Calibration of the Advanced LIGO detectors for the discovery of the binary black-hole merger GW150914
Calibration of the Advanced LIGO detectors for the discovery of the binary black-hole merger GW150914
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DOI：
10.1103/physrevd.95.062003
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发表时间：
2017-03-28
影响因子：
5
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Abbott, B. P.;Abbott, R.;Zweizig, J.
在Advanced LIGO中，双星黑洞合并GW150914的探测和天体物理源参数估计需要对探测器感测到的引力波应变进行校准估计。从每个探测器的差分臂长控制回路读出信号产生估计需要应用时域滤波器，该时域滤波器是从探测器的引力波响应的频域模型设计的。引力波响应模型由探测器的光机响应及其反馈控制系统的特性决定。用于验证模型和表征其不确定性的测量主要来自专用的光子辐射压力致动器，并由光学和射频参考提供交叉检查。我们描述了如何将引力波读出信号校准为等效引力波引起的应变，以及如何评估统计不确定性和系统误差。从2015年9月12日到10月20日，在38个日历日收集的探测器数据包含事件GW 150914和用于估计事件虚警概率的约16天的重合数据。在20 Hz至1 kHz的相关频带内，校准不确定度在幅度上小于10%，在相位上小于10度。
In Advanced LIGO, detection and astrophysical source parameter estimation of the binary black hole merger GW150914 requires a calibrated estimate of the gravitational-wave strain sensed by the detectors. Producing an estimate from each detector's differential arm length control loop readout signals requires applying time domain filters, which are designed from a frequency domain model of the detector's gravitational-wave response. The gravitational-wave response model is determined by the detector's optomechanical response and the properties of its feedback control system. The measurements used to validate the model and characterize its uncertainty are derived primarily from a dedicated photon radiation pressure actuator, with cross-checks provided by optical and radio frequency references. We describe how the gravitational-wave readout signal is calibrated into equivalent gravitational-wave-induced strain and how the statistical uncertainties and systematic errors are assessed. Detector data collected over 38 calendar days, from September 12 to October 20, 2015, contain the event GW150914 and approximately 16 days of coincident data used to estimate the event false alarm probability. The calibration uncertainty is less than 10% in magnitude and 10 degrees in phase across the relevant frequency band, 20 Hz to 1 kHz.