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Calibration of the Advanced LIGO detectors for the discovery of the binary black-hole merger GW150914

机译:用于发现二进制黑洞合并的先进利极探测器GW150914的校准

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摘要

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° in phase across the relevant frequency band, 20 Hz to 1 kHz.
机译:在先进的LIGO中,二进制黑洞合并GW150914的检测和天体物理源参数估计需要校准检测器感测的引力波应变的校准估计。从每个检测器的差分臂长度控制回路读数信号产生估计需要应用时域滤波器,其由检测器的重力波响应的频域模型设计。引力波响应模型由检测器的光学力学响应和其反馈控制系统的性能决定。用于验证模型和表征其不确定性的测量主要来自专用光子辐射压力致动器,通过光学和射频参考提供交叉检查。我们描述了引力波读出信号如何校准在等同的重力波诱导的应变以及如何评估统计不确定性和系统误差。探测器数据在2015年9月12日至10月20日至10月20日到2015年9月20日收集的数据,其中包含GW150914和大约16天的重合数据,用于估计事件误报概率。校准不确定度幅度小于10%,在相关频段的相位中较大10°,20 Hz至1 kHz。

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  • 来源
    《Physical Review D》 |2017年第8期|062003.1-062003.16|共16页
  • 作者单位

    LIGO California Institute of Technology Pasadena California 91125 USA;

    LIGO California Institute of Technology Pasadena California 91125 USA;

    Louisiana State University Baton Rouge Louisiana 70803 USA;

    LIGO California Institute of Technology Pasadena California 91125 USA;

    University of Florida Gainesville Florida 32611 USA;

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  • 正文语种 eng
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