费米LAT数据的探索——对J1930+1852脉冲星的分析

McGill Science undergraduate research journal : MSURJ Pub Date : 2018-04-09 DOI:10.26443/msurj.v13i1.25

A. Cook

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引用次数: 0

摘要

背景：费米LAT的9年天体物理伽马射线数据集（最近重新处理）揭示了许多新的天体物理来源。对这些以前从未见过的来源之一PSR J1930+1852和相关的脉冲星风星云G54.0+0.3进行更深入的分析，可能有助于证实脉冲星的伽马射线发射机制。方法：利用费米LAT数据和最大似然拟合的科学工具对PSR J1930+1852和PWN G54.0+0.3进行了详细的研究和分析。结果：在脉冲星/脉冲星风星云的坐标系上，观测到高于本底的4.3σ（p=0.0000117）过量，其源光谱符合单次幂律。限制：模型中的源被建模为点源。进一步的研究可能需要考虑在建模区域中扩展来源的可能性。结论：有证据表明费米LAT探测到了这个脉冲星风星云，其源光谱似乎符合标准的幂律。上限计算预测，在9年的数据集中，只有大约100个能量超过1GeV的事件，因此没有进行脉动搜索。

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Exploration of Fermi-LAT Data: An Analysis of Pulsar J1930+1852

Background: Fermi-LAT’s 9-year data set of astrophysical gamma-rays (recently reprocessed) has revealed many new astrophysical sources. A closer analysis of one of these previously unseen sources, PSR J1930+1852 and associated pulsar wind nebula, G54.0+0.3, could help to confirm the gamma-ray emission mechanism of pulsars. Methods: An investigation and analysis of PSR J1930+1852 and PWN G54.0+0.3 using Fermi-LAT data and science tools using maximum likelihood fitting is detailed.Results: A 4.3 σ (p = 0.000017) excess above background was observed at the coordinates of the pulsar/pulsar wind nebula and the sources spectrum appears to be consistent with a single power law. Limitations: The sources in the models are modelled as point sources. Further studies may want to consider the possibility of extended sources in the modelled region. Conclusion: There is evidence for a Fermi-LAT detection of this pulsar wind nebula and the source spectrum appears to be consistent with a standard power law. An upper limit calculation predicts only about 100 events with energy above 1 GeV in the 9-year data set so a pulsation search was not conducted.

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McGill Science undergraduate research journal : MSURJ

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