Study on 21 cm Signal of High Redshift Quasars |
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| Affiliation: | 1. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550025 China;2. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang 550001, China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023 China;2. Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023 China;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Information Engineering, Dezhou Mechanical and Electrical Engineering School, Dezhou 251200, China;2. Department of Information Engineering, Technological Vocational College of Dezhou, Dezhou 251200, China |
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| Abstract: | We use the results of high resolution numerical simulations to fix the theoretical model of high redshift quasars (QSOs) ionizing and heating neutral gas, and predict the signal characteristics and signal/noise (S/N) ratios for Five-hundred-meter Aperture Spherical Telescope (FAST) to observe the 21 cm radiation around QSO. Our conclusions are summarized as: (1) the 21 cm frequency spectrum under the FAST field has full HII region for the QSO at and with luminosity similar to ULAS J1120+0641, while has only a small trough for the QSO at and with low luminosity; (2) the effect of Finite Light Travel Time (FLTT) obviously changes the 21 cm frequency spectrum of high redshift QSOs, makes the transition curve at lower frequency much steeper than that at higher frequency; (3) the FAST telescope can observe the 21 cm radiation of high redshift QSO with very high S/N ratio as high as , thus can identify the HII regions and the FLTT effect. |
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