Timing and Single-pulse Study of Pulsar J1909+0122 Discovered by CRAFTS  

作　　者：Yutong Chen Pei Wang Di Li Erbil Gügercinoğlu Rushuang Zhao Lingqi Meng Jianping Yuan Jiarui Niu Weiwei Zhu Yi Feng Chenchen Miao Chenhui Niu Qingdong Wu Na Wang Shen Wang Xiaoyao Xie Mengyao Xue Jumei Yao Mao Yuan Shanping You Xuhong Yu Youling Yue Jie Zhang Junshuo Zhang Lei Zhang Yabiao Wang Zhenye Gan Yuxi Li Zhongyi Sun Chengjie Wang 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute for Frontiers in Astronomy and Astrophysics,Beijing Normal University,Beijing 102206,China [4]Research Center for Intelligent Computing Platforms,Zhejiang Laboratory,Hangzhou 311100,China [5]Guizhou Normal University,Guiyang 550001,China [6]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [7]College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China [8]Fudan University,Shanghai 200443,China [9]Qilu Normal University,Jinan 250200,China [10]Tencent Youtu Lab,Shanghai 200233,China

出　　处：《Research in Astronomy and Astrophysics》2023年第8期319-331,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)Grant Nos.11988101,1172531312041303,12041304,12203045,12203070,12103013,T2241020;the National SKA Program of China(Nos.2020SKA0120200,2022SKA0130100,2022SKA0130104);the Foundation of Science and Technology of Guizhou Province(No.(2021)023);the Foundation of Guizhou Provincial Education Department(Nos.KY(2021)303,KY(2020)003);support from the National Natural Science Foundation of China under grant U2031117;the Youth Innovation Promotion Association CAS(id.2021055);CAS Project for Young Scientists in Basic Research(grant YSBR006);the Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS。

摘　　要：We report the discovery of PSR J1909+0122 by the Five-hundred-meter Aperture Spherical Radio Telescope(FAST)as part of the Commensal Radio Astronomy FAST Survey.PSR J1909+0122 has a spin period of 1.257 s and a dispersion measure of 186.2 pc cm^(-3).The averaged pulse profile shows two distinct components.We performed a single-pulse study based on a one-hour observation at 1.25 GHz on 2021 August 23.We used a threshold of 5σ_(ep) to measure the nulling fraction(NF)as 63%±1.5%.The longitude-resolved fluctuation spectra and fast Fourier transform spectra of the binary sequences revealed the quasi-periodicity of nulling with a period of 30 rotation periods.We examined the reliability of the periodicity by comparing it to random noise injection.The NF,E,and modulation periodicity P_(M) of PSR J1909+0122 were compared with other periodic nulling pulsars,showing that the source of J1909+0122 has the second largest NF in the population.Long-term timing observations over six months were used to derive the phase-connected ephemeris of this pulsar.The measured P and P values disfavor dipolar geometry for polar gap models,and the prediction for a space-charge-limited flow model in the case of inverse Compton scattering is only just above the death line.In this work,PSR J1909+0122 has revealed possible correlations between nulling behavior and pulsar properties,which will help to shed light on the pulsar emission mechanism and its temporal evolution in future observations.

关 键 词：(stars:)pulsars general-(stars:)pulsars individual(PSR J1909+0122)-stars NEUTRON 

分 类 号：P145.6[天文地球—天体物理]