大力神X-1的朱雀观测：两个回旋谐波的测量
Suzaku Observations of Hercules X-1 : Measurements of the Two Cyclotron Harmonics
摘要：
在2005年10月5日至6日和2006年3月29日至30日，朱雀号观测到吸积动力脉冲星Her X-1两次处于主开启状态，净曝光量分别为30.5 ks和34.4 ks。在2005年和2006年的观测中，探测到的源的平均10-30 keV强度分别为290 mCrab和230 mCrab。在重心和二进制校正后，HXD-PIN在1.23776 s的两种情况下测量的固有脉冲周期。在10 keV以上的能量范围内的脉冲相位平均光谱很好地拟合了“负和正幂律倍指数（NPEX）”模型，乘以在~36 keV的基本回旋共振散射特征，这在HXD-PIN数据中非常显着。共振剖面成功地再现了洛伦兹型散射截面，而不是由高斯型替代。脉冲相位平均HXD-GSO数据，覆盖50-120 keV，是没有特色的。然而，在脉冲衰减阶段和非脉冲阶段之间的差分谱中，在GSO数据中检测到约73 keV的二次谐波回旋共振，深度为1.6 -0.7^+0.9。这使得她的X-1第六脉冲星建立了第二谐波共振。这些结果的影响进行了简要讨论。
英文摘要：
The accretion-powered pulsar Her X-1 was observed with Suzaku twice in its main-on state, on 2005 October 5-6 and 2006 March 29-30, for a net exposure of 30.5 ks and 34.4 ks, respectively. In the 2005 and 2006 observations, the source was detected at an average 10-30 keV intensity of 290 mCrab and 230 mCrab, respectively. The intrinsic pulse period was measured on both occasions at 1.23776 s by HXD-PIN, after barycentric and binary corrections. The pulse phase-averaged spectra in the energy range above 10 keV are well fitted by ``Negative and Positive power-law times EXponential (NPEX)'' model, multiplied by a fundamental cyclotron resonance scattering feature at ~36 keV which appears very significantly in the HXD-PIN data. The resonance profiles were reproduced successfully by the Lorentzian type scattering cross section, rather than by a Gaussian type alternative. The pulse phase-averaged HXD-GSO data, covering 50-120 keV, are featureless. However, in a differential spectrum between the pulse-decay phase and off-pulse phase, the second harmonic cyclotron resonance was detected in the GSO data at ~73 keV, with a depth of 1.6_-0.7^+0.9. This makes Her X-1 a 6th pulsar with established second harmonic resonance. Implications of these results are briefly discussed.
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