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arXiv 1210.7342astro-ph.SRastro-ph.HE
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黑寡妇脉冲星的Chandra观测

Chandra Observations of Black-Widow Pulsars

Peter Gentile, Maura McLaughlin, Mallory Roberts, Fernando Camilo, Jason Hessels, Matthew Kerr, Scott Ransom, Paul Ray, Ingrid Stairs

摘要:

我们描述了对双星毫秒双星PSR J 0023 +0923、J1810+1744、J2215+5135和J2256-1024的首次X射线观测。所有四个都是费米伽马射线源,三个是“黑寡妇”双星,其质量小于0.1太阳质量。数据是使用钱德拉X射线天文台拍摄的,覆盖了每颗脉冲星的完整双星轨道。两颗星,PSR J2215+5135和J2256-1024,在射电波段观测到日食时,显示出显著的轨道变化和X射线通量最小值。这一现象与黑寡妇双星的内激波辐射特征相一致。另外两个光谱源,PSR J 0023 +0923和J1810+1744,没有显示出显著的变异性,但比另外两个源更暗。光谱拟合产生幂律指数,范围从1.4到2.3和黑体温度在数百电子伏特。PSR J2215+5135的光谱显示了显著的硬X射线成分(41%的计数高于2 keV),这是存在双星内激波发射的额外证据。

英文摘要:

We describe the first X-ray observations of binary millisecond pulsars PSRs J0023+0923, J1810+1744, J2215+5135, and J2256-1024. All four are Fermi gamma-ray sources and three are 'black-widow' pulsars, with companions of mass < 0.1 solar masses. Data were taken using the Chandra X-Ray Observatory and covered a full binary orbit for each pulsar. Two pulsars, PSRs J2215+5135 and J2256-1024, show significant orbital variability and X-ray flux minima at the times of eclipses observed at radio wavelengths. This phenomenon is consistent with intrabinary shock emission characteristic of black-widow pulsars. The other two pulsars, PSRs J0023+0923 and J1810+1744, do not demonstrate significant variability, but are fainter than the other two sources. Spectral fits yield power-law indices that range from 1.4 to 2.3 and blackbody temperatures in the hundreds of eV. The spectrum for PSR J2215+5135 shows a significant hard X-ray component (41% of counts are above 2 keV), which is additional evidence for the presence of intrabinary shock emission.

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