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arXiv 0707.1689astro-ph
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LS 5039中TeV辐射的形成

On the formation of TeV radiation in LS 5039

Dmitry Khangulyan, Felix Aharonian, Valenti Bosch-Ramon

摘要:

最近从致密双星系统中探测到的TeV伽马射线表明,相对论性外流(喷流或风)是粒子有效加速到多TeV能量的场所。本文讨论了LS 5039中超相对论电子的加速和辐射条件。LS 5039是一个γ射线发射双星系统,它有最高质量的TeV数据。假设伽马射线发射器是一个类似喷气的结构,我们进行了详细的数值计算的能谱和光变曲线占的加速效率,加速器的位置,发射流的速度,系统的倾角,以及相关的各向异性逆康普顿散射和对生产的具体功能。我们的结论是,加速器不应该深入的二元系统,除非我们假设一个非常有效的加速率。我们表明,在IC的情况下,伽马射线光谱和通量是强烈的轨道相位依赖。形式上,我们的模型可以再现,为特定的参数值集,能量谱的伽玛射线HESS报告的宽轨道相位间隔。然而,源的物理性质只能通过能够提供窄轨道相位间隔($Δϕ\ll 0.1$)的详细能谱的观测来约束。

英文摘要:

The recent detections of TeV gamma-rays from compact binary systems show that relativistic outflows (jets or winds) are sites of effective acceleration of particles up to multi-TeV energies. In this paper, we discuss the conditions of acceleration and radiation of ultra-relativistic electrons in LS 5039, the gamma-ray emitting binary system for which the highest quality TeV data are available. Assuming that the gamma-ray emitter is a jet-like structure, we performed detailed numerical calculations of the energy spectrum and lightcurves accounting for the acceleration efficiency, the location of the accelerator, the speed of the emitting flow, the inclination angle of the system, as well as specific features related to anisotropic inverse Compton scattering and pair production. We conclude that the accelerator should not be deep inside the binary system unless we assume a very efficient acceleration rate. We show that within the IC scenario both the gamma-ray spectrum and flux are strongly orbital phase dependent. Formally, our model can reproduce, for specific sets of parameter values, the energy spectrum of gamma-rays reported by HESS for wide orbital phase intervals. However, the physical properties of the source can be constrained only by observations capable of providing detailed energy spectra for narrow orbital phase intervals ($Δϕ\ll 0.1$).

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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