Forecasts of cosmological constraints from HI intensity mapping with FAST,BINGO and SKA-I  

作　　者：Elimboto Yohana Yi-Chao Li Yin-Zhe Ma 

机构地区：[1]Astrophysics and Cosmology Research Unit,School of Mathematics,Statistics&Computer Science,University of KwaZulu-Natal,Westville Campus,Private Bag X54001,Durban,4000,South Africa [2]Dar Es Salaam University College of Education,A Constituent College of the University of Dar Es Salaam,P.O.Box 2329 Dar Es Salaam,Tanzania [3]Astrophysics and Cosmology Research Unit,School of Chemistry and Physics,University of KwaZulu-Natal,Westville Campus,Private Bag X54001,Durban,4000,South Africa [4]NAOC-UKZN Computational Astrophysics Centre(NUCAC),University of KwaZulu-Natal,Durban,4000,South Africa

出　　处：《Research in Astronomy and Astrophysics》2019年第12期343-360,共18页天文和天体物理学研究（英文版）

基　　金：the DAAD (German Academic Exchange Service) scholarship;financial support from The African Institute for Mathematical Sciences, University of KwaZulu-Natal;The Dar Es Salaam University College of Education, Tanzania;support from the National Research Foundation of South Africa (Grant Nos. 105925 and 110984)

摘　　要：We forecast the cosmological constraints of the neutral hydrogen(HI) intensity mapping(IM)technique with radio telescopes by assuming 1-year of observational time. The current and future radio telescopes that we consider here are Five-hundred-meter Aperture Spherical radio Telescope(FAST), Baryon acoustic oscillations In Neutral Gas Observations(BINGO), and Square Kilometre Array phase Ⅰ(SKA-Ⅰ) single-dish experiments. We also forecast the combined constraints of the three radio telescopes with Planck. We find that the 1σ errors of(w0, wa) for BINGO, FAST and SKA-Ⅰ with respect to the fiducial values are respectively,(0.9293, 3.5792),(0.4083, 1.5878) and(0.3158, 0.4622). This is equivalent to(56.04%, 55.64%) and(66.02%, 87.09%) improvements in constraining(w0, wa) for FAST and SKA-Ⅰ respectively relative to BINGO. Simulations further show that SKA-Ⅰ will put more stringent constraints than both FAST and BINGO when each of the experiments is combined with Planck measurements. The 1σ errors for(w0, wa), BINGO + Planck, FAST + Planck and SKA-Ⅰ + Planck covariance matrices are respectively(0.0832, 0.3520),(0.0791, 0.3313) and(0.0678, 0.2679) implying there is an improvement in(w0, wa) constraints of(4.93%, 5.88%) for FAST + Planck relative to BINGO + Planck and an improvement of(18.51%, 23.89%) in constraining(w0, wa) for SKA-Ⅰ + Planck relative to BINGO + Planck. We also compared the performance of Planck data plus each single-dish experiment relative to Planck alone,and find that the reduction in(w0, wa) 1σ errors for each experiment plus Planck, respectively, imply the(w0, wa) constraints improvement of(22.96%, 8.45%),(26.76%, 13.84%) and(37.22%, 30.33%) for BINGO + Planck, FAST + Planck and SKA-Ⅰ + Planck relative to Planck alone. For the nine cosmological parameters in consideration, we find that there is a trade-off between SKA-Ⅰ and FAST in constraining cosmological parameters, with each experiment being more superior in constraining a particular set of parameters.We forecast the cosmological constraints of the neutral hydrogen（HI） intensity mapping（IM）technique with radio telescopes by assuming 1-year of observational time. The current and future radio telescopes that we consider here are Five-hundred-meter Aperture Spherical radio Telescope（FAST）, Baryon acoustic oscillations In Neutral Gas Observations（BINGO）, and Square Kilometre Array phase Ⅰ（SKA-Ⅰ） single-dish experiments. We also forecast the combined constraints of the three radio telescopes with Planck. We find that the 1σ errors of（w0, wa） for BINGO, FAST and SKA-Ⅰ with respect to the fiducial values are respectively,（0.9293, 3.5792）,（0.4083, 1.5878） and（0.3158, 0.4622）. This is equivalent to（56.04%, 55.64%） and（66.02%, 87.09%） improvements in constraining（w0, wa） for FAST and SKA-Ⅰ respectively relative to BINGO. Simulations further show that SKA-Ⅰ will put more stringent constraints than both FAST and BINGO when each of the experiments is combined with Planck measurements. The 1σ errors for（w0, wa）, BINGO + Planck, FAST + Planck and SKA-Ⅰ + Planck covariance matrices are respectively（0.0832, 0.3520）,（0.0791, 0.3313） and（0.0678, 0.2679） implying there is an improvement in（w0, wa） constraints of（4.93%, 5.88%） for FAST + Planck relative to BINGO + Planck and an improvement of（18.51%, 23.89%） in constraining（w0, wa） for SKA-Ⅰ + Planck relative to BINGO + Planck. We also compared the performance of Planck data plus each single-dish experiment relative to Planck alone,and find that the reduction in（w0, wa） 1σ errors for each experiment plus Planck, respectively, imply the（w0, wa） constraints improvement of（22.96%, 8.45%）,（26.76%, 13.84%） and（37.22%, 30.33%） for BINGO + Planck, FAST + Planck and SKA-Ⅰ + Planck relative to Planck alone. For the nine cosmological parameters in consideration, we find that there is a trade-off between SKA-Ⅰ and FAST in constraining cosmological parameters, with each exp

关 键 词：surveys galaxies:statistics cosmology:observations large-scale structure of Universe galaxies:kinematics and dynamics 

分 类 号：P159[天文地球—天文学] P111