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arXiv 1002.4027astro-ph.HEastro-ph.GA
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费米大天区望远镜对脉冲星的观测

Pulsar Observations with the Fermi Large Area Telescope

Damien Parent

摘要:

费米望远镜(英语:Fermi Telescope),是一个于2008年6月11日发射升空的太空望远镜,用于探测高能伽马射线宇宙。该仪器的能量范围从20 MeV到300 GeV,灵敏度大大提高,能够定位伽马射线点源。它通过转换成电子-正电子对并在跟踪器中测量它们的方向和在量热计中测量它们的能量来探测伽马射线。本文介绍了LAT探测到的射电暴γ射线源的γ射线光变曲线和相位分辨光谱测量。脉冲星光谱参数(积分通量、光谱指数和能量截止)的测量依赖于仪器响应函数(IRF)。利用Vela脉冲星提出了一种在轨验证有效面积的方法。在背景剔除的每个阶段,比较了真实数据和模拟数据之间的切割效率。然后将结果传播到IRF,从而估计光谱参数的系统不确定性。本文的最后一部分介绍了利用LAT观测和射电、X星历表发现的新的单个γ射线双星,如PSR J 0205 +6449,以及类船帆座双星J2229+6114和J1048-5832。时间和频谱分析的影响,以约束的伽马射线发射模型。此外,我们讨论了大量的伽玛射线天体的LAT检测,包括正常的天体,毫秒天体的属性。

英文摘要:

The Large Area Telescope (LAT) on Fermi, launched on 2008 June 11, is a space telescope to explore the high energy gamma-ray universe. The instrument covers the energy range from 20 MeV to 300 GeV with greatly improved sensitivity and ability to localize gamma-ray point sources. It detects gamma-rays through conversion to electron-positron pairs and measurement of their direction in a tracker and their energy in a calorimeter. This thesis presents the gamma-ray light curves and the phase-resolved spectral measurements of radio-loud gamma-ray pulsars detected by the LAT. The measurement of pulsar spectral parameters (i.e. integrated flux, spectral index, and energy cut-off) depends on the instrument response functions (IRFs). A method developed for the on-orbit validation of the effective area is presented using the Vela pulsar. The cut efficiencies between the real data and the simulated data are compared at each stage of the background rejection. The results are then propagated to the IRFs, allowing the systematic uncertainties of the spectral parameters to be estimated. The last part of this thesis presents the discoveries, using both the LAT observations and the radio and X ephemeredes, of new individual gamma-ray pulsars such as PSR J0205+6449, and the Vela-like pulsars J2229+6114 and J1048-5832. Timing and spectral analysis are investigated in order to constrain the gamma-ray emission model. In addition, we discuss the properties of a large population of gamma-ray pulsars detected by the LAT, including normal pulsars, and millisecond pulsars.

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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