Peering into the Milky Way by FAST:Ⅰ.Exquisite HI structures in the inner Galactic disk from the piggyback line observations of the FAST GPPS survey  

作　　者：Tao Hong JinLin Han LiGang Hou XuYang Gao Chen Wang Tao Wang 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing,100101,China [2]School of Astronomy,University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第12期3-17,共15页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11988101,11933011,and 11833009);the National Key R&D Program of China(Grant No.2017YFA0402701);the Key Research Program of the Chinese Academy of Sciences(Grant No.QYZDJ-SSW-SLH021);the National SKA Program of China(Grant No.2022SKA0120103);supported by the National Natural Science Foundation of China(Grant No.12003044);the support from the Youth Innovation Promotion Association CAS;the support by the CAS-NWO Cooperation Programme(Grant No.GJHZ1865);the National Natural Science Foundation of China(Grant No.U1831103);supported by the National Natural Science Foundation of China(Grant No.12133004)。

摘　　要：Neutral hydrogen(Hi)is the fundamental component of the interstellar medium.The Galactic Plane Pulsar Snapshot(GPPS)survey is designed for hunting pulsars by using the Five-hundred-meter Aperture Spherical radio Telescope(FAST)from the visible Galactic plane within|b|≤10°.The survey observations are conducted with the L-band 19-beam receivers in the frequency range of 1.0-1.5 GHz,and each pointing has an integration time of 5 min.The piggyback spectral data simultaneously recorded during the FAST GPPS survey are great resources for studies on the Galactic Hi distribution and ionized gas.We process the piggyback Hi data of the FAST GPPS survey in the region of 33°≤l≤55°and|b|≤2°.The rms of the data cube is found to be approximately 40 m K at a velocity resolution of 0.1 km s^(-1),placing it the most sensitive observations of the Galactic Hi by far.The high velocity resolution and high sensitivity of the FAST GPPS Hi data enable us to detect weak exquisite Hi structures in the interstellar medium.Hi absorption line with great details can be obtained against bright continuum sources.The FAST GPPS survey piggyback Hi data cube will be released and updated on the web:http://zmtt.bao.ac.cn/Milky Way FAST/.

关 键 词：interstellar medium ATOMS radio lines surveys 

分 类 号：P156[天文地球—天文学]