首页|HiFAST:An H i data calibration and imaging pipeline for FAST

HiFAST:An H i data calibration and imaging pipeline for FAST

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The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has the largest aperture and a 19-beam L-band receiver,making it powerful for investigating the neutral hydrogen atomic gas(H i)in the universe.We present HiFAST(https://hifast.readthedocs.io),a dedicated,modular,and self-contained calibration and imaging pipeline for processing the H i data of FAST.The pipeline consists of frequency-dependent noise diode calibration,baseline fitting,standing wave removal using an FFT-based method,flux density calibration,stray radiation correction,and gridding to produce data cubes.These modules can be combined as needed to process the data from most FAST observation modes:tracking,drift scanning,On-The-Fly mapping,and most of their variants.With HiFAST,the root-mean-square(RMS)noises of the calibrated spectra from all 19 beams were only slightly(~5%)higher than the theoretical expectation.The results for the extended source M33 and the point sources are consistent with the results from Arecibo.The moment maps(0,1 and 2)of M33 agree well with the results from the Arecibo Galaxy Environment Survey(AGES)with a fractional difference of less than 10%.For a common sample of 221 sources with signal-to-noise ratio S/N>10 from the Arecibo Legacy Fast ALFA(ALFALFA)survey,the mean value of fractional difference in the integrated flux density,S int,between the two datasets is approximately 0.005%,with a dispersion of 15.4%.Further checks on the integrated flux density of 23 sources with seven observations indicate that the variance in the flux density of the source with luminous objects(Sint>2.5 Jy km s-1)is less than 5%.Our tests suggest that the FAST telescope,with the efficient,precise,and user-friendly pipeline HiFAST,will yield numerous significant scientific findings in the investigation of the H I in the universe.

radio telescopes and instrumentationH I regions and 21-cm linesobservation and data reduction techniquesalgorithms and implementation

Yingjie Jing、Jie Wang、Chen Xu、Ziming Liu、Qingze Chen、Tiantian Liang、Jinlong Xu、Yixian Cao、Jing Wang、Huijie Hu、Chuan-Peng Zhang、Qi Guo、Liang Gao、Mei Ai、Hengqian Gan、Xuyang Gao、Jinlin Han、Ligang Hou、Zhipeng Hou、Peng Jiang、Xu Kong、Fujia Li、Zerui Liu、Li Shao、Hengxing Pan、Jun Pan、Lei Qian、Jinghai Sun、Ningyu Tang、Qingliang Yang、Bo Zhang、Zhiyu Zhang、Ming Zhu

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National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China

Institute for Frontiers in Astronomy and Astrophysics,Beijing Normal University,Beijing 102206,China

School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

Guizhou Radio Astronomical Observatory,Guizhou University,Guiyang 550000,China

Max Planck Institute for Extraterrestrial Physics,Garching 85748,Germany

Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China

Institute of Computational Cosmology,Department of Physics,University of Durham,Durham DH1 3LE,UK

CAS Key Laboratory of FAST National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

Deep Space Exploration Laboratory/Department of Astronomy,University of Science and Technology of China,Hefei 230026,China

School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

Astrophysics,Department of Physics,University of Oxford,Oxford OX1 3RH,UK

College of Earth Sciences,Guilin University of Technology,Guilin 541004,China

Department of Physics,Anhui Normal University,Wuhu 241002,China

School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China

Key Laboratory of Modern Astronomy and Astrophysics,Nanjing University,Nanjing 210023,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaCAS Project for Young Scientists in Basic Research GrantK.C Wong Education Foundationscience research grants from the China Manned Space ProjectCultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS

2022YFA160290111988101118730511212530212373011YSBR-062

2024

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子:0.91
ISSN:1674-7348
年,卷(期):2024.67(5)