NANOGrav 15 年数据集：脉冲星角相关性的谐波分析
高能天体物理现象
2024-11-21 v1 星系天体物理
广义相对论与量子宇宙学
摘要
脉冲星计时阵列观测发现了各向同性引力波背景的证据，其具有广义相对论所预期的 Hellings-Downs 角相关性。这一解释取决于角相关性的测量形状，在广义相对论下该形状以四极为主。在此我们探索了一种更灵活的参数化：将角相关性展开为 Legendre 多项式之和，并使用贝叶斯分析，利用北美纳赫兹引力波天文台 (NANOGrav) 收集的 15 年脉冲星计时数据集来约束其系数。当包含多极 的 Legendre 多项式时，我们仅在四极中发现了显著信号，其幅度与广义相对论一致，在约 95% 置信水平上非零，贝叶斯因子为 200。当我们包含多极 时，四极相关性的贝叶斯因子证据下降了一个数量级以上，这是由于在约 4 nHz 处存在单极信号的证据，这在之前对 NANOGrav 15 年数据的分析中也被注意到。需要进一步的工作以更好地表征该单极信号的性质及其对四极角相关性证据的影响。
引用
@article{arxiv.2411.13472,
title = {The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations},
author = {Gabriella Agazie and Jeremy G. Baier and Paul T. Baker and Bence Becsy and Laura Blecha and Kimberly K. Boddy and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor and Rand Burnette and J. Andrew Casey-Clyde and Maria Charisi and Shami Chatterjee and Tyler Cohen and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Megan E. DeCesar and Paul B. Demorest and Heling Deng and Lankeswar Dey and Timothy Dolch and Elizabeth C. Ferrara and William Fiore and Emmanuel Fonseca and Gabriel E. Freedman and Emiko C. Gardiner and Kyle A. Gersbach and Joseph Glaser and Deborah C. Good and Kayhan Gultekin and Jeffrey S. Hazboun and Ross J. Jennings and Aaron D. Johnson and David L. Kaplan and Luke Zoltan Kelley and Joey S. Key and Nima Laal and Michael T. Lam and William G. Lamb and Bjorn Larsen and T. Joseph W. Lazio and Natalia Lewandowska and Tingting Liu and Jing Luo and Ryan S. Lynch and Chung-Pei Ma and Dustin R. Madison and Alexander McEwen and James W. McKee and Maura A. McLaughlin and Patrick M. Meyers and Chiara M. F. Mingarelli and Andrea Mitridate and Jonathan Nay and David J. Nice and Stella Koch Ocker and Ken D. Olum and Timothy T. Pennucci and Polina Petrov and Nihan S. Pol and Henri A. Radovan and Scott M. Ransom and Paul S. Ray and Jessie C. Runnoe and Alexander Saffer and Shashwat C. Sardesai and Kai Schmitz and Xavier Siemens and Joseph Simon and Magdalena S. Siwek and Tristan L. Smith and Sophia V. Sosa Fiscella and Ingrid H. Stairs and Daniel R. Stinebring and Abhimanyu Susobhanan and Joseph K. Swiggum and Jacob Taylor and Stephen R. Taylor and Jacob E. Turner and Caner Unal and Michele Vallisneri and Rutger van Haasteren and Joris Verbiest and Sarah J. Vigeland and Caitlin A. Witt and David Wright and Olivia Young},
journal= {arXiv preprint arXiv:2411.13472},
year = {2024}
}
备注
15 pages, 6 figures