论文标题

与Cherenkov望远镜的10-100 TEV频段中的大规模扩散伽马射线排放

Mapping large-scale diffuse gamma-ray emission in 10-100 TeV band with Cherenkov telescopes

论文作者

Neronov, A., Semikoz, D.

论文摘要

通过成像大气Cherenkov望远镜(IACT)从银河系中弥漫性伽马射线发射(IACT)的测量很难,因为高水平的带电宇宙射线背景和小型视野。我们表明,在10-100 TEV的能量频段中,这种测量是可能的。在用于宇宙射线电子的分析的事件选择中,实现了IACTS的最小带电粒子背景。在这些事件选择中,事件质量的紧密切割允许达到足够低的背景水平,以允许在10 TEV上方的弥漫性银河伽马射线通量进行测量。我们计算出不同类型的IACT阵列的敏感性,用于银河弥漫发射测量值,并将其与Fermi大面积望远镜在3 TEV以下和由IceCube TeleScope测得的天体中性信号测量的天空的不同部分进行比较。我们表明,现有IACT系统的深入暴露足以检测从所有银河平面到银河纬度| b |〜度的弥散通量。 CTA的中型望远镜阵列将能够检测到30度银河纬度的弥散通量。它的敏感性足以检测Icecube天体物理中微子信号高于10 TEV的银河系分量的伽马射线对应物。我们还建议,由小而广泛的视野望远镜组成的专用IACT系统可用于映射10-100 TEV,从整个天空中从整个天空中弥漫性伽马射线发射。

Measurement of diffuse gamma-ray emission from the Milky Way with Imaging Atmospheric Cherenkov Telescopes (IACT) is difficult because of high level of charged cosmic ray background and small field-of-view. We show that such a measurement is nevertheless possible in the energy band 10-100 TeV. The minimal charged particle background for IACTs is achieved in event selections used for the analyses of the cosmic ray electrons. Tight cuts on the event quality in these event selections allow to achieve the background level sufficiently low to allow the measurements of the diffuse Galactic gamma-ray flux above 10 TeV. We calculate the sensitivities of different types of IACT arrays for the Galactic diffuse emission measurements and compare them with the diffuse gamma-ray flux from different parts of the sky measured by the Fermi Large Area Telescope below 3 TeV and with the astrophysical neutrino signal measured by IceCube telescope. We show that deep exposure of existing IACT systems is sufficient for detection of the diffuse flux from all the Galactic Plane up to Galactic latitude |b|~ degrees. Medium Size Telescope array of CTA will be able to detect the diffuse flux up 30 degree Galactic latitude. Its sensitivity will be sufficient for detection of the gamma-ray counterpart of the Galactic component of the IceCube astrophysical neutrino signal above 10 TeV. We also propose that a dedicated IACT system composed of small but wide field-of-view telescopes could be used for mapping the 10-100 TeV the diffuse gamma-ray emission from across all the sky.

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