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An HI intensity mapping survey with a Phased Array Feed

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Research in Astronomy and Astrophysics 2021年第2期21卷 41-51页

作者： Lin-Cheng Li lister staveley-smith Jonghwan Rhee National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China International Centre for Radio Astronomy Research(ICRAR) The University of Western Australia35 Stirling HwyCrawleyWA6009Australia ARC Centre of Excellence for All-sky Astrophysics(CAASTRO) Perth6009Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions(ASTRO 3D) Perth6009Australia

We report results from a neutral hydrogen(H I)intensity mapping survey conducted with a Phased Array Feed(PAF)on the Parkes *** survey was designed to cover 380 deg^(2)over the redshift range 0.3=1.32±0.42 m K(statistical errors only).A future Parkes cryogenic PAF is expected to detect the cross-correlation signal with higher accuracy than previously possible and allow measurement of the cosmic H I density at redshifts up to unity.

关键词： cosmology observation-methods statistical-radio lines galaxy

Status and perspectives of the CRAFTS extra-galactic HI survey

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Science China(Physics,Mechanics & Astronomy) 2019年第5期62卷 52-60页

作者： Kai Zhang JingWen Wu Di Li Marko Krco lister staveley-smith 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 FAST Collaboration National Astronomical Observatories Chinese Academy of SicencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of FAST National Astronomical Obserx'atoriesChinese Academy of SciencesBeijing 100101China International Centre for Radio Astronomy Research (ICRAR) The University1 of Western AustraliaPerth 6907Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) The University of Western AustraliaPerth 6907Australia 不详

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.

关键词： HI regions and 21-cm lines radio telescopes and instrumentation statistical and correlative studies of properties

Mapping HⅠ in the NGC 4636 Galaxy Group with FAST

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Research in Astronomy and Astrophysics 2022年第9期22卷 202-222页

作者： Pei Zuo Dong Yang Jing Wang lister staveley-smith Xuchen Lin Bi-Qing For Tobias Westmeier Jie Wang Kristine Spekkens Virginia Kilborn O.Ivy Wong Di Li Karen Lee-Waddell Barbara Catinella Luis C.Ho Barbel Koribalski Bumhyun Lee Ming Zhu Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China International Centre for Radio Astronomy Research(ICRAR) University of Western AustraliaCrawleyWA 6009Australia Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions(ASTRO 3D) Australia National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Department of Physics and Space Science Royal Military College of CanadaP.O.Box 17000Station ForcesKingstonOntarioK7K 7B4Canada Centre for Astrophysics and Supercomputing Swinburne University of TechnologyJohn StreetHawthorn3122Australia CSIRO Space and Astronomy Australia Telescope National FacilityP.O.Box 1130BentleyWA6102Australia Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China CSIRO Space and Astronomy Australia Telecope National FacilityP.O.Box 76NSW 1710Australia School of Science Western Sydney UniversityLocked Bag 1797PenrithNSW 2751Australia Korea Astronomy and Space Science Institute Daejeon 34055Republic of Korea

This paper presents data from a 21 cm H I emission drift scan observation of a field partially covering the NGC 4636 galaxy group with the Five-hundred meter Aperture Radio Telescope(FAST). We construct a pipeline to reduce the data, and use So Fi A for source finding. When not contaminated by Radio Frequency Interference(RFI), the FAST observations are capable of detecting all of the galaxies previously detected by the Arecibo Legacy Fast ALFA(ALFALFA) survey in the same region. Comparing to ALFALFA for the detections in common, the FAST data show consistent integrated spectra when the H I disks are spatially unresolved, and capture more flux when the H I disks are resolved. The FAST data further reveal 10 new detections in the region mutually covered with ALFALFA, and 18 new detections beyond the footprint of ALFALFA. All of the new detections have the matching optical counterparts. For the member galaxies of the NGC 4636 group, the detection limit of FAST is deeper by 0.4 dex in H I mass than that of the ALFALFA data. After correcting for the incompleteness caused by RFI contamination, we show that the H I detection rate of galaxies rises steeply with radius out to the virial radius of the group, and flattens beyond that. We also examine four spatially resolved galaxy systems with potential tidal interaction features in detail. Considering that the data have been taken during the“shared-risk” period before a major source of local RFI was eliminated, the results highlight the power of FAST in detecting extragalactic H I.

关键词： Galaxy:evolution atomic data galaxies:groups:general