NANOGrav 15年数据集：探测器表征与噪声预算
高能天体物理现象
2023-06-29 v1 宇宙学与河外天体物理
星系天体物理
天体物理仪器与方法
广义相对论与量子宇宙学
摘要
脉冲星计时阵列（PTA）是星系尺度的引力波探测器。每条由毫秒脉冲星、射电望远镜和长达千秒差距的路径组成的独立臂在性质上各不相同，但总体上可用于提取低频引力波（GW）信号。我们提出一项噪声与灵敏度分析，以配合NANOGrav 15年数据发布及相关论文，并深入介绍PTA噪声模型。作为分析的第一步，我们用三类白噪声参数和两类红噪声参数来表征每个独立的脉冲星数据集。这些参数，连同计时模型，特别是用于时变色散测量的分段常数模型，决定了我们所搜寻的低频GW波段上的灵敏度曲线。我们列出了本数据发布中所有脉冲星的信息并给出若干代表性灵敏度曲线。随后，我们利用信噪比统计量组合各脉冲星的灵敏度，以计算PTA对GW随机背景的全局灵敏度，在5 nHz处获得最小噪声特征应变 。幂律积分分析显示与NANOGrav 15年GW背景分析中所恢复出的振幅大致吻合。尽管我们的唯象噪声模型未显式建模所有已知物理效应，它仍准确刻画了数据中的噪声，同时保持对多类GW信号的灵敏度。
引用
@article{arxiv.2306.16218,
title = {The NANOGrav 15-Year Data Set: Detector Characterization and Noise Budget},
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 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 Nate Garver-Daniels and Peter A. Gentile and Joseph Glaser and Deborah C. Good and Lydia Guertin 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 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:2306.16218},
year = {2023}
}
备注
67 pages, 73 figures, 3 tables; published in 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]