What question did this study set out to answer?

Assess how effectively current Bayesian methods detect continuous gravitational waves and resolve binary parameters using realistic pulsar timing array simulations.

July 25, 2025The Astrophysical JournalOpen Access

Characterizing Continuous Gravitational Waves from Supermassive Black Hole Binaries in Realistic Pulsar Timing Array Data

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Authors

EGEmiko C. GardinerCampbell Collaboration BBB. BécsyUniversity of Birmingham LKLuke Zoltan KelleyNorthwestern University

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Implication

Simulation study demonstrates detection limits for continuous gravitational waves from supermassive black hole binaries in pulsar timing data, highlighting parameter recovery challenges.

Key Points

Assess how effectively current Bayesian methods detect continuous gravitational waves and resolve binary parameters using realistic pulsar timing array simulations.
Simulated the response of the 15-year NANOGrav pulsar timing array to populations of supermassive black hole binaries consistent with the observed gravitational-wave background.
Performed Markov Chain Monte Carlo continuous wave searches and evaluated detection proxies, including optimal signal-to-noise ratio, matched filter statistics, and reduced log-likelihood ratios.
Successful continuous wave detections (Bayes factor > 10) occurred in 53% of realistic binary populations, with a 50% detection fraction reached at a signal-to-noise ratio of 4.6.
Eighty-two percent of detected signals fell in the 6.9 nHz or 10.8 nHz frequency bins, spanning 95th percentile ranges of 4–12 nHz, chirp masses of 0.7–20 × 10^9 M⊙, and sky localizations of 18–13,000 deg^2.
Source confusion between the stochastic background and continuous signals led to false alarms and dismissals, with only 29% of detections estimating chirp mass accurately to within 1 dex.

Cite This Study

Gardiner et al. (2025) studied this question.

synapsesocial.com/papers/6a0e9cf3aa1655e5fb228eb8 https://doi.org/10.3847/1538-4357/ade4c2

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Implication

Simulation study demonstrates detection limits for continuous gravitational waves from supermassive black hole binaries in pulsar timing data, highlighting parameter recovery challenges.

Characterizing Continuous Gravitational Waves from Supermassive Black Hole Binaries in Realistic Pulsar Timing Array Data

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Key Points

Cite This Study

Characterizing Continuous Gravitational Waves from Supermassive Black Hole Binaries in Realistic Pulsar Timing Array Data

Discussion

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Implication

Key Points

Cite This Study

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