Issue |
A&A
Volume 691, November 2024
|
|
---|---|---|
Article Number | A212 | |
Number of page(s) | 8 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202451345 | |
Published online | 15 November 2024 |
Eccentricity effects on the supermassive black hole gravitational wave background
1
Keemilise ja Bioloogilise Füüsika Instituut,
Rävala pst. 10,
10143
Tallinn,
Estonia
2
Departament of Cybernetics, Tallinn University of Technology,
Akadeemia tee 21,
12618
Tallinn,
Estonia
3
Dipartimento di Fisica e Astronomia, Università degli Studi di Padova,
Via Marzolo 8,
35131
Padova,
Italy
4
Istituto Nazionale di Fisica Nucleare, Sezione di Padova,
Via Marzolo 8,
35131
Padova,
Italy
★ Corresponding author; juhan.raidal@kbfi.ee
Received:
2
July
2024
Accepted:
3
October
2024
We studied how eccentricity affects the gravitational wave (GW) spectrum from supermassive black hole (SMBH) binaries. We developed a fast and accurate semi-analytic method for computing the GW spectra, the distribution for the spectral fluctuations and the correlations between different frequencies. As GW emission circularizes binaries, the suppression of the signal strength due to eccentricity is relevant for signals from wider binaries emitting at lower frequencies. Such a feature is present in the signal observed at pulsar timing arrays. We found that when orbital decay of the SMBH binaries is driven by GWs only, the shape of the observed signal preferred highly eccentric binaries ⟨e⟩2nHz =0.830.04−0.05. However, when environmental effects were included, the initial eccentricity could be significantly lowered, yet the scenario with purely circular binaries was still mildly disfavored.
Key words: black hole physics / gravitational waves / quasars: supermassive black holes
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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