China News Service, Beijing, February 24 (Reporter Sun Zifa) The reporter learned from the National Astronomical Observatory of the Chinese Academy of Sciences on the 24th that the 500-meter spherical radio telescope (FAST) known as the "China Sky Eye" has made two new discoveries, including the capture of three Examples of new high-dispersion fast radio bursts (FRB) and the first discovery of a millisecond pulsar called jitter timing noise mode.
According to the National Astronomical Observatory of the Chinese Academy of Sciences, a fast radio burst is a mysterious cosmic radio signal that lasts about one-thousandth of a second. Its cosmological origin has been confirmed for less than 5 years. It contains great potential to promote astrophysics research. It is currently observed. The main hot frontiers in the field of astronomy.
Recently, the team of Dr. Niu Chenhui from the research team of the National Astronomical Observatory's Li Dan and Zhu Weiwei searched out three new high-dispersion fast radio bursts from the massive data of FAST, and carried out research based on the results of FAST's first new fast radio burst published in 2020. With FAST's high sensitivity, up to 120,000 fast radio bursts can be detected per day, which will effectively expand the redshift-brightness coverage area of fast radio burst samples, reveal the composition of the universe and constrain the intrinsic luminosity function of fast radio bursts.
Dr. Niu Chenhui’s team stated that previously, Dr. Shannon of Australia and others have compared and analyzed the rapid radio burst samples of the Parkes telescope and the Australian square kilometer pilot array and found that the flux flux and dispersion of the rapid radio storm have a certain relationship.
Based on the FAST priority and the major project "Multi-Science Target Drift Scanning Sky Survey" data, these three new fast radio storm events have the characteristics of low flow flux and high dispersion value, filling the flow rate of fast radio bursts. The blanks in the phase diagram of quantity and dispersion, and the supplementary verification of the anti-correlation between the two, will hopefully unveil the mystery of such fast radio bursts.
This important astronomy paper has been accepted by the international professional academic journal "American Astrophysical Journal Letters" (ApJL).
The timing residuals of one thousand single pulses of J1022+1001, the timing residuals are hierarchical, and the jitter existence pattern of this millisecond pulsar.
Photo courtesy of the National Astronomical Observatory of the Chinese Academy of Sciences
Another new achievement of "China Sky Eye" is the first discovery of the jitter noise pattern of millisecond pulsars. It was completed by Feng Yi, a PhD student at the National Astronomical Observatory of the Chinese Academy of Sciences, and his supervisor, Researcher Li Di, in collaboration with a research team from Australia. Published in the Astrophysical Journal.
According to reports, FAST is currently the most sensitive single-aperture radio telescope in the world. It reduces the jitter noise of millisecond pulsars in the pulsar timing array and can significantly improve FAST's ability to detect nanohertz gravitational waves.
Taking advantage of the high sensitivity of FAST, Feng Yi et al. found the jitter noise pattern of the millisecond pulsar for the first time by analyzing the single pulse of the millisecond pulsar numbered J1022+1001.
The cooperative team said that further analysis and use of this jitter mode is expected to improve the timing accuracy of the pulsar timing array, thereby accelerating the detection of NHz gravitational waves.
This signifies that FAST has the potential to better detect NHz gravitational waves, and is expected to lead the research and make major breakthroughs in the field of NHz gravitational waves in the future.
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