arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.3964astro-ph.HE
收藏

用费米卫星高能观测确定超高能宇宙射线的约束源

Constraining Sources of Ultra High Energy Cosmic Rays Using High Energy Observations with the Fermi Satellite

Asaf Pe'er, Abraham Loeb

摘要:

我们分析的条件,使粒子加速到超高能量,~10^{20} eV(UHECR)。我们表明,宽带光子数据最近提供的WMAP,ISOCAM,雨燕和费米卫星,产量的活动星系核(AGN)的能力,以产生UHECR的限制。高能(MeV-GeV)光子由发射的低能光子与宇宙微波背景或河外背景光的康普顿散射产生。因此,在高和低光子能量下的光度的比率可以用作加速站点中的物理条件的探针。我们发现,现有的数据排除了核心区域附近的射电响亮AGN作为可能的加速地点的UHECR质子。然而,我们表明,巨大的射电瓣不排除。我们将我们的方法应用于Cen A,并表明质子加速到~10^{20} eV只能发生在距离核心>~ 100 kpc处。

英文摘要:

We analyze the conditions that enable acceleration of particles to ultra-high energies, ~10^{20} eV (UHECRs). We show that broad band photon data recently provided by WMAP, ISOCAM, Swift and Fermi satellites, yield constraints on the ability of active galactic nuclei (AGN) to produce UHECRs. The high energy (MeV - GeV) photons are produced by Compton scattering of the emitted low energy photons and the cosmic microwave background or extra-galactic background light. The ratio of the luminosities at high and low photon energies can therefore be used as a probe of the physical conditions in the acceleration site. We find that existing data excludes core regions of nearby radio-loud AGN as possible acceleration sites of UHECR protons. However, we show that giant radio lobes are not excluded. We apply our method to Cen A, and show that acceleration of protons to ~10^{20} eV can only occur at distances >~ 100 kpc from the core.

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。

↑