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arXiv 1302.6387astro-ph.IM
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Geomagnetic Field对CTA观测站可能站址的IACT探测技术的影响

Influence of the Geomagnetic Field on the IACT detection technique for possible sites of CTA observatories

M. Szanecki, K. Bernlöhr, D. Sobczyńska, A. Niedźwiecki, J. Sitarek, W. Bednarek

摘要:

我们调查了地磁场(GF)对成像空气切伦科夫望远镜技术的影响,两个北部(特内里费岛和圣佩德罗马蒂尔)和三个南部(萨尔塔,莱昂西托和纳米比亚(H.E.S.S.- Cherenkov Telescope Array(CTA)天文台的候选站点。我们使用CORSIKA和sim_telarray程序对γ射线簇射、强子背景和望远镜响应进行了蒙特卡罗模拟。在这里,我们专注于伽马射线测量在低能量,子100 GeV,范围。因此,我们只考虑几个大型望远镜阵列的性能。忽略GF效应,我们发现(与以前的研究一致),这样的阵列具有较低的能量阈值,和较大的收集面积低于30 GeV,当位于较高的海拔高度。然而,我们指出,在所考虑的高度和磁场强度范围内,1800-3600 m a.s.l.和0-40 μ T时,GF效应具有与该海拔效应相似的幅度。我们提供了受GF效应影响的天文台的性能参数,特别是收集区域,检测率和所有五个位置的能量阈值,这些信息可能有助于CTA的选址。我们还发现简单的缩放这些参数的磁场强度,它可以用来评估其他网站的GF效应的大小,在这项工作中,我们用它们来估计五个网站的性能参数:南非博福特西,美国Yavapai牧场,纳米比亚Lalapanzi,智利La Silla和印度Hanle。我们大致调查的影响,地球物理条件对伽马/强子分离程序,包括图像的形状和方向切割。

英文摘要:

We investigate the influence of the geomagnetic field (GF) on the Imaging Air Cherenkov Telescope technique for two northern (Tenerife and San Pedro Martir) and three southern (Salta, Leoncito and Namibia (the H.E.S.S.-site)) site candidates for Cherenkov Telescope Array (CTA) observatories. We use the CORSIKA and sim_telarray programs for Monte Carlo simulations of gamma ray showers, hadronic background and the telescope response. We focus here on gamma ray measurements in the low energy, sub-100 GeV, range. Therefore, we only consider the performance of arrays of several large telescopes. Neglecting the GF effect, we find (in agreement with previous studies) that such arrays have lower energy thresholds, and larger collection areas below 30 GeV, when located at higher altitudes. We point out, however, that in the considered ranges of altitudes and magnetic field intensities, 1800-3600 m a.s.l. and 0-40 uT, respectively, the GF effect has a similar magnitude to this altitude effect. We provide the trigger-level performance parameters of the observatory affected by the GF effect, in particular the collection areas, detection rates and the energy thresholds for all five locations, which information may be useful in the selection of sites for CTA. We also find simple scaling of these parameters with the magnetic field strength, which can be used to assess the magnitude of the GF effect for other sites; in this work we use them to estimate the performance parameters for five sites: South Africa-Beaufort West, USA-Yavapai Ranch, Namibia-Lalapanzi, Chile-La Silla and India-Hanle. We roughly investigate the impact of the geophysical conditions on gamma/hadron separation procedures involving image shape and direction cuts.

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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