Evolution of a neutrino-cooled disc in gamma-ray bursts
Evolution of a neutrino-cooled disc in gamma-ray bursts
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DOI：
10.1111/j.1365-2966.2004.08377.x
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发表时间：
2004-06
影响因子：
4.8
通讯作者：
A. Janiuk;R. Perna;T. Matteo;B. Czerny
中科院分区：
文献类型：
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作者：
A. Janiuk;R. Perna;T. Matteo;B. Czerny
快速的超爱丁顿吸积很可能为伽马射线暴（GRB）的中心引擎提供动力。在密度和温度的极端条件下，吸积环是由中微子发射而不是辐射冷却的。另一个重要的冷却机制是能量平流进入中心黑洞。我们计算了中微子占主导地位的光盘，在爆发过程中进行的时间演化，并调查其密度和温度的变化。短暴和长暴之间的区别是根据物质流入圆盘外部的不同速率来进行的，因此有利于短暴的二元合并方案和长暴的Bracksar方案。在背景下的GRB模型，我们还研究了剩余光盘的光子光度的演变到倍的GRB D，我们讨论了它的影响伽玛射线暴光谱中的发射线的生产。
Rapid, hyper-Eddington accretion is likely to power the central engines of gamma-ray bursts (GRBs). In the extreme conditions of densities and temperatures the accreting torus is cooled by neutrino emission rather than by radiation. Another important cooling mechanism is the advection of energy into the central black hole. We compute the time evolution of a neutrino-dominated disc that proceeds during the burst and investigate the changes in its density and temperature. The discrimination between short and long bursts is made on the basis of the different rates of material inflow to the outer parts of the disc, thus favouring the binary merger scenario for the short GRBs and the collapsar scenario for the long GRBs. Within the context of the collapsar model, we also study the evolution of the photon luminosity of the remnant disc up to times of ∼ I d, and we discuss its implications for the production of emission lines in GRB spectra.