NANOGrav 11年数据集：对500Mpc内星系中超大质量黑洞双星的限制
星系天体物理
2021-06-30 v1 高能天体物理现象
摘要
超大质量黑洞双星（SMBHBs）应作为星系并合的結果而在星系核中频繁形成。在亚秒差距间距下，双星成为低频引力波（GWs）的强源，正是脉冲星计时阵列（PTAs）的探测目标。我们利用北美纳赫兹引力波天文台（NANOGrav）11年数据集中近期关于连续引力波的上限，对邻近大质量星系中假想的SMBHBs施加约束。我们编制了本地宇宙（直至红移约0.05）约44,000个星系的综合星表，并假设双星总质量等于由全局标度关系导出的SMBH质量，用假想双星填充它们。假设在NANOGrav最灵敏频率8nHz处辐射的圆形等质量双星，我们发现216个星系位于NANOGrav的灵敏体积内。我们通过计算此类双星在NANOGrav阵列中将引发的总信噪比（S/N）对潜在SMBHBs按引力波可探测性排序。我们对216个假想双星的质量啁啾与质量比施加了约束。对于19个星系，仅允许质量极不相等的双星，其伴星质量小于主星的10%，大致与对银河系中SMBHB的约束相当。此外，我们得以排除其中若干星系由主并合（质量比至少1/4）送来的双星。我们还首次给出了仅基于引力波数据的主并合送来双星密度的限制。
引用
@article{arxiv.2101.02716,
title = {The NANOGrav 11yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500Mpc},
author = {Zaven Arzoumanian and Paul T. Baker and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor and Bence Becsy and Maria Charisi and Shami Chatterjee and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Megan E. DeCesar and Paul B. Demorest and Timothy Dolch and Rodney D. Elliott and Justin A. Ellis and Elizabeth C. Ferrara and Emmanuel Fonseca and Nathan Garver-Daniels and Peter A. Gentile and Deborah C. Good and Jeffrey S. Hazboun and Kristina Islo and Ross J. Jennings and Megan L. Jones and Andrew R. Kaiser and David L. Kaplan and Luke Z. Kelley and Joey Shapiro Key and Michael T. Lam and T. Joseph W. Lazio and Jing Luo and Ryan S. Lynch and Chung-Pei Ma and Dustin R. Madison and Maura A. McLaughlin and Chiara M. F. Mingarelli and Cherry Ng and David J. Nice and Timothy T. Pennucci and Nihan S. Pol and Scott M. Ransom and Paul S. Ray and Brent J. Shapiro-Albert and Xavier Siemens and Joseph Simon and Renee Spiewak and Ingrid H. Stairs and Daniel R. Stinebring and Kevin Stovall and Joseph K. Swiggum and Stephen R. Taylor and Michele Vallisneri and Sarah J. Vigeland and Caitlin A. Witt and The NANOGrav Collaboration},
journal= {arXiv preprint arXiv:2101.02716},
year = {2021}
}
备注
Submitted to ApJ. Send comments to Maria Charisi ([email protected])