Inefficient star formation: the combined effects of magnetic fields and radiative feedback
Inefficient star formation: the combined effects of magnetic fields and radiative feedback
复制标题
低效的恒星形成：磁场和辐射反馈的综合影响
DOI：
10.1111/j.1365-2966.2009.14969.x
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发表时间：
2009
影响因子：
4.8
通讯作者：
M. Bate
中科院分区：
文献类型：
--
作者：
Daniel J. Price;M. Bate
我们利用自引力辐射磁流体动力学计算研究了磁场和辐射原星反馈对恒星形成过程的影响。我们展示了在不同磁场强度以及有或没有辐射传输的情况下 50 M⊙ 分子云的塌缩 e 的一系列计算结果。我们发现磁场和辐射对恒星的形成都有巨大的影响，尽管这两种影响在很多方面是互补的。磁场主要为低密度气体提供大尺度支持，而辐射则通过提高原恒星附近高密度材料的温度来强烈抑制小尺度破碎。在强磁场和辐射反馈的情况下，最终的结果是恒星形成过程效率低下，恒星形成率为 。每个自由落体时间 10% 接近观测到的速率，尽管我们只能跟踪恒星形成开始之后 1/3 自由落体时间的计算。
We investigate the effects of magnetic fields and radiative p rotostellar feedback on the star formation process using self-gravitating radiation magnetohydrodynamical calculations. We present results from a series of calculations of the collaps e of 50 M⊙ molecular clouds with various magnetic field strengths and with and without radiat ive transfer. We find that both magnetic fields and radiation have a dramatic impact on star formation, though the two effects are in many ways complementary. Magnetic fields primarily provide support on large scales to low density gas, whereas radiation is found to strongly suppress small-scale fragmentation by increasing the temperature in the high-density material near the protostars. With strong magnetic fields and radiative feedb ack the net result is an inefficient star formation process with a star formation rate of . 10% per free-fall time that approaches the observed rate, although we have only been able to follow the calculations for 1/3 of a free-fall time beyond the onset of star formation.