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arXiv 2208.04889astro-ph.HE
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射电宽带阿雷西博源的脉冲星发射波束几何

Pulsar Emission Beam Geometry of Radio Broadband Arecibo Sources

Timothy Olszanski, Joanna Rankin, Arun Venkataraman, Haley Wahl

摘要:

我们提出了无线电脉冲星发射波束的分析和模型的主要目的是检查脉冲星波束的几何形状和物理在最宽的射频合理可获得的。我们考虑了一组位于阿雷西博天空中的经过充分研究的恒星。这些辐射源因其可检测到的宽频率范围而脱颖而出,并在高达4.5 GHz和低于100 MHz的频率下被广泛观察到。我们利用已发表的配置文件,以量化的核心/双锥发射光束模型作为我们的分类框架,这些historiars的频率演变的一个更完整的图片。对于低频观测,我们考虑到测量的散射时间尺度来推断脉冲轮廓的固有与散射展宽。最后,我们讨论了人口趋势的核心/conal类配置文件的内在参数。我们表明,对于这个子人口的pumerars,核心和conal为主的配置文件群集在一起成两个大致隔离的$P$ - $\dot{P}$人口,借贷的建议,在成对形成的几何形状的演变是负责核心/conal发射和其他发射效应,如归零和模式改变的证据。

英文摘要:

We present radio pulsar emission beam analyses and models with the primary intent of examining pulsar beam geometry and physics over the broadest band of radio frequencies reasonably obtainable. We consider a set of well-studied pulsars that lie within the Arecibo sky. These pulsars stand out for the broad frequency range over which emission is detectable, and have been extensively observed at frequencies up to 4.5 GHz and down to below 100 MHz. We utilize published profiles to quantify a more complete picture of the frequency evolution of these pulsars using the core/double-cone emission beam model as our classification framework. For the low-frequency observations, we take into account measured scattering time-scales to infer intrinsic vs scatter broadening of the pulse profile. Lastly, we discuss the populational trends of the core/conal class profiles with respect to intrinsic parameters. We demonstrate that for this sub-population of pulsars, core and conal dominated profiles cluster together into two roughly segregated $P$-$\dot{P}$ populations, lending credence to the proposal that an evolution in the pair-formation geometries is responsible for core/conal emission and other emission effects such as nulling and mode-changing.

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