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arXiv 1208.5686astro-ph.HE
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切伦科夫望远镜阵列(Cherenkov Telescope Array)

Surveys with the Cherenkov Telescope Array

G. Dubus, J. L. Contreras, S. Funk, Y. Gallant, T. Hassan, J. Hinton, Y. Inoue, J. Knödlseder, P. Martin, N. Mirabal, M. de Naurois, M. Renaud

摘要:

调查开辟了公正的发现空间,并生成具有长期价值的遗留数据集。像CTA这样的切伦科夫望远镜成像阵列的目标之一是调查天空中微弱的甚高能量伽马射线(VHE)源,特别是那些如果没有VHE辐射就不会引起注意的源(例如银河系的“黑暗加速器”)。目前已知的VHE源中有一半以上将在银河平面上找到。使用标准技术,CTA可以在250小时内(一个地点每年可用时间的1/4)对|l| <60度、|b| <2度的区域进行调查,灵敏度统一为3 mCrab(“银河平面调查”)。CTA还可以在370小时的观测时间内测量1/4的天空,灵敏度为20 mCrab(“全天测量”),这很好地补充了费米/LAT在较低能量下的测量和扩展的空气簇射阵列在较高能量下的测量。在(非标准)发散指向模式下的观测可以将“全天巡天”时间缩短到100小时左右,而不损失巡天灵敏度。我们提出了这些调查的科学原理,他们在多波长的背景下,他们可能的影响和他们的可行性。我们发现,银河平面调查有可能检测数百个来源。实施这样的调查应该是CTA的一个主要目标。此外,预计全天巡天将探测到大约12个耀变体,或费米/LAT源的对应物,其主要动机是寻找河外“暗加速器”。

英文摘要:

Surveys open up unbiased discovery space and generate legacy datasets of long-lasting value. One of the goals of imaging arrays of Cherenkov telescopes like CTA is to survey areas of the sky for faint very high energy gamma-ray (VHE) sources, especially sources that would not have drawn attention were it not for their VHE emission (e.g. the Galactic "dark accelerators"). More than half the currently known VHE sources are to be found in the Galactic plane. Using standard techniques, CTA can carry out a survey of the region |l|<60 degrees, |b|<2 degrees in 250 hr (1/4th the available time per year at one location) down to a uniform sensitivity of 3 mCrab (a "Galactic Plane survey"). CTA could also survey 1/4th of the sky down to a sensitivity of 20 mCrab in 370 hr of observing time (an "all-sky survey"), which complements well the surveys by the Fermi/LAT at lower energies and extended air shower arrays at higher energies. Observations in (non-standard) divergent pointing mode may shorten the "all-sky survey" time to about 100 hr with no loss in survey sensitivity. We present the scientific rationale for these surveys, their place in the multi-wavelength context, their possible impact and their feasibility. We find that the Galactic Plane survey has the potential to detect hundreds of sources. Implementing such a survey should be a major goal of CTA. Additionally, about a dozen blazars, or counterparts to Fermi/LAT sources, are expected to be detected by the all-sky survey, whose prime motivation is the search for extragalactic "dark accelerators".

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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