A pulsar-based timescale from the International Pulsar Timing Array
Abstract
We have constructed a new timescale, TT(IPTA16), based on observations of radio pulsars presented in the first data release from the International Pulsar Timing Array (IPTA). We used two analysis techniques with independent estimates of the noise models for the pulsar observations and different algorithms for obtaining the pulsar timescale. The two analyses agree within the estimated uncertainties and both agree with TT(BIPM17), a post-corrected timescale produced by the Bureau International des Poids et Mesures (BIPM). We show that both methods could detect significant errors in TT(BIPM17) if they were present. We estimate the stability of the atomic clocks from which TT(BIPM17) is derived using observations of four rubidium fountain clocks at the US Naval Observatory. Comparing the power spectrum of TT(IPTA16) with that of these fountain clocks suggests that pulsar-based timescales are unlikely to contribute to the stability of the best timescales over the next decade, but they will remain a valuable independent check on atomic timescales. We also find that the stability of the pulsar-based timescale is likely to be limited by our knowledge of solar-system dynamics, and that errors in TT(BIPM17) will not be a limiting factor for the primary goal of the IPTA, which is to search for the signatures of nano-Hertz gravitational waves.
Keywords
Cite
@article{arxiv.1910.13628,
title = {A pulsar-based timescale from the International Pulsar Timing Array},
author = {G. Hobbs and L. Guo and R. N. Caballero and W. Coles and K. J. Lee and R. N. Manchester and D. J. Reardon and D. Matsakis and M. L. Tong and Z. Arzoumanian and M. Bailes and C. G. Bassa and N. D. R. Bhat and A. Brazier and S. Burke-Spolaor and D. J. Champion and S. Chatterjee and I. Cognard and S. Dai and G. Desvignes and T. Dolch and R. D. Ferdman and E. Graikou and L. Guillemot and G. H. Janssen and M. J. Keith and M. Kerr and M. Kramer and M. T. Lam and K. Liu and A. Lyne and T. J. W. Lazio and R. Lynch and J. W. McKee and M. A. McLaughlin and C. M. F. Mingarelli and D. J. Nice and S. Oslowski and T. T. Pennucci and B. B. P. Perera and D. Perrodin and A. Possenti and C. J. Russell and S. Sanidas and A. Sesana and G. Shaifullah and R. M. Shannon and J. Simon and R. Spiewak and I. H. Stairs and B. W. Stappers and J. K. Swiggum and S. R. Taylor and G. Theureau and L. Toomey and R. van Haasteren and J. B. Wang and Y. Wang and X. J. Zhu},
journal= {arXiv preprint arXiv:1910.13628},
year = {2020}
}
Comments
accepted by MNRAS