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arXiv 1111.5470astro-ph.HE
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在伽马射线暴中心发动机中磁化中微子冷却环面的吸积和流出

Accretion and outflow from a magnetized, neutrino cooled torus in the gamma ray burst central engine

Agnieszka Janiuk, Monika Moscibrodzka

摘要:

伽马射线暴(GRB)是一种能量极高的瞬变事件,从宇宙中最遥远的地方都能看到。它们很可能是由超爱丁顿速率的吸积提供动力的,这种吸积作用会进入一个新诞生的恒星质量的黑洞。这个中央引擎产生了最强大的,高洛伦兹因子的喷流,负责高能伽马射线的发射。利用广义相对论中的二维磁流体力学模拟,研究了伽玛暴中央发动机中吸积流的演化。我们计算了极热、极密的环面吸积到快速旋转的黑洞上的结构和演化,黑洞发射磁化喷流。我们计算的化学结构的磁盘和帐户中微子冷却。我们的初步运行适用于短GRB的情况下(残留环面增生后,NS NS或NS BH合并)。我们对选定的盘和中心BH质量估计了这样一个事件的中微子光度

英文摘要:

Gamma Ray Bursts (GRB) are the extremely energetic transient events, visible from the most distant parts of the Universe. They are most likely powered by accretion on the hyper-Eddington rates that proceeds onto a newly born stellar mass black hole. This central engine gives rise to the most powerful, high Lorentz factor jets that are responsible for energetic gamma ray emission. We investigate the accretion flow evolution in GRB central engine, using the 2D MHD simulations in General Relativity. We compute the structure and evolution of the extremely hot and dense torus accreting onto the fast spinning black hole, which launches the magnetized jets. We calculate the chemical structure of the disk and account for neutrino cooling. Our preliminary runs apply to the short GRB case (remnant torus accreted after NS-NS or NS-BH merger). We estimate the neutrino luminosity of such an event for chosen disk and central BH mass

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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