分类： 地球科学 >> 空间物理学 提交时间： 2016-12-22
G. Hobbs
W. Coles
R. N. Manchester
M. J. Keith,1 R. M. Shannon
D. Chen
M. Bailes,4 N. D. R. Bhat
S. Burke-Spolaor
D. Champion
A. Chaudhary
A. Hotan
J. Khoo,1 J. Kocz
Y. Levin
S.Oslowski
B. Preisig
V. Ravi
J. E. Reynolds
J. Sarkissian
W. van Straten
J. P. W. Verbiest
D. Yardley
摘要： Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in international atomic timescales. Our ensemble of pulsars provides an Ensemble Pulsar Scale (EPS) analogous to the free atomic timescale 碋chelle Atomique Libre (EAL). The EPS can be used to detect fluctuations in atomic timescales and therefore can lead to a new realisation of Terrestrial Time, TT(PPTA11). We successfully follow features known to affect the frequency of the International Atomic Timescale (TAI) and we find marginally significant differences between TT(PPTA11) and TT(BIPM11). We discuss the various phenomena that lead to a correlated signal in the pulsar timing residuals and therefore limit the stability of the pulsar timescale.
分类： 地球科学 >> 空间物理学 提交时间： 2016-12-01
G. Hobbs
W. Coles
R. N. Manchester
M. J. Keith,1 R. M. Shannon
D. Chen
M. Bailes,4 N. D. R. Bhat
S. Burke-Spolaor
D. Champion
A. Chaudhary
A. Hotan
J. Khoo,1 J. Kocz
Y. Levin
S.Oslowski
B. Preisig
V. Ravi
J. E. Reynolds
J. Sarkissian
W. van Straten
J. P. W. Verbiest
D. Yardley
摘要： Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in international atomic timescales. Our ensemble of pulsars provides an Ensemble Pulsar Scale (EPS) analogous to the free atomic timescale 碋chelle Atomique Libre (EAL). The EPS can be used to detect fluctuations in atomic timescales and therefore can lead to a new realisation of Terrestrial Time, TT(PPTA11). We successfully follow features known to affect the frequency of the International Atomic Timescale (TAI) and we find marginally significant differences between TT(PPTA11) and TT(BIPM11). We discuss the various phenomena that lead to a correlated signal in the pulsar timing residuals and therefore limit the stability of the pulsar timescale.
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