arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0912.3944astro-ph.HEastro-ph.GA
收藏

通过蟹状星云巨脉冲射电/ Gamma-Ray相关约束脉冲星发射物理

Constraining Pulsar Emission Physics through Radio/Gamma-Ray Correlation of Crab Giant Pulses

A. V. Bilous, V. I. Kondratiev, M. A. McLaughlin, M. Mickaliger, D. R. Lorimer, S. M. Ransom, M. Lyutikov, B. Stappers, G. I. Langston

摘要:

为了约束巨脉冲(GP)发射机制并检验Lyutikov(2007)的GP发射模型,我们正在对蟹状星云脉冲星进行伽马射线(费米)和无线电波长之间的同时观测。无线电GP和高能光子的到达时间之间的相关性,无论它是否存在,都将使我们能够在GP发射的不同来源之间进行选择,并进一步限制发射物理。我们的首要目标是测试无线电全球定位系统是否是由于无线电发射机制的相干性变化,脉冲星磁层中对创建速率的变化,或波束方向的变化。实现这一目标需要大量的同时无线电GPS和伽马光子。因此,我们组织了一次无线电观测活动,使用了英国Jodrell Bank天文台的42英尺望远镜、140英尺望远镜和100米的Robert C.绿岸天文台(Green Bank Observatory)的伯德绿岸望远镜(GBT)。虽然前两个的观测正在进行中,但在这里,我们提出了在8.9 GHz的高频下使用GBT进行20小时观测的初步结果。这些特殊的观测旨在探测Lyutikov(2007)的GP发射模型,该模型预测频率> 4 GHz的GP应该伴随着能量为1-100 GeV的伽马射线光子。

英文摘要:

To constrain the giant pulse (GP) emission mechanism and test the model of Lyutikov (2007) of GP emission, we are carrying out a campaign of simultaneous observations of the Crab pulsar between gamma-rays (Fermi) and radio wavelengths. The correlation between times of arrival of radio GPs and high-energy photons, whether it exists or not, will allow us to choose between different origins of GP emission and further constrain the emission physics. Our foremost goal was testing whether radio GPs are due to changes in the coherence of the radio emission mechanism, variations in the pair creation rate in the pulsar magnetosphere, or changes in the beaming direction. Accomplishing this goal requires an enormous number of simultaneous radio GPs and gamma-photons. Thus, we organized a radio observations campaign using the 42-ft telescope at the Jodrell Bank Observatory (UK), the 140-ft telescope, and the 100-m Robert C. Byrd Green Bank Telescope (GBT) at the Green Bank Observatory (WV). While the observations with the two first ones are ongoing, here we present the preliminary results of 20 hrs of observations with the GBT at the high frequency of 8.9 GHz. These particular observations were aimed to probe the model of GP emission by Lyutikov (2007) which predicts that GPs at frequencies > 4 GHz should be accompanied by gamma-ray photons of energies of 1-100 GeV.

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。

↑