首页|HiFAST:An HI Data Calibration and Imaging Pipeline for FAST.Ⅱ.Flux Density Calibration

HiFAST:An HI Data Calibration and Imaging Pipeline for FAST.Ⅱ.Flux Density Calibration

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Accurate flux density calibration is essential for precise analysis and interpretation of observations across different observation modes and instruments.In this research,we first introduce the flux calibration model that incorporated in HiFAST pipeline,and designed for processing Hl 21cm spectra.Furthermore,we investigate different calibration techniques and assess the dependence of the gain parameter on the time and environmental factors.A comparison is carried out in various observation modes(e.g.,tracking and scanning modes)to determine the flux density gain(G),revealing insignificant discrepancies in G among different methods.Long-term monitoring data shows a linear correlation between G and atmospheric temperature.After subtracting the G-Temperature dependence,the dispersion of G is reduced to＜3％over a one-year timescale.The stability of the receiver response of Five-hundred-meter Aperture Spherical radio Telescope(FAST)is considered sufficient to facilitate HI observations that can accommodate a moderate error in flux calibration(e.g.,＞～5％)when utilizing a constant G for calibration purposes.Our study will serve as a useful addition to the results provided by Jiang et al.Detailed measurement of G for the 19 beams of FAST,covering the frequency range 1000-1500 MHz,can be found on the HiFAST homepage:https://hifast.readthedocs.io/fluxgain.

telescopestechniques:image processingmethods:observationalradio continuum:galaxiescosmology:observations

Ziming Liu、Jie Wang、Yingjie Jing、Zhi-Yu Zhang、Chen Xu、Tiantian Liang、Qingze Chen、Ningyu Tang、Qingliang Yang

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National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

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

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

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

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

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

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China National Key Program for Science and Technology Research and Development of ChinaChina National Key Program for Science and Technology Research and Development of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation 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

2022YFA16029012023YFA1608204119881011187305112125302123730111204130512173016YSBR-062

2024

10.1088/1674-4527/ad5398

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(8)