2021•Research in Astronomy and AstrophysicsRequires access
An Arecibo follow-up study of seven pulsars discovered by Five-hundred-meter Aperture Spherical radio Telescope (FAST)
Shen Wang, Weiwei Zhu, Di Li, Zhichen Pan, Pei Wang, J. M. Cordes, Shami Chatterjee, Jumei Yao, Lei Qian, Youling Yue, Lei Zhang, Ru-Shuang Zhao, Shuangqiang Wang, Jiarui Niu, Mao Yuan, Chenchen Miao, Xiaoyao Xie, Zhi-Jie Liu, Xuhong Yu, Shan-Ping You, Lingqi Meng
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Abstract
Abstract We present Arecibo 327 MHz confirmation and follow-up studies of seven new pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These pulsars are discovered in a pilot program of the Commensal Radio Astronomy FAST Survey (CRAFTS) with the ultra-wide-bandwidth commissioning receiver. Five of them are normal pulsars and two are extreme nulling slow pulsars. PSR J2111+2132’s dispersion measure(DM: 78.5 pc cm −3 ) is above the upper limits of the two Galactic free electron density models, NE2001 and YMW16, and PSR J2057+2133’s position is out of the Scutum-Crux Arm, making them uniquely useful for improving the Galactic free electron density model in their directions. We present a detailed single pulse analysis for the slow nulling pulsars. We show evidence that PSR J2323+1214’s main pulse component follows a non-Poisson distribution and marginal evidence for a sub-pulse-drift or recurrent period of 32.3±0.4 rotations from PSR J0539+0013. We discuss the implication of our finding to the pulsar radiation mechanism.