中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(5) ：182-199.DOI:10.1007/s11433-023-2333-8

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

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
中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(5) ：182-199.DOI:10.1007/s11433-023-2333-8
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  • 万方数据

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

Yingjie Jing 1Jie Wang 2Chen Xu 3Ziming Liu 3Qingze Chen 3Tiantian Liang 3Jinlong Xu 4Yixian Cao 5Jing Wang 6Huijie Hu 3Chuan-Peng Zhang 4Qi Guo 2Liang Gao 7Mei Ai 8Hengqian Gan 9Xuyang Gao 9Jinlin Han 9Ligang Hou 1Zhipeng Hou 3Peng Jiang 4Xu Kong 10Fujia Li 10Zerui Liu 3Li Shao 1Hengxing Pan 11Jun Pan 12Lei Qian 9Jinghai Sun 1Ningyu Tang 13Qingliang Yang 1Bo Zhang 9Zhiyu Zhang 14Ming Zhu8
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作者信息

  • 1. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China
  • 2. 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
  • 3. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China
  • 4. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;Guizhou Radio Astronomical Observatory,Guizhou University,Guiyang 550000,China
  • 5. Max Planck Institute for Extraterrestrial Physics,Garching 85748,Germany
  • 6. Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China
  • 7. 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;Institute of Computational Cosmology,Department of Physics,University of Durham,Durham DH1 3LE,UK
  • 8. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;Guizhou Radio Astronomical Observatory,Guizhou University,Guiyang 550000,China;CAS Key Laboratory of FAST National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China
  • 9. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;CAS Key Laboratory of FAST National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China
  • 10. 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
  • 11. Astrophysics,Department of Physics,University of Oxford,Oxford OX1 3RH,UK
  • 12. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;College of Earth Sciences,Guilin University of Technology,Guilin 541004,China
  • 13. Department of Physics,Anhui Normal University,Wuhu 241002,China
  • 14. School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China;Key Laboratory of Modern Astronomy and Astrophysics,Nanjing University,Nanjing 210023,China
  • 折叠

Abstract

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.

Key words

radio telescopes and instrumentation/H I regions and 21-cm lines/observation and data reduction techniques/algorithms and implementation

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基金项目

National Key R&D Program of China(2022YFA1602901)

National Natural Science Foundation of China(11988101)

National Natural Science Foundation of China(11873051)

National Natural Science Foundation of China(12125302)

National Natural Science Foundation of China(12373011)

CAS Project for Young Scientists in Basic Research Grant(YSBR-062)

K.C Wong Education Foundation()

science research grants from the China Manned Space Project()

Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS()

出版年

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
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