CALIBRATION OF THE NuSTAR HIGH-ENERGY FOCUSING X-RAY TELESCOPE
CALIBRATION OF THE NuSTAR HIGH-ENERGY FOCUSING X-RAY TELESCOPE
复制标题
DOI：
10.1088/0067-0049/220/1/8
复制
发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
K. Madsen;F. Harrison;C. Markwardt;H. An;B. Grefenstette;M. Bachetti;H. Miyasaka;T. Kitaguchi;V. Bhalerao;S. Boggs;F. Christensen;W. Craig;K. Forster;F. Fuerst;C. Hailey;M. Perri;S. Puccetti;V. Rana;D. Stern;D. Walton;N. Westergaard;Will Zhang
中科院分区：
文献类型：
--
作者：
K. Madsen;F. Harrison;C. Markwardt;H. An;B. Grefenstette;M. Bachetti;H. Miyasaka;T. Kitaguchi;V. Bhalerao;S. Boggs;F. Christensen;W. Craig;K. Forster;F. Fuerst;C. Hailey;M. Perri;S. Puccetti;V. Rana;D. Stern;D. Walton;N. Westergaard;Will Zhang
介绍了核光谱望远镜阵列（努斯塔）X射线卫星的定标。我们使用螃蟹作为主要的有效面积校准器，并构造了一个分段线性样条函数来修改渐晕响应。与假设的光谱相比，所有离轴角度和能量的实现残差通常优于±2%，最高可达40 keV，并且由于有限的计数统计而高于5%-10%。使用几个强点源发现了对理论二维点扩散函数（PSF）的经验调整，并且自使命开始以来没有观察到PSF半功率直径的增加。我们报告的探测器增益校准，良好的60 eV的所有等级，并讨论了天文台的计时能力，它有一个绝对的时间为±3毫秒。最后，我们提出了交叉校准结果，从两个运动之间的所有主要并发X射线天文台（Chandra，Swift，Suzaku和XMM-Newton），于2012年和2013年在源3C 273和PKS 2155-304上进行，并显示相对于努斯塔，所有仪器的测量通量差异均在± 10%以内。
We present the calibration of the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. We used the Crab as the primary effective area calibrator and constructed a piece-wise linear spline function to modify the vignetting response. The achieved residuals for all off-axis angles and energies, compared to the assumed spectrum, are typically better than ±2% up to 40 keV and 5%–10% above due to limited counting statistics. An empirical adjustment to the theoretical two-dimensional point-spread function (PSF) was found using several strong point sources, and no increase of the PSF half-power diameter has been observed since the beginning of the mission. We report on the detector gain calibration, good to 60 eV for all grades, and discuss the timing capabilities of the observatory, which has an absolute timing of ±3 ms. Finally, we present cross-calibration results from two campaigns between all the major concurrent X-ray observatories (Chandra, Swift, Suzaku, and XMM-Newton), conducted in 2012 and 2013 on the sources 3C 273 and PKS 2155-304, and show that the differences in measured flux is within ∼10% for all instruments with respect to NuSTAR.