Sunday, 25 September 2022

Astronomy Colloquium (1.6/2022):The FAST Galactic Plane Pulsar Snapshot survey

06.01.2022 2:00 pm - 3:00 pm


Title: The FAST Galactic Plane Pulsar Snapshot survey
Speaker:  JinLin Han (韩金林)
Discovery of pulsars is one of main goals for large radio telescopes. The Five-hundred-meter Aperture Spherical radio
Tetelscope (FAST) has the largest collecting area for radio waves, with an aperture of 300~m in diameter. Mounted with the
19-beam L-band receiver with a system temperature of about 20 K, it is the most sensitive radio telescope to discover pulsars. We carefully designed the {\it snapshot} observation mode for beam-switching of the 19-beam receiver to observe {\it a cover} of a sky area of 0.15 square degree by four pointings, and carry out the the Galactic Plane Pulsar Snapshot (GPPS) survey. The integration  time for each pointing is 300, so that the GPPS observations for a cover can be made in 21 minutes. The goal of the GPPS survey is  to discover pulsars first within 5 degree of the Galactic  latitudes from the Galactic plane and later to 10 degree. After very dedicated development and updating of data processing pipeline and a huge amount of extensive processing, we have discovered 415 pulsars, including 100 millisecond pulsars, several Fast Radio Bursts, much exceeding  the discoveries by the Arecibo telescope over last 20 years! In the mean time, we obtained the spectral line data which provide deep insights into the interstellar medium. The GPPS survey results will be updated in  (already 279 pulsars there).
JinLin Han (National Astronomical Observatories, Chinese Academy of Sciences)
He obtained the Bachelor degree of Engineering in 1986 from Southeast University (Nanjng Institute of Techonology), and then went to Shanghai Observatory, Chinese Academy of Science to make his Master degree of Science. In 1989, he moved to Beijing Astronomical Observatory, Chinese Academy of Sciences to be a PhD student, and got PhD degree in 1993.  After then he has been working in National Astronomical Observatories of China for about 30 years already.
Prof. JinLin Han is world famous expert on the interstellar and intergalactic magnetic fields as he pioneered this research area. He revealed the global magnetic field structure for the Milky Way including the magnetic torus in the halo and the disk field along spiral arms, and obtained the first, and still the state of art, spatial magnetic energy spectrum on galactic scales. These results are fundamental for many related research areas. In last two decades, he spent a lot of energy to educate radio astronomy and pulsar astronomy in China. He observed pulsars by using many international telescopes (e.g. Parkes, GBT) and also domestic telescopes (JMS 66m). Many results have been cited by world famous textbook "Pulsar Astronomy". After the FAST was built and started to operate, he proposed and now is chairing the FAST Galactic Plane Pulsar Snapshot survey.
[1]  J. L. Han et al. RAA, Vol.21, No.5, 107
Time:14:00-15:00PM, 1/June, Wednesday
Meeting ID: 831 4360 9634
Passcode: 436377
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