Wideband timing of the Parkes Pulsar Timing Array UWL data

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Małgorzata Curyło Timothy T. Pennucci Matthew Bailes N. D. Ramesh Bhat Andrew D. Cameron Shi Dai George Hobbs Agastya Kapur Richard N. Manchester Rami Mandow Matthew T. Miles Christopher J. Russell Daniel J. Reardon Ryan M. Shannon Renée Spiewak Andrew Zic Xing-Jiang Zhu

摘要： In 2018 an ultra-wide-bandwidth low-frequency (UWL) receiver was installed on the 64-m Parkes Radio Telescope enabling observations with an instantaneous frequency coverage from 704 to 4032 MHz. Here, we present the analysis of a three-year data set of 35 millisecond pulsars observed with the UWL by the Parkes Pulsar Timing Array (PPTA), using wideband timing methods. The two key differences compared to typical narrow-band methods are, firstly, generation of two-dimensional templates accounting for pulse shape evolution with frequency and, secondly, simultaneous measurements of the pulse time-of-arrival (ToA) and dispersion measure (DM). This is the first time that wideband timing has been applied to a uniform data set collected with a single large-fractional bandwidth receiver, for which such techniques were originally developed. As a result of our study, we present a set of profile evolution models and new timing solutions including initial noise analysis. Precision of our ToA and DM measurements is in the range of 0.005 $-$ 2.08 $\mu$s and (0.043$-$14.24)$\times10^{-4}$ cm$^{-3}$ pc, respectively, with 94% of the pulsars achieving a median ToA uncertainty of less than 1 $\mu$s.

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