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arXiv 0804.1640astro-ph
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AXP 4U 0142+61的详细高能特征--用INTEGRAL、RXTE、XMM-牛顿和ASCA进行的多年观测

Detailed high-energy characteristics of AXP 4U 0142+61 - Multi-year observations with INTEGRAL, RXTE, XMM-Newton and ASCA

P. R. den Hartog, L. Kuiper, W. Hermsen, V. M. Kaspi, R. Dib, J. Knoedlseder, F. P. Gavriil

摘要:

我们提出了详细的光谱和时间特性,在硬X射线(>10 keV)和软X射线(<10 keV)域,获得使用的数据从INTEGRAL,XMM-牛顿,ASCA和RXTE。INTEGRAL时间平均总光谱显示出类似幂律的形状,光子指数Gamma = 0.93 +/- 0.06。4U 0142+61在229 keV以下被探测到,20 keV和229 keV之间的通量为(15.01 +/- 0.82)x 10^(-11)erg/cm^2/s。使用INTEGRAL的光谱仪SPI同时收集的数据,组合的总光谱产生了峰值能量为228 + 65/-41 keV的光谱突变的第一个证据。没有证据表明总排放量存在重大的长期时间变异性。脉冲发射测量与ISGRI高达160千电子伏。20-160 keV曲线显示了具有6.2 sigma检测显著性的宽双峰脉冲。总的脉冲光谱可以用光子指数r = 0.40 +/-0.15的非常硬的幂律形状来描述。我们在总的高能量带(2.8-300千电子伏)进行相位分辨光谱,并确定至少三个真正不同的脉冲分量与不同的光谱。四次飞行任务的详细结果之间的高度一致性表明,在排放情景下存在一个显著的稳定几何结构。

英文摘要:

We present detailed spectral and temporal characteristics both in the hard X-ray (>10 keV) and soft X-ray (<10 keV) domains, obtained using data from INTEGRAL, XMM-Newton, ASCA and RXTE. The INTEGRAL time-averaged total spectrum shows a power-law like shape with photon index Gamma = 0.93 +/- 0.06. 4U 0142+61 is detected up to 229 keV and the flux between 20 keV and 229 keV is (15.01 +/- 0.82) x 10^(-11) erg/cm^2/s. Using simultaneously collected data with the spectrometer SPI of INTEGRAL the combined total spectrum yields the first evidence for a spectral break with a peak energy of 228 +65/-41 keV. There is no evidence for significant long-term time variability of the total emission. Pulsed emission is measured with ISGRI up to 160 keV. The 20-160 keV profile shows a broad double-peaked pulse with a 6.2 sigma detection significance. The total pulsed spectrum can be described with a very hard power-law shape with a photon index Γ= 0.40 +/- 0.15. We performed phase-resolved spectroscopy over the total high-energy band (2.8-300 keV) and identify at least three genuinely different pulse components with different spectra. The high level of consistency between the detailed results from the four missions is indicative for a remarkable stable geometry underlying the emission scenario.

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