Timing and single pulse study of pulsar J1909+0122 discovered by CRAFTS
Timing and single pulse study of pulsar J1909+0122 discovered by CRAFTS
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DOI：
10.1088/1674-4527/acd89d
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发表时间：
2023
影响因子：
1.8
通讯作者：
Jie Z
中科院分区：
文献类型：
--
作者：
Yutong Chen;Pei Wang;Di Li;Erbil Gügercinoğlu;Zhao Rushuang;Lingqi Meng;Jianping Yuan;Jiarui Niu;Weiwei Zhu;Yi Feng;Chenchen Miao;Chenhui Niu;Qingdong Wu;Na Wang;Shen Wang;Xiaoyao Xie;Xuhong Yu;Mengyao XUE;Jumei Yao;Mao Yuan;You Shanping;Youling Yue;Jie Z
Abstract. 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 (CRAFTS). PSR J1909+0122 has a spin period of 1.257 seconds, a dispersion measure (DM) of 186.2 pc cm-3. The averaged pulse profile shows two distinct components. We performed single-pulse study based on one-hour observation at 1.25 GHz on August 23rd, 2021. We used a threshold of 5 σep to measure the nulling fraction (NF) as 63% ± 1.5%. The longitude resolved fluctuation spectra (LRFS) and FFT spectra of the binary sequences revealed the 30-rotation-period quasi-periodicity of nulling. We examined the reliability of the periodicity by comparing it to random noise injection. The NF, E-dot, and modulation periodicity PM of PSR J1909+0122 were compared with other periodic nulling pulsars, showing 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-dot 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.
