Versatile Directional Searches for Gravitational Waves with Pulsar Timing Arrays

Abstract

By regularly monitoring the most stable millisecond pulsars over many years, pulsar timing arrays (PTAs) are positioned to detect and study correlations in the timing behaviour of those pulsars. Gravitational waves (GWs) from supermassive black hole binaries (SMBHBs) are an exciting potentially detectable source of such correlations. We describe a straight-forward technique by which a PTA can be "phased-up" to form time series of the two polarisation modes of GWs coming from a particular direction of the sky. Our technique requires no assumptions regarding the time-domain behaviour of a GW signal. This method has already been used to place stringent bounds on GWs from individual SMBHBs in circular orbits. Here, we describe the methodology and demonstrate the versatility of the technique in searches for a wide variety of GW signals including bursts with unmodeled waveforms. Using the first six years of data from the Parkes Pulsar Timing Array, we conduct an all-sky search for a detectable excess of GW power from any direction. For the lines of sight to several nearby massive galaxy clusters, we carry out a more detailed search for GW bursts with memory, which are distinct signatures of SMBHB mergers. In all cases, we find that the data are consistent with noise.

Accepted for publication by MNRAS

References in corpus (18)

• Tempo2, a new pulsar timing package. II: The timing model and precision estimates
• European Pulsar Timing Array Limits On An Isotropic Stochastic Gravitational-Wave Background
• Gravitational waves from binary supermassive black holes missing in pulsar observations
• The NANOGrav Nine-year Data Set: Limits on the Isotropic Stochastic Gravitational Wave Background
• Assessing the Role of Spin Noise in the Precision Timing of Millisecond Pulsars
• An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
• Mapping gravitational-wave backgrounds using methods from CMB analysis: Application to pulsar timing arrays
• NANOGrav Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries in Circular Orbits
• A study of spatial correlations in pulsar timing array data
• Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array
• Binary super-massive black hole environments diminish the gravitational-wave signal in the pulsar timing band
• Detection of eccentric supermassive black hole binaries with pulsar timing arrays: Signal-to-noise ratio calculations
• Limits on anisotropy in the nanohertz stochastic gravitational-wave background
• NANOGrav Constraints on Gravitational Wave Bursts with Memory
• A Measurement Model for Precision Pulsar Timing
• Assessing Pulsar Timing Array Sensitivity to Gravitational Wave Bursts with Memory
• A coherent method for the detection and estimation of continuous gravitational wave signals using a pulsar timing array
• Mapping the nano-Hertz gravitational wave sky

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• The NANOGrav 11-Year Data Set: Limits on Gravitational Wave Memory
• Detection and localization of continuous gravitational waves with pulsar timing arrays: the role of pulsar terms
• Pulsars probe the low-frequency gravitational sky: Pulsar Timing Arrays basics and recent results
• Searching for gravitational wave bursts from cosmic string cusps with the Parkes Pulsar Timing Array
• Pulsar timing array constraints on spin-2 ULDM
• Pulsar Timing Perturbations from Galactic Gravitational Wave Bursts with Memory
• On using inspiralling supermassive binary black holes in the PTA frequency band as standard sirens to constrain dark energy
• Pulsar Timing Array Experiments
• Constraints on individual supermassive binary black holes using observations of PSR J1909-3744
• Realistic assessment of a single gravitational wave source localization taking into account precise pulsar distances with pulsar timing arrays