NANOGrav 15年数据集：由引力波背景对超大质量黑洞双星给出的约束
高能天体物理现象
2023-08-09 v2 宇宙学与河外天体物理
广义相对论与量子宇宙学
摘要
NANOGrav 15年数据集显示出存在低频引力波背景（GWB）的证据。尽管许多物理过程都能产生此类低频引力波，但在此我们将该信号分析为源自分布于整个宇宙的超大质量黑洞（SMBH）双星群体。我们表明，具有天体物理动机的SMBH双星群体模型能够重现所观测低频引力波谱的振幅与形状。虽然在当前测量精度下多种模型变体都能重现GWB谱，我们的结果凸显了精确建模双星演化对于产生真实GWB谱的重要性。此外，尽管合理参数能够重现15年观测，但所隐含的GWB振幅要么需要大量参数处于预期值的边界，要么需要少量参数明显偏离标准预期。尽管我们尚无法明确确立推断GWB信号的起源，该信号与天体物理预期的一致性为确认SMBH双星能够形成、达到亚秒差距间距并最终并合提供了诱人前景。随着显著性随时间增长，GWB谱的高阶特征将明确决定GWB的性质，并允许对SMBH群体给出新颖约束。
引用
@article{arxiv.2306.16220,
title = {The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background},
author = {Gabriella Agazie and Akash Anumarlapudi and Anne M. Archibald and Paul T. Baker and Bence Bécsy and Laura Blecha and Alexander Bonilla and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor and Rand Burnette and Robin Case and J. Andrew Casey-Clyde and Maria Charisi and Shami Chatterjee and Katerina Chatziioannou and Belinda D. Cheeseboro and Siyuan Chen and Tyler Cohen and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Kathryn Crowter and Curt J. Cutler and Daniel J. D'Orazio and Megan E. DeCesar and Dallas DeGan and Paul B. Demorest and Heling Deng 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 Kyle A. Gersbach and Joseph Glaser and Deborah C. Good and Kayhan Gültekin and Jeffrey S. Hazboun and Sophie Hourihane and Kristina Islo and Ross J. Jennings and Aaron 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 Tyson B. Littenberg 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 Natasha McMann and Bradley W. Meyers and Patrick M. Meyers and Chiara M. F. Mingarelli and Andrea Mitridate and Priyamvada Natarajan 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 Polina Petrov and Nihan S. Pol and Henri A. Radovan and Scott M. Ransom and Paul S. Ray and Joseph D. Romano and Jessie C. Runnoe 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 Jerry P. Sun 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 Sarah J. Vigeland and Jeremy M. Wachter and Haley M. Wahl and Qiaohong Wang and Caitlin A. Witt and David Wright and Olivia Young},
journal= {arXiv preprint arXiv:2306.16220},
year = {2023}
}
备注
Accepted by 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]. Edited to fix two equation typos (Eq.13 & 21), and minor text typos