参考钟对背景引力波灵敏度曲线的影响研究

Research on the effect of referenced clocks on the sensitivity curve of gravitational wave backgrounds

为了研究参考原子时标对脉冲星计时阵探测随机引力波背景的影响,我们分别使用了TA(NTSC),TT(BIPM2013)和TT(TAI)3种参考时,利用脉冲星计时处理软件Tempo2进行了模拟,又使用了国际脉冲星计时阵IPTA的真实观测数据,从计时残差数据得出每个参考时对应的积分灵敏度曲线,分别对模拟、真实数据得到的这3种灵敏度曲线进行了分析比较,该工作在脉冲星计时阵探测引力波时对于时间尺度的选择方面具有参考意义。

In order to study the effect of referenced clocks on the detection of the stochastic gravitational wave backgrounds using pulsar timing arrays,we used three local atomic clocks,TA(NTSC),and TT(BIPM 2013),and TT(TAI),then simulated them using the pulsar timing processing software Tempo2.And we analyzed the real observation data from the International Pulsar Timing Array(IPTA).The integrated sensitivity curves corresponding to all clocks were obtained from the timing residual,and sensitivity curves obtained from simulated and real data are analyzed and compared.This work provides a significant reference for the selection of time scale on the detection of gravitational waves using pulsar timing array.