Vol 21, No 5 (2021) / Han

The FAST Galactic Plane Pulsar Snapshot survey: I. Project design and pulsar discoveries

J. L. Han, Chen Wang, P. F. Wang, Tao Wang, D. J. Zhou, Jing-Hai Sun, Yi Yan, Wei-Qi Su, Wei-Cong Jing, Xue Chen, X. Y. Gao, Li-Gang Hou, Jun Xu, K. J. Lee, Na Wang, Peng Jiang, Ren-Xin Xu, Jun Yan, Heng-Qian Gan, Xin Guan, Wen-Jun Huang, Jin-Chen Jiang, Hui Li, Yun-Peng Men, Chun Sun, Bo-Jun Wang, H. G. Wang, Shuang-Qiang Wang, Jin-Tao Xie, Heng Xu, Rui Yao, Xiao-Peng You, D. J. Yu, Jian-Ping Yuan, Rai Yuen, Chun-Feng Zhang, Yan Zhu


Discovery of pulsars is one of the main goals for large radio telescopes. The Five-hundredmeter Aperture Spherical radio Telescope (FAST), that incorporates an L-band 19-beam receiver with a system temperature of about 20 K, is the most sensitive radio telescope utilized for discovering pulsars. We designed the snapshot observation mode for a FAST key science project, the Galactic Plane Pulsar Snapshot (GPPS) survey, in which every four nearby pointings can observe a cover of a sky patch of 0.1575 square degrees through beam-switching of the L-band 19-beam receiver. The integration time for each pointing is 300 seconds so that the GPPS observations for a cover can be made in 21 minutes. The goal of the GPPS survey is to discover pulsars within the Galactic latitude of ±10\(^\circ\) from the Galactic plane, and the highest priority is given to the inner Galaxy within ±5\(^\circ\). Up to now, the GPPS survey has discovered 201 pulsars, including currently the faintest pulsars which cannot be detected by other telescopes, pulsars with extremely high dispersion measures (DMs) which challenge the currently widely used models for the Galactic electron density distribution, pulsars coincident with supernova remnants, 40 millisecond pulsars, 16 binary pulsars, some nulling and mode-changing pulsars and rotating radio transients (RRATs). The follow-up observations for confirmation of new pulsars have polarization-signals recorded for polarization profiles of the pulsars. Re-detection of previously known pulsars in the survey data also leads to significant improvements in parameters for 64 pulsars. The GPPS survey discoveries are published and will be updated at http://zmtt.bao.ac.cn/GPPS/.


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DOI: https://doi.org/10.1088/1674-4527/21/5/107


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