Gravitational wave sensitivity curve of pulsar timing arrays affected by correlated noises  

作　　者：Shu Liu Ming-Lei Tong 

机构地区：[1]National Time Center,Chinese Academy of Sciences,Xi’an 710600,China [2]Key Laboratory of Time and Frequency Primary Standard,Chinese Academy of Sciences,Xi’an 710600,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2020年第11期293-302,共10页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.U1831130 and U1531112);the program of Youth Innovation Promotion Association CAS(2017450)。

摘　　要：The detection of gravitational waves(GWs)by pulsar timing arrays(PTAs)is not only a very important supplementation of the verification of general relativity but also a new window to study the evolution of supermassive binary black holes and the early universe.However,so far the detection sensitivity of PTAs is not good enough to catch signals of GWs due to the disturbance of various noises.In this paper we explore the influences of the correlated noises caused by the reference clock errors and solar system ephemeris errors in pulsar timing on the detection of stochastic gravitational waves background(GWB).We demonstrate the power-law integrated sensitivity curves of GWB detection under the impacts from these correlated noises.From the simulated data,we find that the influence of different reference timescale is non-negligible,and the influence is even quite huge if one uses a very old version of solar system ephemeris.However,the impact from these correlated noises on the sensitivity curve is very limited for the real observational data released by international pulsar timing arrays(IPTA).We also calculate the signalto-noise ratios based on the theoretical GW amplitude permitted by observations.Moreover,we study how the detection sensitivity increases with more pulsar number and longer observation.

关 键 词：gravitational waves PULSARS general time EPHEMERIDES 

分 类 号：P145.6[天文地球—天体物理] P142.84[天文地球—天文学]