Improving Pulsar Timing Precision with Single Pulses
arXiv:1506.03527 · doi:10.1093/mnras/stv1296
Abstract
The measurement error of pulse times of arrival (TOAs) in the high S/N limit is dominated by the quasi-random variation of a pulsar's emission profile from rotation to rotation. Like measurement noise, this noise is only reduced as the square root of observing time, posing a major challenge to future pulsar timing campaigns with large aperture telescopes, e.g. the Five-hundred-metre Aperture Spherical Telescope and the Square Kilometre Array. We propose a new method of pulsar timing that attempts to approximate the pulse-to-pulse variability with a small family of 'basis' pulses. If pulsar data are integrated over many rotations, this basis can be used to measure sub-pulse structure. Or, if high-time resolution data are available, the basis can be used to 'tag' single pulses and produce an optimal timing template. With realistic simulations, we show that these applications can dramatically reduce the effect of pulse-to-pulse variability on TOAs. Using high-time resolution data taken from the bright PSR J0835-4510 (Vela), we demonstrate a 25-40% improvement in TOA precision. Crucially for pulsar timing applications, we further establish that these techniques produce TOAs with gaussian residuals. Improvements of this level halve the telescope time required to reach a desired TOA precision. Although some gains can be achieved with existing data, the greatest improvements result from the 'tagging' approach, which in turn requires online or posthoc analysis of single pulses, an important consideration for the design of future instrumentation.
10 pages, 10 figures, accepted to MNRAS; v2 fixed references
References in corpus (26)
- Shapiro delay measurement of a two solar mass neutron star
- A Massive Pulsar in a Compact Relativistic Binary
- The Physics of Neutron Stars
- DSPSR: Digital Signal Processing Software for Pulsar Astronomy
- Switched magnetospheric regulation of pulsar spin-down
- A periodically active pulsar giving insight into magnetospheric physics
- The Parkes Pulsar Timing Array Project
- Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves
- A millisecond pulsar in a stellar triple system
- An analysis of the timing irregularities for 366 pulsars
- Assessing the Role of Spin Noise in the Precision Timing of Millisecond Pulsars
- Measurement and correction of variations in interstellar dispersion in high-precision pulsar timing
- Gravitational-wave Limits from Pulsar Timing Constrain Supermassive Black Hole Evolution
- Synchronous X-ray and Radio Mode Switches: a Rapid Global Transformation of the Pulsar Magnetosphere
- Limitations in timing precision due to single-pulse shape variability in millisecond pulsars
- The High Time Resolution Universe Survey - V: Single-pulse energetics and modulation properties of 315 pulsars
- High time-resolution observations of the Vela pulsar
- Radio Astronomical Polarimetry and Point-Source Calibration
- High-fidelity radio astronomical polarimetry using a millisecond pulsar as a polarized reference source
- High signal-to-noise ratio observations and the ultimate limits of precision pulsar timing
- Intrinsic Variability of the Vela Pulsar: Lognormal Statistics and Theoretical Implications
- On detection of the stochastic gravitational-wave background using the Parkes pulsar timing array
- Properties and Interpretations of Giant Micropulses and Giant Pulses from Pulsars
- Timing, polarimetry and physics of the bright, nearby millisecond pulsar PSR J0437-4715 - a single-pulse perspective
- Improving the precision of pulsar timing through polarization statistics
- Noise and Signal for Spectra of Intermittent Noiselike Emission