原恒星中高能质子、放射性核素和磁活动
Energetic Protons, Radionuclides and Magnetic Activity in Protostellar Disks
摘要：
我们计算的位置的磁不活跃的死区在最小质量的原太阳盘，电离的情况下，包括恒星X射线，长或短寿命的放射性核素衰变，和高能质子到达一般的星际介质，从附近的超新星爆炸，从磁盘日冕，或从年轻恒星的日冕。在所有的情况下，除了那些小的尘埃颗粒被去除和一小部分短寿命的放射性核素留在气体中的情况外，圆盘都包含一个死区。所有的情况下，无一例外都有一个“不死区”，在那里，中等的磁致伸缩性防止磁旋转湍流，同时允许剪切产生的大规模磁场。不死区中的质量柱通常大于湍流表面层中的质量柱。这些结果支持了这样一种观点，即死区和不死区是质量柱超过1000 g/cm ^2的冷尘气体的强大后果。
英文摘要：
We calculate the location of the magnetically-inactive dead zone in the minimum-mass protosolar disk, under ionization scenarios including stellar X-rays, long- or short-lived radionuclide decay, and energetic protons arriving from the general interstellar medium, from a nearby supernova explosion, from the disk corona, or from the corona of the young star. The disk contains a dead zone in all scenarios except those with small dust grains removed and a fraction of the short-lived radionuclides remaining in the gas. All the cases without exception have an "undead zone" where intermediate resistivities prevent magneto-rotational turbulence while allowing shear-generated large-scale magnetic fields. The mass column in the undead zone is typically greater than the column in the turbulent surface layers. The results support the idea that the dead and undead zones are robust consequences of cold, dusty gas with mass columns exceeding 1000 g/cm^2.
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