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Status and perspectives of the CRAFTS extra-galactic HI survey

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  • Special Topic: The Science and Technology of FAST
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Abstract

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is expected to complete its commissioning in 2019. FAST will soon begin the Commensal Radio Astronomy FasT Survey (CRAFTS), a novel and unprecedented commensal drift scan survey of the entire sky visible from FAST. The goal of CRAFTS is to cover more than 20000 deg2 and reach redshift up to about 0.35. We provide empirical measurements of the beam size and sensitivity of FAST across the 1.05 to 1.45 GHz frequency range of the FAST L-band array of 19-beams (FLAN). Using a simulated HI-galaxy catalogue based on the HI Mass Function (HIMF), we estimate the number of galaxies that CRAFTS may detect. At redshifts below 0.35, over 6 × 105 HI galaxies may be detected. Below the redshift of 0.07, the CRAFTS HIMF will be complete above a mass threshold of 109.5M⊙. FAST will be able to investigate the environmental and redshift dependence of the HIMF to an unprecedented depth, shedding light onto the missing baryon and missing satellite problems.

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Authors and Affiliations

  1. National Astronomical Observatories, Chinese Academy of Sicences, Beijing, 100101, China

    Kai Zhang, JingWen Wu, Di Li, Marko Krčo, NingYu Tang, Lei Qian, MengTing Liu, ChengJin Jin, YouLing Yue, Yan Zhu, HongFei Liu, DongJun Yu, JingHai Sun, GaoFeng Pan, Hui Li, HengQian Gan & Rui Yao

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Kai Zhang, JingWen Wu, Di Li & MengTing Liu

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

    Kai Zhang, JingWen Wu, Di Li, Marko Krčo, NingYu Tang, Lei Qian, MengTing Liu, ChengJin Jin, YouLing Yue, Yan Zhu, HongFei Liu, DongJun Yu, JingHai Sun, GaoFeng Pan, Hui Li, HengQian Gan & Rui Yao

  4. International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, Perth, 6907, Australia

    Lister Staveley-Smith

  5. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), The University of Western Australia, Perth, 6907, Australia

    Lister Staveley-Smith

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  1. Kai Zhang
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Correspondence to Kai Zhang, JingWen Wu or Di Li.

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Zhang, K., Wu, J., Li, D. et al. Status and perspectives of the CRAFTS extra-galactic HI survey. Sci. China Phys. Mech. Astron. 62, 959506 (2019). https://doi.org/10.1007/s11433-019-9383-y

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