Limits on the stochastic gravitational wave background from the North American Nanohertz Observatory for Gravitational Waves
MetadataShow full item record
We present an analysis of high-precision pulsar timing data taken as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) project. We have observed 17 pulsars for a span of roughly five years using the Green Bank and Arecibo radio telescopes. We analyze these data using standard pulsar timing models, with the addition of time-variable dispersion measure and frequency-variable pulse shape terms. Sub-microsecond timing residuals are obtained in nearly all cases, and the best rms timing residuals in this set are ~30-50 ns. We present methods for analyzing post-fit timing residuals for the presence of a gravitational wave signal with a specified spectral shape. These optimally take into account the timing fluctuation power removed by the model fit, and can be applied to either data from a single pulsar, or to a set of pulsars to detect a correlated signal. We apply these methods to our data set to set an upper limit on the strength of the nHz-frequency stochastic supermassive black hole gravitational wave background of hc (1 yr–1) < 7 × 10–15 (95%). This result is dominated by the timing of the two best pulsars in the set, PSRs J1713+0747 and J1909–3744.
Showing items related by title, author, creator and subject.
Shannon, Ryan; Cordes, J. (2010)We investigate rotational spin noise (referred to as timing noise) in non-accreting pulsars: millisecond pulsars, canonical pulsars, and magnetars. Particular attention is placed on quantifying the strength and non-stationarity ...
Manchester, R.; Hobbs, G.; Bailes, M.; Coles, W.; van Straten, W.; Keith, M.; Shannon, R.; Bhat, Ramesh; Brown, A.; Burke-Spolaor, S.; Champion, D.; Chaudhary, A.; Edwards, R.; Hampson, G.; Hotan, A.; Jameson, A.; Jenet, F.; Kesteven, M.; Khoo, J.; Kocz, J.; Maciesiak, K.; Oslowski, S.; Ravi, V.; Reynolds, J.; Sarkissian, J.; Verbiest, J.; Wen, Z.; Wilson, W.; Yardley, D.; Yan, W.; You, X. (2013)A ‘pulsar timing array’ (PTA), in which observations of a large sample of pulsars spread across the celestial sphere are combined, allows investigation of ‘global’ phenomena such as a background of gravitational waves or ...
Yardley, D.; Coles, W.; Hobbs, G.; Verbiest, J.; Manchester R. N.; van Straten W.; Jenet F. A.; Bailes M.; Bhat, Ramesh; Burke-Spolaor, S.; Champion, D. J.; Hotan, Aidan; Oslowski, S.; Reynolds, J. E.; Sarkissian, J. M. (2011)We search for the signature of an isotropic stochastic gravitational-wave background in pulsar timing observations using a frequency-domain correlation technique. These observations, which span roughly 12 yr, were obtained ...