Noise Budget and Interstellar Medium Mitigation Advances in the NANOGrav Pulsar Timing Array

Abstract

Gravitational wave (GW) detection with pulsar timing arrays (PTAs) requires accurate noise characterization. The noise of our Galactic-scale GW detector has been systematically evaluated by the Noise Budget and Interstellar Medium Mitigation working groups within the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration. Intrinsically, individual radio millisecond pulsars (MSPs) used by NANOGrav can have some degree of achromatic red spin noise, as well as white noise due to pulse phase jitter. Along any given line-of-sight, the ionized interstellar medium contributes chromatic noise through dispersion measure (DM) variations, interstellar scintillation, and scattering. These effects contain both red and white components. In the future, with wideband receivers, the effects of frequency-dependent DM will become important. Having anticipated and measured these diverse sources of detector noise, the NANOGrav PTA remains well-poised to detect low-frequency GWs.

Publisher

IOP Publishing

Publication Date

1-1-2018

Publication Title

Journal of Physics: Conference Series

Department

Physics and Astronomy

Document Type

Article

DOI

https://dx.doi.org/10.1088/1742-6596/957/1/012007

Language

English

Format

text

Link to Full Text

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