欧洲脉冲星计时阵列第二次数据发布 V. 连续引力波信号搜寻
高能天体物理现象
2024-10-09 v3 宇宙学与河外天体物理
星系天体物理
广义相对论与量子宇宙学
摘要
我们呈现了在欧洲脉冲星计时阵列(EPTA)合作的第二次数据发布(DR2)中搜寻连续引力波信号(CGW)的结果。该搜寻中最显著的候选事件具有4-5 nHz的引力波频率。这样的信号可能由本地宇宙中的超大质量黑洞双星(SMBHB)产生。我们呈现了使用贝叶斯和频率学方法对该候选体进行后续分析的结果。贝叶斯分析给出的贝叶斯因子为4,支持存在CGW而非公共不相关噪声过程,而频率学分析估计该候选体的p值为1%,同样假设存在公共不相关红噪声。然而,将包含CGW和引力波背景(GWB)的模型与仅有GWB的模型比较,支持CGW模型的贝叶斯因子仅为0.7。因此,我们无法最终确定所观测特征的根源,但也不能排除其作为CGW源。我们呈现了模拟结果,表明包含微弱引力波背景的数据可能被误解为包含CGW的数据,反之亦然,为EPTA DR2数据提供了两种合理的解释。需要结合所有PTA合作的数据进行进一步研究以揭示该特征的真实起源。
引用
@article{arxiv.2306.16226,
title = {The second data release from the European Pulsar Timing Array V. Search for continuous gravitational wave signals},
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 I. Ferranti 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 S. Manzini and M. B. Mickaliger and I. C. Nitu 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:2306.16226},
year = {2024}
}
备注
13 figures, 15 pages, accepted