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Status and perspectives of the CRAFTS extra-galactic HI survey

Status and perspectives of the CRAFTS extra-galactic HI survey
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摘要 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 109.5 M⊙. 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. 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 109.5 M⊙. 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.
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2019年第5期52-60,共9页 中国科学:物理学、力学、天文学(英文版)
基金 supported by the National Key R&D Program of China(Grant Nos.2017YFA0402600,and 2016YFA0400702) the National Natural Science Foundation of China(Grant Nos.11690024,11725313,11590783,and 11803051) the International Partnership Program of Chinese Academy of Sciences(Grant No.114A11KYSB20160008) the Young Researcher Grant of National Astronomical Observatories,Chinese Academy of Sciences the CAS "Light of West China" Program
关键词 HI REGIONS and 21-cm lines radio telescopes and instrumentation statistical and correlative studies of properties HI regions and 21-cm lines radio telescopes and instrumentation statistical and correlative studies of properties
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