标题： 由环绕恒星质量黑洞的盘状天体发出的磁驱动风的质量损失 显示英文标题

标题： Mass loss from a magnetically driven wind emitted by a disk orbiting a stellar mass black hole

摘要： 宇宙伽马射线暴（以下简称GRB）的起源通常被认为是一个由厚盘物质吸积的恒星质量黑洞。这种系统如何产生相对论性喷流的机制仍不清楚。我们在此研究了一种提议，即磁场被放大到非常大的值 \( B \, \text\{\sim \} \, 10^\{15\} \, \text\{G\} \)，从而提取盘的能量。基于一些非常简单的假设，我们计算了沿磁场线的质量损失率，然后估计了无穷远处的洛伦兹因子\Gamma 。我们发现，只有当磁场几何结构和能量注入条件受到严格的限制时，\Gamma 才能达到高值。我们在不同GRB情景的背景下讨论了这些结果。 显示英文摘要

摘要： The source of cosmic gamma-ray bursts (hereafter GRBs) is usually believed to be a stellar mass black hole accreting material from a thick disk. The mechanism for the production of a relativistic wind by such a system is still unknown. We investigate here one of the proposal where the disk energy is extracted by a magnetic field amplified to very large values B \sim 10^15 G. Using some very simple assumptions we compute the mass loss rate along magnetic field lines and then estimate the Lorentz factor \Gamma at infinity. We find that \Gamma can reach high values only if severe constraints on the field geometry and the conditions of energy injection are satisfied. We discuss the results in the context of different scenarios for GRBs.