The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has discovered more than 650 new pulsars,which account for 20%of our known Galactic pulsar population.In this paper,we estimate the prospect of a pulsar s...The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has discovered more than 650 new pulsars,which account for 20%of our known Galactic pulsar population.In this paper,we estimate the prospect of a pulsar survey with a radio telescope array to be planned—the FAST Array(FASTA),consists of six“FAST-type”telescopes.Such a sensitive radio telescope array would be a powerful instrument in probing the pulsar population deep into our Galaxy as well as in nearby galaxies.We simulate the FASTA pulsar discovery prospects with different Galactic pulsar population models and instrumental parameter combinations.We find that FASTA could detect tens of thousands of canonical pulsars and well-over thousands of millisecond pulsars.We also estimate the potential yield if the FASTA is used to search for pulsars from the nearby spiral galaxy M31,and find that it would probably discover around a hundred new radio pulsars.展开更多
This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consist...This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consisting of three parallel cylindrical reflectors and equipped with 96 dual-polarization feeds,is a radio interferometer array designed for conducting drift scans of the northern celestial semi-sphere.The FRB digital backend enables the formation of 96 digital beams,effectively covering an area of approximately 40 square degrees with the 3 dB beam.Our pipeline demonstrates the capability to conduct an automatic search of FRBs,detecting at quasi-realtime and classifying FRB candidates automatically.The current FRB searching pipeline has an overall recall rate of88%.During the commissioning phase,we successfully detected signals emitted by four well-known pulsars:PSR B0329+54,B2021+51,B0823+26,and B2020+28.We report the first discovery of an FRB by our array,designated as FRB 20220414A.We also investigate the optimal arrangement for the digitally formed beams to achieve maximum detection rate by numerical simulation.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)grant No.12203070the National SKA Program of China No.2020SKA0120200+7 种基金supported by the NSFC grant Nos.12041303 and 11873067the CAS-MPG LEGACY projectsupported by the Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CASProject funded by China Postdoctoral Science Foundation No.2021M703237supported by NSFC 12133004the National SKA Program of China No.2020SKA0120101the Science and Technology Program of Guangzhou(No.202102010466)the Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,China.
文摘The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has discovered more than 650 new pulsars,which account for 20%of our known Galactic pulsar population.In this paper,we estimate the prospect of a pulsar survey with a radio telescope array to be planned—the FAST Array(FASTA),consists of six“FAST-type”telescopes.Such a sensitive radio telescope array would be a powerful instrument in probing the pulsar population deep into our Galaxy as well as in nearby galaxies.We simulate the FASTA pulsar discovery prospects with different Galactic pulsar population models and instrumental parameter combinations.We find that FASTA could detect tens of thousands of canonical pulsars and well-over thousands of millisecond pulsars.We also estimate the potential yield if the FASTA is used to search for pulsars from the nearby spiral galaxy M31,and find that it would probably discover around a hundred new radio pulsars.
基金support of the National SKA program of China(Nos.2022SKA0110100 and 2022SKA0110101)the National Natural Science Foundation of China(NSFC,Grant Nos.1236114814,12203061,12273070,and 12303004)。
文摘This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consisting of three parallel cylindrical reflectors and equipped with 96 dual-polarization feeds,is a radio interferometer array designed for conducting drift scans of the northern celestial semi-sphere.The FRB digital backend enables the formation of 96 digital beams,effectively covering an area of approximately 40 square degrees with the 3 dB beam.Our pipeline demonstrates the capability to conduct an automatic search of FRBs,detecting at quasi-realtime and classifying FRB candidates automatically.The current FRB searching pipeline has an overall recall rate of88%.During the commissioning phase,we successfully detected signals emitted by four well-known pulsars:PSR B0329+54,B2021+51,B0823+26,and B2020+28.We report the first discovery of an FRB by our array,designated as FRB 20220414A.We also investigate the optimal arrangement for the digitally formed beams to achieve maximum detection rate by numerical simulation.
