and the pulse profiles at X-ray bands. A line feature close to 6.65 keV is also detected in the spectra of SUZAKU/XIS; it might be the K$_α$ emission of highly ionised Fe surrounding the pulsar.

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