Extending the frequency reach of pulsar timing array based gravitational wave search without high cadence observations

Abstract

Gravitational wave (GW) searches using pulsar timing arrays (PTAs) are assumed to be limited by the typical average observational cadence of $1/(2\mathrm{weeks})$ for a single pulsar to GW frequencies $\lesssim 4\times 10^{-7}$ Hz. We show that this assumption is incorrect and that a PTA can detect signals with much higher frequencies, which are preserved in the data due to aliasing, by exploiting asynchronous observations from multiple pulsars. This allows an observation strategy that is scalable to future large-scale PTAs containing $O(10^3)$ pulsars, enabled by the Five-hundred meter Aperture Spherical Telescope and the Square Kilometer Array, without requiring a higher per-pulsar observation cadence. We show that higher frequency GW observations, reaching up to $4\times 10^{-4}$ Hz with an SKA-era PTA, have significant astrophysical implications, such as (i) a three orders of magnitude better constraint than current high-cadence observations on GW strain in the $[10,400]$ $\mu \mathrm{Hz}$ band, and (ii) sensitive tests of the no-hair theorem in the mass range of supermassive black hole binaries using their inspiral, merger, and ringdown signals.

8 pages, 3 figures, 1 table. Revised version, to be published in ApJL

References in corpus (16)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Kernel density estimation via diffusion
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• A waveform model for eccentric binary black hole based on effective-one-body-numerical-relativity (EOBNR) formalism
• Measuring the parameters of massive black hole binary systems with Pulsar Timing Array observations of gravitational waves
• Self consistent model for the evolution of eccentric massive black hole binaries in stellar environments: implications for gravitational wave observations
• An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
• Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array
• A Periodically Varying Luminous Quasar at z=2 from the Pan-STARRS1 Medium Deep Survey: A Candidate Supermassive Black Hole Binary in the Gravitational Wave-Driven Regime
• Validating the Effective-One-Body Numerical-Relativity Waveform Models for Spin-aligned Binary Black Holes along Eccentric Orbits
• 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
• A coherent method for the detection and estimation of continuous gravitational wave signals using a pulsar timing array
• Supermassive Binary Black Hole Evolution can be traced by a small SKA Pulsar Timing Array
• Millisecond and Binary Pulsars as Nature's Frequency Standards. III. Fourier Analysis and Spectral Sensitivity of Timing Observations to Low-Frequency Noise
• Stochastic microhertz gravitational radiation from stellar convection