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On Using Inspiraling Supermassive Binary Black Holes in the PTA Frequency Band as Standard Sirens to Constrain Dark Energy
Yan,Changshuo1,2; Zhao,Wen3,4; Lu,Youjun1,2
2020-01-28
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume889Issue:2
AbstractAbstract Supermassive binary black holes (SMBBHs) in galactic centers may radiate gravitational waves (GW) in the nano-Hertz frequency band, which are expected to be detected by pulsar timing arrays (PTAs) in the near future. GW signals from individual SMBBHs at cosmic distances, if detected by PTAs, are potentially powerful standard sirens that can be used to independently measure distances and thus put constraints on cosmological parameters. In this paper, we investigate the constraint that may be obtained on the equation of state (w) of dark energy by using those SMBBHs, expected to be detected by the PTAs in the Square Kilometre Array (SKA) era. By considering both the currently available SMBBH candidates and mock SMBBHs in the universe resulting from a simple galaxy major merger model, we find that ~200–3000 SMBBHs with chirp mass >109 M⊙ are expected to be detected with a signal-to-noise ratio >10 by SKA–PTA with conservative and optimistic settings and they can be used to put a constraint on w to an uncertainty of Δw?~?0.02–0.1. If further information on the mass and mass ratio of those SMBBHs can be provided by electromagnetic observations (e.g., chirp mass uncertainty ?50%), the constraint may be further improved to a ?0.01 level, as many more SMBBHs will be detected by SKA–PTA with relatively better distance measurements and can be used as the standard sirens.
KeywordSupermassive black holes Gravitational waves Gravitational wave astronomy Dark energy Cosmological parameters Active galactic nuclei Fisher's Information Black hole physics Pulsar timing method
DOI10.3847/1538-4357/ab60a6
Language英语
WOS IDIOP:0004-637X-889-2-ab60a6
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28746
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China; yancs@nao.cas.cn, luyj@nao.cas.cn
2.School of Astronomy and Space Science University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
3.CAS Key Laboratory for Researches in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, People's Republic of China; wzhao7@ustc.edu.cn
4.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, 230026, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yan,Changshuo,Zhao,Wen,Lu,Youjun. On Using Inspiraling Supermassive Binary Black Holes in the PTA Frequency Band as Standard Sirens to Constrain Dark Energy[J]. The Astrophysical Journal,2020,889(2).
APA Yan,Changshuo,Zhao,Wen,&Lu,Youjun.(2020).On Using Inspiraling Supermassive Binary Black Holes in the PTA Frequency Band as Standard Sirens to Constrain Dark Energy.The Astrophysical Journal,889(2).
MLA Yan,Changshuo,et al."On Using Inspiraling Supermassive Binary Black Holes in the PTA Frequency Band as Standard Sirens to Constrain Dark Energy".The Astrophysical Journal 889.2(2020).
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