综合脉冲星时研究进展

doi:10.7527/S1000-6893.2022.26443

Abstract

Abstract:

Now generalized least square fitting and a Bayesian approach to pulsar timing analysis are successfully used. An introduction on these two methods for pulsar timing analysis is provided. Up to today， three kinds of algorithms of constructing an ensemble pulsar time-scale using millisecond pulsar timing data were developed， which were the generalized least square fitting algorithm， the Bayesian analysis technology and the optimal Wiener filtration. We describe the above three algorithms in some details， and show some derived representative results on Ensemble Pulsar Time-scale （EPT） already published and results that we recently derived using improved Wiener filtration from International Pulsar Timing Array （IPTA） data release 2. All the results showed here indicate that the EPT with respect to the International Atomic Time scale （TAI） detected correctly the systematic errors in the TAI. Frequency stability analysis for the ensemble pulsar time-scale EPT-TAI we developed， as an example， indicates that the frequency stability on 8 year and longer time intervals show a little better secular stability than the TT-TAI. The TT-TAI is difference between Terrestrial Time scale （TT） and TAI. Quadratic term in the TT-TAI is removed to make a comparison with pulsar time-scale. Based on the frequency stability analysis， It is clear that TT-TAI shows some red noise， while there is no red noise detected in the EPT-TAI. Finally， we summarize the three algorithms on constructing an ensemble pulsar time scale. The question on improving short time interval stability of pulsar time-scale is discussed. Some preliminary conclusions on EPT research work are given.

Key words: astrometry, time scale, millisecond pulsar, pulsar timing array, pulsar time-scale

CLC Number:

Tinggao YANG, Yuping GAO, Minglei TONG, Bian LI, Chengshi ZHAO, Jintao LUO, Xingzhi ZHU, Fei WEI. Review on research progress of ensemble pulsar time-scale[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(3): 526443-526443.

Figures/Tables 3

References 53

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Review on research progress of ensemble pulsar time-scale

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