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arXiv 0804.3838astro-ph
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多频积分剖面图

Multi-frequency integrated profiles of pulsars

Simon Johnston, Aris Karastergiou, Dipanjan Mitra, Yashwant Gupta

摘要:

我们在243 - 3100兆赫的五个频率上共观测到67个类星体。在印度的巨型米波望远镜和在澳大利亚的帕克斯望远镜进行了较低频率的观测。我们目前的配置文件从34个样品的最佳信噪比和最少的散射。脉冲星剖面的一般“规则”在数据中可见;随着频率的增加,剖面变得更窄,极化分数下降,外部分量变得更加突出。这些规则的许多反例也被观察到,具有复杂配置文件的用户特别容易违反规则。我们假设脉冲星辐射在磁层内的位置随着脉冲星自旋的下降而随时间演化。在高能量的类星体中,辐射来自一个有限的高海拔范围,在中等自旋能量的范围内,辐射发生在很宽的海拔范围内,而在低自旋能量的类星体中,它被限制在磁层的低层。

英文摘要:

We have observed a total of 67 pulsars at five frequencies ranging from 243 to 3100 MHz. Observations at the lower frequencies were made at the Giant Metre Wave Telescope in India and those at higher frequencies at the Parkes Telescope in Australia. We present profiles from 34 of the sample with the best signal to noise ratio and the least scattering. The general `rules' of pulsar profiles are seen in the data; profiles get narrower, the polarization fraction declines and outer components become more prominent as the frequency increases. Many counterexamples to these rules are also observed, and pulsars with complex profiles are especially prone to rule breaking. We hypothesise that the location of pulsar emission within the magnetosphere evolves with time as the the pulsar spins down. In highly energetic pulsars, the emission comes from a confined range of high altitudes, in the middle range of spin down energies the emission occurs over a wide range of altitudes whereas in pulsars with low spin-down energies it is confined to low down in the magnetosphere.

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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