arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.09207astro-ph.HE
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在整个脉冲相位上检测PSR B0950 +08的无线电信号

The radio signal of PSR B0950+08 is detected over the whole pulse phase

Zhengli Wang, Jiguang Lu, Jinchen Jiang, Jie Lin, Kejia Lee, Enwei Liang, Renxin Xu

摘要:

脉冲星是宇宙中的“灯塔”。当旋转脉冲星的射电束扫过望远镜时,探测到占空比约为10%的周期脉冲。本文分析了500米口径球面射电望远镜(FAST)对一颗邻近脉冲星PSR B0950+08的160分钟观测数据。由于FAST的极高灵敏度,我们发现PSR B0950+08的辐射可以在整个脉冲周期内被检测到。为了研究脉冲星“桥发射”的辐射特性,定义了一个函数$Θ$(n)来描述桥发射的弱辐射。结果表明,主脉冲和间脉冲的窄峰都可以在低空辐射,而其他弱辐射(如,虽然其辐射机制仍是一个有争议的问题。在该脉冲星的强发射阶段,测量的平均脉冲行为与前人的结果一致,脉冲间和主脉冲之间的频率无关分离以及窄脉冲宽度可能支持双极模型。为了了解这颗脉冲星的磁层几何结构,需要进一步利用FAST进行偏振校准观测,并适当确定基线发射,特别是在弱发射阶段。

英文摘要:

Pulsars are the "lighthouses" in the universe. Periodic pulses with the duty-cycle ~10% are detected when the radio beam of the rotating pulsar sweeps across the telescope. In this report, the 160 min-data of a nearby pulsar, PSR B0950+08, observed with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) is analysed. Thanks to the extremely high sensitivity of FAST, it is found that the radiation of PSR B0950+08 could be detected over the entire pulse period. To investigate the radiative characteristics of the pulsar' "bridge emission", a function, $Θ$(n), is defined to reveal the weak radiation there. It is suggested that the narrow peaks of both the main and the inter pulses could be radiated at low altitude, while other weak emission (e.g., the "bridges") from upper magnetosphere though its radiative mechanism is still a matter of debate. The measured mean pulse behaviors are consistent with previous results in the phase of strong emission of this pulsar, and both the frequency-independent separation between the inter-pulse and main pulse and the narrow pulse width may support a double-pole model. In order to understand the magnetospheric geometry of this pulsar, further polarization calibrated observation with FAST and a proper determination of the baseline emission, especially during the weak emission phase, are surely required.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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