热压力在喷气发射中的作用
The role of thermal pressure in jet launching
摘要：
我提出并讨论了一个统一的计划，喷气发射的基础上随机耗散的吸积盘动能，主要是通过冲击波。在这个方案中，被称为热发射喷流模型，吸积质量的动能被转换为内能，例如，热能或磁能。内能使一小部分吸积物质加速到高速并形成喷流。例如，热能形成加速气体的压力梯度。第二加速阶段是可能的，其中初级流出拉伸磁场线。然后，磁力线重新连接，并将少量的质量加速到非常高的速度。这种两级加速过程可能会从黑洞和中子星形成高度相对论性的喷流。该模型预测，对发射喷流的吸积褐矮星的详细分析将显示质量吸积速率大于10^{-9}-10 ^{-8} Mo/年，这高于文献中目前的说法。
英文摘要：
I present and discuss a unified scheme for jet launching that is based on stochastic dissipation of the accretion disk kinetic energy, mainly via shock waves. In this scheme, termed thermally-launched jet model, the kinetic energy of the accreted mass is transferred to internal energy, e.g., heat or magnetic energy. The internal energy accelerates a small fraction of the accreted mass to high speeds and form jets. For example, thermal energy forms a pressure gradient that accelerates the gas. A second acceleration stage is possible wherein the primary outflow stretches magnetic field lines. The field lines then reconnect and accelerate small amount of mass to very high speeds. This double-stage acceleration process might form highly relativistic jets from black holes and neutron stars. The model predicts that detail analysis of accreting brown dwarfs that launch jets will show the mass accretion rate to be larger than 10^{-9}-10^{-8} Mo/year, which is higher than present claims in the literature.
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