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arXiv 0806.0245astro-ph
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射电脉冲星B0834 +06和B0826-34的XMM-牛顿观测及其对脉冲星内部加速器的启示

XMM-Newton Observations of Radio Pulsars B0834+06 and B0826-34 and Implications for Pulsar Inner Accelerator

J. Gil, F. Haberl, G. Melikidze, U. Geppert, B. Zhang, G. Melikidze

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Accepted for publication by The Astrophysical Journal
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摘要：

本文报道了用\xmm对两颗具有漂移子脉冲的射电双星B 0834 + 06和B 0826 - 34的X射线观测结果。在50 ks暴露时间内，三台EPIC仪器共检测到70个计数的PSR B 0834 + 06。它的光谱最好描述为黑体（BB），温度为$T_s=(2.0^{+2.0}_{-0.9}) \times 10^6$ K，热光度为$L_b=(8.6^{+14.2}_{-4.4}) \times 10^{28}$ erg s $^{-1}$。由于在X射线光谱中具有BB热分量的脉冲星中，热点表面积比典型极帽的表面积小得多，这意味着非偶极表面磁场比来自脉冲星自旋下降的偶极分量强得多（在这种情况下，分别小和强约50倍）。第二颗脉冲星PSR B 0826 - 34在超过50 ks的曝光时间内没有被探测到，给出了辐射热光度$L_b \leq 1.4 \times 10^{29}$ erg s $^{-1}$的上限。我们利用这些数据以及与漂移子脉冲有关的射电辐射数据，检验了部分屏蔽能隙（PSG）模型。

英文摘要：

We report the X-ray observations of two radio pulsars with drifting subpulses: B0834 + 06 and B0826 - 34 using \xmm\. PSR B0834 + 06 was detected with a total of 70 counts from the three EPIC instruments over 50 ks exposure time. Its spectrum was best described as that of a blackbody (BB) with temperature $T_s=(2.0^{+2.0}_{-0.9}) \times 10^6$ K and bolometric luminosity of $L_b=(8.6^{+14.2}_{-4.4}) \times 10^{28}$ erg s$^{-1}$. As it is typical in pulsars with BB thermal components in their X-ray spectra, the hot spot surface area is much smaller than that of the canonical polar cap, implying a non-dipolar surface magnetic field much stronger than the dipolar component derived from the pulsar spin-down (in this case about 50 times smaller and stronger, respectively). The second pulsar PSR B0826 - 34 was not detected over 50 ks exposure time, giving an upper limit for the bolometric luminosity $L_b \leq 1.4 \times 10^{29}$ erg s$^{-1}$. We use these data as well as the radio emission data concerned with drifting subpulses to test the Partially Screened Gap (PSG) model of the inner accelerator in pulsars.

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