国际脉冲星计时阵列第二次数据发布：各向同性引力波背景的搜寻
高能天体物理现象
2022-01-12 v1 天体物理仪器与方法
摘要
我们在国际脉冲星计时阵列（一个综合北美、欧洲和澳大利亚长达十年脉冲星计时观测的全球化合作项目）的第二次数据发布中搜寻各向同性随机引力波背景。在我们针对形式为 的幂律应变谱的参考搜寻中，利用阵列中脉冲星之间的自相关与互相关信息，我们发现了一个谱形相似的低频随机过程的强证据，其振幅为 、谱指数为 ，其中不确定性表示 95% 可信区间。对于 （正如由旋近超大质量黑洞双星群体所预期的那样），恢复出的振幅为 。然而，并未发现表明引力波起源的 Hellings-Downs 相关性的显著证据。我们还以一致的方式分析了各单个脉冲星计时阵列的组成数据，并清楚地表明合并后的国际数据集具有更高的灵敏度。此外，我们证明该合并数据集产生了与近期单个阵列数据集相当的约束，尽管后者拥有比该合并组成部分更多的数据。未来的国际数据发布将提升对引力波辐射的灵敏度，并显著提高探测概率。
引用
@article{arxiv.2201.03980,
title = {The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background},
author = {J. Antoniadis and Z. Arzoumanian and S. Babak and M. Bailes and A. -S. Bak Nielsen and P. T. Baker and C. G. Bassa and B. Becsy and A. Berthereau and M. Bonetti and A. Brazier and P. R. Brook and M. Burgay and S. Burke-Spolaor and R. N. Caballero and J. A. Casey-Clyde and A. Chalumeau and D. J. Champion and M. Charisi and S. Chatterjee and S. Chen and I. Cognard and J. M. Cordes and N. J. Cornish and F. Crawford and H. T. Cromartie and K. Crowter and S. Dai and M. E. DeCesar and P. B. Demorest and G. Desvignes and T. Dolch and B. Drachler and M. Falxa and E. C. Ferrara and W. Fiore and E. Fonseca and J. R. Gair and N. Garver-Daniels and B. Goncharov and D. C. Good and E. Graikou and L. Guillemot and Y. J. Guo and J. S. Hazboun and G. Hobbs and H. Hu and K. Islo and G. H. Janssen and R. J. Jennings and A. D. Johnson and M. L. Jones and A. R. Kaiser and D. L. Kaplan and R. Karuppusamy and M. J. Keith and L. Z. Kelley and M. Kerr and J. S. Key and M. Kramer and M. T. Lam and W. G. Lamb and T. J. W. Lazio and K. J. Lee and L. Lentati and K. Liu and J. Luo and R. S. Lynch and A. G. Lyne and D. R. Madison and R. A. Main and R. N. Manchester and A. McEwen and J. W. McKee and M. A. McLaughlin and M. B. Mickaliger and C. M. F. Mingarelli and C. Ng and D. J. Nice and S. Os lowski and A. Parthasarathy and T. T. Pennucci and B. B. P. Perera and D. Perrodin and A. Petiteau and N. S. Pol and N. K. Porayko and A. Possenti and S. M. Ransom and P. S. Ray and D. J. Reardon and C. J. Russell and A. Samajdar and L. M. Sampson and S. Sanidas and J. M. Sarkissian and K. Schmitz and L. Schult and A. Sesana and G. Shaifullah and R. M. Shannon and B. J. Shapiro-Albert and X. Siemens and J. Simon and T. L. Smith and L. Speri and R. Spiewak and I. H. Stairs and B. W. Stappers and D. R. Stinebring and J. K. Swiggum and S. R. Taylor and G. Theureau and C. Tiburzi and M. Vallisneri and E. van der Wateren and A. Vecchio and J. P. W. Verbiest and S. J. Vigeland and H. Wahl and J. B. Wang and J. Wang and L. Wang and C. A. Witt and S. Zhang and X. J. Zhu},
journal= {arXiv preprint arXiv:2201.03980},
year = {2022}
}
备注
17 pages, 12 figures, accepted in MNRAS