Optimizing Pulsar Timing Arrays Observations for Detection and Characterization of Low-Frequency Gravitational Wave Sources

Abstract

Observations of low-frequency gravitational waves will require the highest possible timing precision from an array of the most spin-stable pulsars. We can improve the sensitivity of a pulsar timing array (PTA) to different gravitational-wave sources by observing pulsars with low timing noise over years to decades and distributed across the sky. We discuss observing strategies for a PTA focused on a stochastic gravitational-wave background such as from unresolved supermassive black hole binaries as well as focused on single continuous-wave sources. First we describe the method to calculate a PTA's sensitivity to different gravitational-wave-source classes. We then apply our method to the 45 pulsars presented in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) 11-year data set. For expected amplitudes of the stochastic background, we find that all pulsars contribute significantly over the timescale of decades; the exception is for very pessimistic values of the stochastic background amplitude. For individual single sources, we find that a number of pulsars contribute to the sensitivity of a given source but that which pulsars contribute are different depending on the source, or versus an all-sky metric. Our results seem robust to the presence of temporally-correlated red noise in pulsar arrival times. It is critical to obtain more robust pulsar-noise parameters as they heavily affect our results. Our results show that it is also imperative to locate and time as many high-precision pulsars as possible, as quickly as possible, to maximize the sensitivity of next-generation PTA detectors.

9 pages, 2 figures, submitted to ApJ

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• Accurate characterization of the stochastic gravitational-wave background with pulsar timing arrays by likelihood reweighting
• Quality over Quantity: Optimizing pulsar timing array analysis for stochastic and continuous gravitational wave signals
• Sensitivity of present and future detectors across the black-hole binary gravitational wave spectrum
• Multimessenger pulsar timing array constraints on supermassive black hole binaries traced by periodic light curves
• Bayesian Solar Wind Modeling with Pulsar Timing Arrays
• Associating Host Galaxy Candidates to Massive Black Hole Binaries resolved by Pulsar Timing Arrays
• Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy
• Inferring neutron star properties with continuous gravitational waves
• Detecting subparsec super-massive binary black holes: Long termmonitoring perspective
• Analysis of Multi-Hour Continuous Observations of Seven Millisecond Pulsars
• A Study in Frequency-Dependent Effects on Precision Pulsar Timing Parameters with the Pulsar Signal Simulator
• Impact of the observation frequency coverage on the significance of a gravitational wave background detection in PTA data
• Precision Timing of PSR J0437-4715 with the IAR Observatory and Implications for Low-Frequency Gravitational Wave Source Sensitivity