NANOGrav 15年数据集：引力波背景各向异性的搜寻
高能天体物理现象
2023-06-30 v1 广义相对论与量子宇宙学
摘要
北美纳赫兹引力波天文台（NANOGrav）已在其15年数据集中报告了存在各向同性纳赫兹引力波背景（GWB）的证据。然而，若GWB由旋近超大质量黑洞双星（SMBHB）系统群体产生，则据预言该背景应是各向异性的，取决于这些系统在本地宇宙中的分布以及SMBHB群体的统计性质。在本工作中，我们使用多种方法和基来描述GWB功率在天球上的分布，以搜寻GWB中的各向异性。我们未发现各向异性的显著证据，并给出宽带各向异性的贝叶斯 上限，即 。我们还利用以15年数据集中推断的各向同性GWB为条件的天体物理模拟，推导了由SMBHB系统随机分布所预期各向异性的保守估计，并表明该数据集具有足够灵敏度来探测预言各向异性水平的很大一部分。最后我们强调了在脉冲星计时阵列数据中搜寻各向异性的机遇与挑战。
引用
@article{arxiv.2306.16221,
title = {The NANOGrav 15-year Data Set: Search for Anisotropy in the Gravitational-Wave Background},
author = {Gabriella Agazie and Akash Anumarlapudi and Anne M. Archibald and Zaven Arzoumanian and Paul T. Baker and Bence Bécsy and Laura Blecha and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor 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 Kathryn Crowter and Megan E. DeCesar and Paul B. Demorest and Timothy Dolch and Brendan Drachler and Elizabeth C. Ferrara and William Fiore and Emmanuel Fonseca and Gabriel E. Freedman and Emiko Gardiner and Nate Garver-Daniels and Peter A. Gentile and Joseph Glaser and Deborah C. Good and Kayhan Gültekin and Jeffrey S. Hazboun and Ross J. Jennings and Aaron D. Johnson and Megan L. Jones and Andrew R. Kaiser and David L. Kaplan and Luke Zoltan Kelley and Matthew Kerr and Joey S. Key and Nima Laal and Michael T. Lam and William G. Lamb and T. Joseph W. Lazio and Natalia Lewandowska and Tingting Liu and Duncan R. Lorimer 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 Natasha McMann and Bradley W. Meyers and Chiara M. F. Mingarelli and Andrea Mitridate and Cherry Ng and David J. Nice and Stella Koch Ocker and Ken D. Olum and Timothy T. Pennucci and Benetge B. P. Perera and Nihan S. Pol and Henri A. Radovan and Scott M. Ransom and Paul S. Ray and Joseph D. Romano and Shashwat C. Sardesai and Ann Schmiedekamp and Carl Schmiedekamp and Kai Schmitz and Levi Schult and Brent J. Shapiro-Albert and Xavier Siemens and Joseph Simon and Magdalena S. Siwek and Ingrid H. Stairs and Daniel R. Stinebring and Kevin Stovall and Abhimanyu Susobhanan and Joseph K. Swiggum and Stephen R. Taylor and Jacob E. Turner and Caner Unal and Michele Vallisneri and Sarah J. Vigeland and Haley M. Wahl and Caitlin A. Witt and Olivia Young},
journal= {arXiv preprint arXiv:2306.16221},
year = {2023}
}
备注
19 pages, 11 figures; submitted to Astrophysical Journal Letters as part of Focus on NANOGrav's 15-year Data Set and the Gravitational Wave Background. For questions or comments, please email [email protected]