Relative alignment between dense molecular cores and ambient magnetic field: the synergy of numerical models and observations
Relative alignment between dense molecular cores and ambient magnetic field: the synergy of numerical models and observations
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致密分子核心和环境磁场之间的相对排列：数值模型和观测的协同作用
DOI：
10.1093/mnras/staa835
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发表时间：
2020
影响因子：
4.8
通讯作者：
Scibelli, Samantha
中科院分区：
文献类型：
--
作者：
Chen, Che-Yu;Behrens, Erica A;Washington, Jasmin E;Fissel, Laura M;Friesen, Rachel K;Li, Zhi-Yun;Pineda, Jaime E;Ginsburg, Adam;Kirk, Helen;Scibelli, Samantha
磁场在恒星形成过程中的作用是天体物理学中的一个重要课题。我们研究了恒星形成核心的方向（由核心长轴定义）与环境磁场方向之间的相关性(i)三维磁流体动力学模拟，（ii）模拟在不同视角下生成的合成观测，以及（iii）附近分子云的观测。研究发现，合成观测中岩心与背景磁场的相对排列结果与全三维模拟数据略有不同，部分原因是在投影二维图中识别的岩心往往在丝状结构中共存，而三维岩心通常更圆。此外，我们在模拟中考察了磁场从pc到岩心尺度的递进，这与气体倾向于沿磁场向致密岩心流动的各向异性岩心形成模型是一致的。通过比较绿岸氨巡天观测到的地核和普朗克极化推断的磁场取向，我们发现不同云之间的相对地核-磁场排列具有区域依赖性。更具体地说，我们发现金牛座分子云中的致密核心倾向于垂直于背景磁场，而英仙座和蛇夫座的分子云则倾向于随机（英仙座）或稍微平行（蛇夫座）的磁场方向。我们认为这种相对核场方向的特征可以用来探测云内磁场的相对意义。
The role played by magnetic field during star formation is an important topic in astrophysics. We investigate the correlation between the orientation of star-forming cores (as defined by the core major axes) and ambient magnetic field directions in (i) a 3D magnetohydrodynamic simulation, (ii) synthetic observations generated from the simulation at different viewing angles, and (iii) observations of nearby molecular clouds. We find that the results on relative alignment between cores and background magnetic field in synthetic observations slightly disagree with those measured in fully 3D simulation data, which is partly because cores identified in projected 2D maps tend to coexist within filamentary structures, while 3D cores are generally more rounded. In addition, we examine the progression of magnetic field from pc to core scale in the simulation, which is consistent with the anisotropic core formation model that gas preferably flows along the magnetic field towards dense cores. When comparing the observed cores identified from the Green Bank Ammonia Survey andPlanckpolarization-inferred magnetic field orientations, we find that the relative core–field alignment has a regional dependence among different clouds. More specifically, we find that dense cores in the Taurus molecular cloud tend to align perpendicular to the background magnetic field, while those in Perseus and Ophiuchus tend to have random (Perseus) or slightly parallel (Ophiuchus) orientations with respect to the field. We argue that this feature of relative core–field orientation could be used to probe the relative significance of the magnetic field within the cloud.
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DOI：
10.1088/0004-637x/806/1/31
发表时间：
2015-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Gong;E. Ostriker
通讯作者：
M. Gong;E. Ostriker
扩展的巴纳德 5 星形成核心的超大阵列观测：揭示了嵌入的细丝
DOI：
10.1088/2041-8205/739/1/l2
发表时间：
2011
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
J. Pineda;A. Goodman;H. Arce;P. Caselli;S. Longmore;S. Corder
通讯作者：
S. Corder
DOI：
10.1088/0004-637x/742/2/105
发表时间：
2011-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
H. Arce;M. Borkin;A. Goodman;J. Pineda;Christopher Beaumont
通讯作者：
H. Arce;M. Borkin;A. Goodman;J. Pineda;Christopher Beaumont
DOI：
10.3847/1538-4357/aac8da
发表时间：
2018-06
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Kristina Monsch;J. Pineda;H. Liu;C. Zucker;H. Chen;K. Pattle;S. Offner;J. di Francesco;A. Ginsburg;B. Ercolano;H. Arce;R. Friesen;H. Kirk;P. Caselli;A. Goodman
通讯作者：
Kristina Monsch;J. Pineda;H. Liu;C. Zucker;H. Chen;K. Pattle;S. Offner;J. di Francesco;A. Ginsburg;B. Ercolano;H. Arce;R. Friesen;H. Kirk;P. Caselli;A. Goodman
亚临界磁云中塌缩核的形成：双极扩散的三维磁流体动力学模拟
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
T. Kudoh;S. Basu
通讯作者：
S. Basu