Detection and localization of continuous gravitational waves with pulsar timing arrays: The role of pulsar terms

Detection and localization of continuous gravitational waves with pulsar timing arrays: The role of pulsar terms
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用脉冲星定时阵列探测和定位连续引力波:脉冲星项的作用

DOI:
10.1093/mnras/stw1446
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发表时间:
2016-06
影响因子:
4.8
通讯作者:
Manchester R. N.
Manchester R. N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhu X. -J.;Wen L.;Xiong J.;Xu Y.;Wang Y.;Mohanty S. D.;Hobbs G.;Manchester R. N.

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脉冲星计时阵列是一个银河系尺度的纳赫兹引力波(GW)探测器。其目标信号包含两个部分:“地球项”和“脉冲星项”,分别对应于入射到地球和脉冲星上的全球Ws。在这项工作中,我们提出了一个频率论方法的连续波的检测和定位,考虑到脉冲星项,是显着快于现有的方法。我们调查的作用,脉冲星条款比较全信号搜索与地球长期只搜索非进化黑洞双星。通过将该方法应用于合成数据集,我们发现:(i)全信号搜索可以略微提高检测概率(约百分之五);(ii)天空定位是有偏见的,如果只搜索地球的条款和脉冲星条款的列入是至关重要的,以消除这种偏见;在强探测的情况下(信噪比为30),有可能通过GW测量改进脉冲星距离估计。
A pulsar timing array is a Galactic-scale detector of nanohertz gravitational waves (GWs). Its target signals contain two components: the `Earth term' and the `pulsar term' corresponding to GWs incident on the Earth and pulsar respectively. In this work we present a Frequentist method for the detection and localization of continuous waves that takes into account the pulsar term and is significantly faster than existing methods. We investigate the role of pulsar terms by comparing a full-signal search with an Earth-term-only search for non-evolving black hole binaries. By applying the method to synthetic data sets, we find that (i) a full-signal search can slightly improve the detection probability (by about five percent); (ii) sky localization is biased if only Earth terms are searched for and the inclusion of pulsar terms is critical to remove such a bias; (iii) in the case of strong detections (with signal-to-noise ratio $\gtrsim$ 30), it may be possible to improve pulsar distance estimation through GW measurements.
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