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arXiv 0809.5124astro-phhep-ph
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从甚高能量$γ$ -射线的宇宙学

Cosmology from very high energy $γ$-rays

Xiao-Jun Bi, Qiang Yuan

摘要:

在这项工作中,我们研究如何的宇宙学参数,哈勃常数$H_0$,可以通过观察非常高的能量(VHE)$γ$ -射线在TeV的规模约束。VHE $γ$射线在星系际空间传播过程中,通过产生$e^+e^-$对,受到背景辐射场的衰减。该效应与VHE $γ$射线穿过的距离成比例。因此,TeV $γ$ -射线的吸收可以作为宇宙学距离的指示,来约束宇宙学参数。利用大气切伦科夫望远镜对两颗具有较好光谱测量结果的耀变体Mrk 501和1 ES 1101-232进行了研究,以约束$H_0$。本文所采用的约束哈勃常数的机制与以往的Ia型超新星观测和宇宙微波背景等方法有很大不同。然而,在$2σ$水平上,我们的结果与其他方法一致。

英文摘要:

In this work we study how the cosmological parameter, the Hubble constant $H_0$, can be constrained by observation of very high energy (VHE) $γ$-rays at the TeV scale. The VHE $γ$-rays experience attenuation by background radiation field through $e^+e^-$ pair production during the propagation in the intergalactic space. This effect is proportional to the distance that the VHE $γ$-rays go through. Therefore the absorption of TeV $γ$-rays can be taken as cosmological distance indicator to constrain the cosmological parameters. Two blazars Mrk 501 and 1ES 1101-232, which have relatively good spectra measurements by the atmospheric Cerenkov telescope, are studied to constrain $H_0$. The mechanism constraining the Hubble constant adopted here is very different from the previous methods such as the observations of type Ia supernovae and the cosmic microwave background. However, at $2σ$ level, our result is consistent with other methods.

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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