A Multimessenger Search for the Supermassive Black Hole Binary in 3C 66B with the Parkes Pulsar Timing Array
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arXiv
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| Natura: | Preprint |
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2025
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| author | Tremblay, Jacob Cardinal Goncharov, Boris van Haasteren, Rutger Bhat, N. D. Ramesh Chen, Zu-Cheng Di Marco, Valentina Iguchi, Satoru Kapur, Agastya Ling, Wenhua Mandow, Rami Mishra, Saurav Reardon, Daniel J. Shannon, Ryan M. Sudou, Hiroshi Wang, Jingbo Zhao, Shi-Yi Zhu, Xing-Jiang Zic, Andrew |
| author_facet | Tremblay, Jacob Cardinal Goncharov, Boris van Haasteren, Rutger Bhat, N. D. Ramesh Chen, Zu-Cheng Di Marco, Valentina Iguchi, Satoru Kapur, Agastya Ling, Wenhua Mandow, Rami Mishra, Saurav Reardon, Daniel J. Shannon, Ryan M. Sudou, Hiroshi Wang, Jingbo Zhao, Shi-Yi Zhu, Xing-Jiang Zic, Andrew |
| contents | A subparsec supermassive black hole binary (SMBHB) at the center of the galaxy 3C 66B is a promising candidate for continuous gravitational-wave searches with pulsar timing arrays (PTAs). In this work, we search for such a signal in the third data release of the Parkes Pulsar Timing Array. Matching our priors to estimates of binary parameters from electromagnetic observations, we find a log Bayes factor $\ln B = - 0.0027(7)$, highlighting that the source can be neither confirmed nor ruled out. We place upper limits at $95\%$ credibility on the chirp mass $M < 6.90 \times 10^{8}\ M_{\odot}$, and on the characteristic strain amplitude $\textrm{log}_{10}(h_0)< -14.44$. This partially rules out the parameter space suggested by electromagnetic (EM) observations of 3C 66B. We also independently reproduce the calculation of the chirp mass with the 3 mm flux monitor data from the unresolved core of 3C 66B. Based on this, we outline a new methodology for constructing a joint likelihood of EM and gravitational-wave data from SMBHBs. Finally, we suggest that targeted searches may allow firmly established SMBHB candidates to be treated as standard sirens, for complementary constraints on the Universe expansion rate. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20007 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Multimessenger Search for the Supermassive Black Hole Binary in 3C 66B with the Parkes Pulsar Timing Array Tremblay, Jacob Cardinal Goncharov, Boris van Haasteren, Rutger Bhat, N. D. Ramesh Chen, Zu-Cheng Di Marco, Valentina Iguchi, Satoru Kapur, Agastya Ling, Wenhua Mandow, Rami Mishra, Saurav Reardon, Daniel J. Shannon, Ryan M. Sudou, Hiroshi Wang, Jingbo Zhao, Shi-Yi Zhu, Xing-Jiang Zic, Andrew High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology A subparsec supermassive black hole binary (SMBHB) at the center of the galaxy 3C 66B is a promising candidate for continuous gravitational-wave searches with pulsar timing arrays (PTAs). In this work, we search for such a signal in the third data release of the Parkes Pulsar Timing Array. Matching our priors to estimates of binary parameters from electromagnetic observations, we find a log Bayes factor $\ln B = - 0.0027(7)$, highlighting that the source can be neither confirmed nor ruled out. We place upper limits at $95\%$ credibility on the chirp mass $M < 6.90 \times 10^{8}\ M_{\odot}$, and on the characteristic strain amplitude $\textrm{log}_{10}(h_0)< -14.44$. This partially rules out the parameter space suggested by electromagnetic (EM) observations of 3C 66B. We also independently reproduce the calculation of the chirp mass with the 3 mm flux monitor data from the unresolved core of 3C 66B. Based on this, we outline a new methodology for constructing a joint likelihood of EM and gravitational-wave data from SMBHBs. Finally, we suggest that targeted searches may allow firmly established SMBHB candidates to be treated as standard sirens, for complementary constraints on the Universe expansion rate. |
| title | A Multimessenger Search for the Supermassive Black Hole Binary in 3C 66B with the Parkes Pulsar Timing Array |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2508.20007 |