Implications for the Supermassive Black Hole Binaries from the NANOGrav 15-year Data Set

NANOGrav, EPTA, PPTA, and CPTA have announced the evidence for a stochastic signal from their latest data sets. Supermassive black hole binaries (SMBHBs) are supposed to be the most promising gravitational-wave (GW) sources of pulsar timing arrays. Assuming an astro-informed formation model, we use...

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Bibliographic Details
Published in:arXiv.org 2023-11
Main Authors: Yan-Chen, Bi, Yu-Mei, Wu, Zu-Cheng, Chen, Qing-Guo, Huang
Format: Article
Language:English
Subjects:
Datasets
Frequencies
Gravitational waves
Pulsars
Supermassive black holes
Online Access:Get full text
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Summary:NANOGrav, EPTA, PPTA, and CPTA have announced the evidence for a stochastic signal from their latest data sets. Supermassive black hole binaries (SMBHBs) are supposed to be the most promising gravitational-wave (GW) sources of pulsar timing arrays. Assuming an astro-informed formation model, we use the NANOGrav 15-year data set to constrain the gravitational wave background (GWB) from SMBHBs. Our results prefer a large turn-over eccentricity of the SMBHB orbit when GWs begin to dominate the SMBHBs evolution. Furthermore, the GWB spectrum is extrapolated to the space-borne GW detector frequency band by including inspiral-merge-cutoff phases of SMBHBs and should be detected by LISA, Taiji and TianQin in the near future.
ISSN:2331-8422
DOI:10.48550/arxiv.2307.00722