磁场催化大质量黑洞的形成与增长
Magnetic fields catalyze massive black hole formation and growth
AI总结：
该研究提出原星系核区的大尺度磁场可通过直接坍缩和磁增强吸积促进超大质量黑洞形成与早期增长，抑制碎裂和恒星形成，为DCBH种子及AGN供能提供新机制。
摘要：
原星系核区的大尺度磁场可以通过直接坍缩和磁增强吸积促进超大质量黑洞（SMBHs）的形成和早期增长。与引力内落和恒星形成相关的湍流可以将均方根场强驱动至与平均气体动能均分；该磁场具有自组织成大型相干结构的一般趋势。如果场的极向分量（相对于恒星形成盘的转动轴）在尺度$\lesssim r$上组织化并达到盘内湍流能量约百分之几的能量，则预期发电机效应会产生磁力矩，从而能够增加内流速度并使盘增厚。吸积流能够以足以产生并增长大质量直接坍缩黑洞（DCBH）种子并随后以高速率为活动星系核（AGN）供能的速度将物质输送到质心，而不会变得引力不稳定。因此，碎裂和恒星形成被抑制，并且不一定耗尽吸积流的物质供应，这与通过盘吸积增长和供养超大质量黑洞的主流模型形成对比。
英文摘要：
Large-scale magnetic fields in the nuclear regions of protogalaxies can promote the formation and early growth of supermassive black holes (SMBHs) by direct collapse and magnetically boosted accretion. Turbulence associated with gravitational infall and star formation can drive the rms field strength toward equipartition with the mean gas kinetic energy; this field has a generic tendency to self-organize into large, coherent structures. If the poloidal component of the field (relative to the rotational axis of a star-forming disc) becomes organized on scales $\lesssim r$ and attains an energy of order a few percent of the turbulent energy in the disc, then dynamo effects are expected to generate magnetic torques capable of increasing the inflow speed and thickening the disc. The accretion flow can transport matter toward the center of mass at a rate adequate to create and grow a massive direct-collapse black hole (DCBH) seed and fuel the subsequent AGN at a high rate, without becoming gravitationally unstable. Fragmentation and star formation are thus suppressed and do not necessarily deplete the mass supply for the accretion flow, in contrast to prevailing models for growing and fueling SMBHs through disc accretion.
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