Optical phase coherent timing of the Crab nebula pulsar with Iqueye at the ESO New Technology Telescope
Optical phase coherent timing of the Crab nebula pulsar with Iqueye at the ESO New Technology Telescope
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ESO新技术望远镜上的Iqueye对蟹状星云脉冲星的光学相位相干定时
DOI：
10.1093/mnras/stu136
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发表时间：
2014
影响因子：
4.8
通讯作者：
T. Occhipinti
中科院分区：
文献类型：
--
作者：
L. Zampieri;A. vCadevz;C. Barbieri;G. Naletto;M. Calvani;M. Barbieri;E. Verroi;P. Zoccarato;T. Occhipinti
蟹状星云脉冲星是在2009年1月和12月用安装在欧洲南方天文台3.5米新技术望远镜上的一种新型的非常快的光子计数器Iqueye观测到的。由于Iqueye数据的精美质量，我们计算了两次观测运行和2009年全年的精确相位相干定时解决方案。我们的统计不确定性确定的主脉冲的相位和脉冲星的旋转周期短（几天）的时间间隔分别为$\约1 \，\mu$s和~0.5 ps。与Jodrell银行无线电星历的比较表明，光脉冲导致无线电1 ~240 $\mu$s在1月和~160 $\mu$s在12月，在1996年后进行的一些其他测量一致。三阶多项式拟合充分描述了2009年1月和12月光学观测的自旋下降。的相位噪声是一致的高斯分布的色散$\sigma$的$\approximately 15 \，\mu$s在大多数观测，在协议与光子噪声引起的相位变化的理论预期。
The Crab nebula pulsar was observed in 2009 January and December with a novel very fast optical photon counter, Iqueye, mounted at the ESO 3.5 m New Technology Telescope. Thanks to the exquisite quality of the Iqueye data, we computed accurate phase coherent timing solutions for the two observing runs and over the entire year 2009. Our statistical uncertainty on the determination of the phase of the main pulse and the rotational period of the pulsar for short (a few days) time intervals are $\approx 1 \, \mu$s and ~0.5 ps, respectively. Comparison with the Jodrell Bank radio ephemerides shows that the optical pulse leads the radio one by ~240 $\mu$s in January and ~160 $\mu$s in December, in agreement with a number of other measurements performed after 1996. A third-order polynomial fit adequately describes the spin-down for the 2009 January plus December optical observations. The phase noise is consistent with being Gaussian distributed with a dispersion $\sigma$ of $\approx 15 \, \mu$s in most observations, in agreement with theoretical expectations for photon noise-induced phase variability.