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arXiv 0802.4424astro-ph
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蟹状星云脉冲星散射和色散事件的相关性

Correlation of the scattering and dispersion events in the Crab Nebula pulsar

A. Kuzmin, B. Ya. Losovsky, C. A. Jordan, F. Graham Smith

摘要:

在对蟹状星云脉冲星的单独系列观测中,在111 MHz处测量了由于散射引起的脉冲展宽,在更高的射频处测量了由于脉冲延迟引起的色散变化。在一个持续200天的显著事件中,两个参数都出现了大幅增加,并且具有相似的时间特征。MJD 53950 - 54150在200天内观测到的散射和分散测量的增加可归因于电离云或细丝穿过视线的影响。该云团的直径为10^11 ~ 10^12米,电子密度为10^3 ~ 10^4 cm^-3。增加的散射可能起源于云本身,或者移动的灯丝可能在视线中的一个单独的高密度云中引起湍流。

英文摘要:

In separate series of observations of the Crab pulsar, pulse broadening due to scattering was measured at 111 MHz, and variations of dispersion due to pulse delay were measured at higher radio frequencies. In a remarkable event lasting 200 days a large increase occurred in both parameters and with similar time signatures. The increases in scattering and dispersion measure observed over the 200 days MJD 53950 - 54150 are attributable to the effects of an ionised cloud or filament crossing the line of sight. The cloud would be $10^11 - 10^12 m across, with electron density 10^3 - 10^4 cm^-3. The increased scattering might originate within the cloud itself, or the moving filament might induce turbulence in a separate higher density cloud in the line of sight.

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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