Cheng-Shi Zhao's research while affiliated with Chinese Academy of Sciences and other places
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Publications (10)
The establishment of pulsar space–time reference frame is of great significance for X‐ray pulsar deep space navigation. To demonstrate that the pulsar parameters are accurate enough to be used as a spatial reference, the transformation parameters, that is, α, β, and γ, of different reference frames determined based on pulsar timing are shown and co...
Pulsars are very stable spinning stars, which have the potential to application in the work of time-keeping and autonomous navigation in deep space. For time application, an individual pulsar can be regarded as a clock. The accuracy and stability of a pulsar clock are mainly determined by various timing noises and the measurement errors; however, t...
We report pulsar timing observations carried out in L -band with NTSC’s 40-meter Haoping Radio Telescope (HRT), which was constructed in 2014. These observations were carried out using the pulsar machine we developed. Timing observations toward millisecond pulsar J0437–4715 obtain a timing residual (r.m.s.) of 397 ns in the time span of 284 days. O...
Employing multiple pulsars and using an appropriate algorithm to establish ensemble pulsar timescale can reduce the influences of various noises on the long-term stability of pulsar timescale, compared to a single pulsar. However, due to the low timing precision and significant red noises of some pulsars, their participation in the construction of...
Employing multiple pulsars and using an appropriate algorithm to establish ensemble pulsar timescale can reduce the influences of various noises on the long-term stability of pulsar timescale, compared to a single pulsar. However, due to the low timing precision and the significant red noises of some pulsars, their participation in the construction...
Millisecond pulsars have a very high rotation stability, which can be applied to many research fields, such as the establishment of the pulsar time standard, the detection of gravitational wave, the spacecraft navigation by using X-ray pulsars and so on. In this paper, we employ two millisecond pulsars PSR J0437-4715 and J1713+0743, which are obser...
Relic gravitational waves (RGWs) , a background originated during inflation,
would give imprints on the pulsar timing residuals. This makes RGWs be one of
important sources for detection using the method of pulsar timing. In this
paper, we discuss the effects of RGWs on the single pulsar timing, and give
quantitively the timing residuals caused by...
- [...]
In the non-standard model of relic gravitational waves (RGWs) generated in
the early universe, the theoretical spectrum of is mainly described by an
amplitude $r$ and a spectral index $\beta$, the latter usually being determined
by the slope of the inflation potential. Pulsar timing arrays (PTAs) data have
imposed constraints on the amplitude of st...
The pulsar timing residuals induced by gravitational waves from non-evolving
single binary sources are affected by many parameters related to the relative
positions of the pulsar and the gravitational wave sources. We will fully
analyze the effects due to different parameters one by one. The standard
deviations of the timing residuals will be calcu...
The pulsar timing residuals induced by gravitational waves from non-evolving
single binary sources with general elliptical orbits will be analyzed. For
different orbital eccentricities, the timing residuals present different
properties. The standard deviations of the timing residuals induced by a fixed
gravitational wave source will be calculated f...
Citations
... Te Haoping Observatory of the National Service Center of the Chinese Academy of Sciences is in Luonan, Shaanxi Province. It has a 40 m aperture refector antenna ( Figure 6), which is mainly used to track and receive downlink signals from GNSS (Global Navigation Satellite System) satellites to achieve high GNSS satellite signal accuracy in observation International Journal of Antennas and Propagation and analysis [20], and will also be used to carry out radio astronomy observations such as pulsars and spectral lines etc. [21], and VLBI work is also planned in the future [22]. At present, based on the radio telescope, research on the time scale of pulsars is being carried out, and long-term timing observations have been carried out on many high-precision millisecond pulsars. ...
... The conclusions of Eq.(17) are such that if we look at the value of h, i.e. strain, as given by Tong, Zhang Zhao, Liu, Zhao, and Yang [9] , the following becomes a possibility, namely for a strain, one has an inversion of contributions from N contributing universes, in a multiverse generalization of the Penrose hypothesis, will lead to , if we look at ...
... As a SMBH binary system, OJ 287 is also a candidate gravitational wave (GW) source. In our previous works, Wu, Zhang & Fu (2012), Zhang, Wu & Zhao (2013), Tong et al. (2013) and Cheng & Zhang (2015), the GW strain of OJ 287 was evaluated in the post-Newtonian (PN) approximation, i.e. assuming that it has a frequency of 10 −9 Hz and an amplitude of 10 −16 . The nanoHertz (nHz) frequency of the GW is not in the bands of ground-based and spacebased laser interferometers such as the advanced Laser Interferometer Gravitational-wave Observatory (aLIGO) (Harry 2010;Aasi et al. 2015), the advanced Virgo interferomter (advanced Virgo) E-mail: chjw@mail.ustc.edu.cn ...
