发稿时间:2021-04-05浏览次数:10

USTC Astronomy Colloquium Series: 2021 Spring
FAST银道面脉冲星巡天:策略和最新结果
韩金林  研究员
国家天文台
2021/4/6, 4:00pm , the 19th-floor Observatory Hall
报告人:
韩金林教授,于1986年获得南京工学院(现东南大学)学士学位,1989年获得上海天文台硕士学位,1993年获得北京天文台(现国家天文台)博士学位,现任中国科学院国家天文台首席研究员。韩金林教授的主要研究领域涵盖银河系磁场、脉冲星、活动星系核、星系以及星系团。韩金林教授是恒星际和星系际磁场观测研究的世界著名专家,于2000年获国家自然科学杰出青年基金,2006年获国家自然科学二等奖,2016年入选国家“万人计划”领军人才。
摘要:
Discovery of pulsars is one of main goals for large radio telescopes. The Five-hundred-meter Aperture Spherical radio Telescope(FAST) had 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 20K,it is the most sensitive radio telescope to discover pulsars. We designed the snapshot observation mode for beam-switching of the 19-beam receiver to observe a cover of a sky area of 0.15 square degree by four pointings, and carry out 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. Up to now, observations of about 250 hours result in discoveries of 190 pulsars. In addition, 30 fast radio bursts not associated with any pulsars have been detected. The follow-up confirmation observations of new pulsars with polarization-signals recorded produce good polarization profiles for strong pulsars, from which the Faraday rotation can be measured and hence the interstellar magnetic fields in far spiral arms in the first Galactic quadrant are probed. Re-detection of known pulsars in the survey data also leads significant improvements of pulsar parameters, and emission properties of some pulsars are revealed by the GPPS sensitive observations. The GPPS survey results are published and will be updated in http://zmtt.bao.ac.cn/GPPS/.