欧洲脉冲星计时阵列第二次数据发布 II. 用于空间相关引力波的定制化脉冲星噪声模型
高能天体物理现象
2023-10-04 v1 天体物理仪器与方法
摘要
纳赫兹引力波背景(GWB)预计是由大量合并星系中心合并中的超大质量黑洞双星所发射的引力波集合信号主导的聚合信号。脉冲星计时阵列由极稳定的脉冲星组成,是能够探测该背景的最精密实验。然而,GWB在脉冲星计时数据上留下的微弱印记被许多噪声源所掩盖。必须仔细刻画这些噪声以提高对GWB的灵敏度。在本文中,我们提出了一种估计用于建模无色和色噪声的频率系数最优数量并进行模型选择的新技术。我们还在脉冲星计时软件包temponest中引入了一个拟合散射变化的新模型,并创建了欧洲脉冲星计时阵列(EPTA)数据集的真实模拟,以测试我们噪声建模算法的有效性。我们对构成EPTA第二次数据发布(DR2)的25颗毫秒脉冲星(MSP)的噪声特性进行了深入分析,并研究了纳入来自印度PTA合作的低频数据的效果。我们使用enterprise和temponest软件包将噪声模型与EPTA DR1所报告的模型进行比较。我们发现,虽然在部分脉冲星中由于DR2更宽的频率覆盖我们成功地将色噪声与无色噪声解耦,但在其他脉冲星中噪声模型以更复杂的方式演化。我们还发现了PSR J16003053中长期散射变化的证据。通过我们的模拟,我们识别了当前噪声分析技术中的固有偏差,并讨论了它们对GWB搜寻的影响。本文呈现的结果直接有助于提高对GWB的灵敏度,并已被用于全球PTA工作的组成部分。
引用
@article{arxiv.2306.16225,
title = {The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves},
author = {J. Antoniadis and P. Arumugam and S. Arumugam and S. Babak and M. Bagchi and A. S. Bak Nielsen and C. G. Bassa and A. Bathula and A. Berthereau and M. Bonetti and E. Bortolas and P. R. Brook and M. Burgay and R. N. Caballero and A. Chalumeau and D. J. Champion and S. Chanlaridis and S. Chen and I. Cognard and S. Dandapat and D. Deb and S. Desai and G. Desvignes and N. Dhanda-Batra and C. Dwivedi and M. Falxa and R. D. Ferdman and A. Franchini and J. R. Gair and B. Goncharov and A. Gopakumar and E. Graikou and J. -M. Grießmeier and L. Guillemot and Y. J. Guo and Y. Gupta and S. Hisano and H. Hu and F. Iraci and D. Izquierdo-Villalba and J. Jang and J. Jawor and G. H. Janssen and A. Jessner and B. C. Joshi and F. Kareem and R. Karuppusamy and E. F. Keane and M. J. Keith and D. Kharbanda and T. Kikunaga and N. Kolhe and M. Kramer and M. A. Krishnakumar and K. Lackeos and K. J. Lee and K. Liu and Y. Liu and A. G. Lyne and J. W. McKee and Y. Maan and R. A. Main and M. B. Mickaliger and I. C. Niţu and K. Nobleson and A. K. Paladi and A. Parthasarathy and B. B. P. Perera and D. Perrodin and A. Petiteau and N. K. Porayko and A. Possenti and T. Prabu and H. Quelquejay Leclere and P. Rana and A. Samajdar and S. A. Sanidas and A. Sesana and G. Shaifullah and J. Singha and L. Speri and R. Spiewak and A. Srivastava and B. W. Stappers and M. Surnis and S. C. Susarla and A. Susobhanan and K. Takahashi and P. Tarafdar and G. Theureau and C. Tiburzi and E. van der Wateren and A. Vecchio and V. Venkatraman Krishnan and J. P. W. Verbiest and J. Wang and L. Wang and Z. Wu},
journal= {arXiv preprint arXiv:2306.16225},
year = {2023}
}
备注
20 pages, 6 figures, 9 tables