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arXiv 1107.0645astro-ph.HE
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金牛座T星是gamma-ray发射体吗?

Are T Tauri stars gamma-ray emitters?

María Victoria del Valle, Gustavo E. Romero, Pedro Luis Luque-Escamilla, Josep Martí, Juan Ramón Sánchez-Sutil

摘要:

金牛座T星是年轻的低质量前主序星,被吸积盘包围。这些天体呈现出强烈的磁活动和强大的磁重联事件。强烈的冲击可能与恒星磁层的快速重联有关。这样的冲击可以将粒子加速到相对论能量。我们的目标是建立一个简单的模型来计算金牛T星环境中非热相对论粒子产生的辐射。我们想确定这种辐射是否可以用现有的或即将到来的伽马射线望远镜在高能量下探测到。我们假设在重联事件中被预加速的粒子(质子和电子)在冲击中通过费米机制被加速,并研究了由主导辐射过程产生的高能辐射。我们计算的光谱能量分布的金牛座T星的高能量和我们比较的积分通量从一个特定的费米源,1FGL J1625.8- 2429 c,我们暂时与这种年轻的恒星物体(YSO)。我们认为,在合理的一般条件下,附近的金牛T星可能会被检测到在高能量和负责一些不明的费米源的银河系平面上。

英文摘要:

T Tauri stars are young, low mass, pre-main sequence stars surrounded by an accretion disk. These objects present strong magnetic activity and powerful magnetic reconnection events. Strong shocks are likely associated with fast reconnection in the stellar magnetosphere. Such shocks can accelerate particles up to relativistic energies. We aim at developing a simple model to calculate the radiation produced by non-thermal relativistic particles in the environment of T Tauri stars. We want to establish whether this emission is detectable at high energies with the available or forthcoming gamma-ray telescopes. We assume that particles (protons and electrons) pre-accelerated in reconnection events are accelerated at shocks through Fermi mechanism and we study the high-energy emission produced by the dominant radiative processes. We calculate the spectral energy distribution of T Tauri stars up to high-energies and we compare the integrated flux obtained with that from a specific Fermi source, 1FGL J1625.8-2429c, that we tentatively associate with this kind of young stellar objects (YSOs). We suggest that under reasonable general conditions nearby T Tauri stars might be detected at high energies and be responsible for some unidentified Fermi sources on the Galactic plane.

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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