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High energy gamma-ray observations of the Crab Nebula and pulsar with the Solar Tower Atmospheric Cherenkov Effect Experiment.

机译:利用太阳塔大气契伦科夫效应实验对蟹状星云和脉冲星进行高能伽玛射线观测。

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摘要

The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) is a new ground-based atmospheric Cherenkov telescope for gamma-ray astronomy. STACEE uses the large mirror area of a solar heliostat facility to achieve a low energy threshold. A prototype experiment which uses 32 heliostat mirrors with a total mirror area of ∼1200 m2 has been constructed. This prototype, called STACEE-32, was used to search for high energy gamma-ray emission from the Crab Nebula and Pulsar. Observations taken between November 1998 and February 1999 yield a strong statistical excess of gamma-like events from the Crab, with a significance of +6.75σ in 43 hours of on-source observing time. No evidence for pulsed emission from the Crab Pulsar was found, and the upper limit on the pulsed fraction of the observed excess was 5.5% at the 90% confidence level. A subset of the data was used to determine the integral flux of gamma rays from the Crab. We report an energy threshold of Eth = 190 ± 60 GeV, and a measured integral flux of I(E > Eth) = (2.2 ± 0.6 ± 0.2) × 10−10 photons cm−2 s−1. The observed flux is in agreement with a continuation to lower energies of the power law spectrum seen at TeV energies.
机译:太阳塔大气契伦科夫效应实验(STACEE)是一种用于伽马射线天文学的新型地基大气契伦科夫望远镜。 STACEE使用太阳能定日镜设备的大镜面面积来实现较低的能量阈值。已建立了一个使用32个定日镜的实验原型,总镜面积约为1200 m 2 。该原型机称为STACEE-32,用于搜索蟹状星云和脉冲星发出的高能伽马射线。在1998年11月至1999年2月之间进行的观测显示,螃蟹产生的类似伽玛事件的统计量非常高,在源头观测时间的43小时内具有+6.75σ的显着性。找不到蟹蟹脉冲星发出脉冲发射的证据,在90%的置信度下,所观察到的过量脉冲峰值的上限小于<5.5%。数据的子集用于确定来自螃蟹的伽马射线的积分通量。我们报告能量阈值为 E th = 190±60 GeV,并且测得的积分通量为 I E E th )=(2.2±0.6±0.2)×10 −10 光子cm −2 s -1 。观测到的通量与在TeV能量处看到的幂律谱的较低能量的延续一致。

著录项

  • 作者

    Oser, Scott Michael.;

  • 作者单位

    The University of Chicago.;

  • 授予单位 The University of Chicago.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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