无星核II的磁场畸变：FeSt 1-457的三维磁场结构
Distortion of Magnetic Fields in a Starless Core II: 3D Magnetic Field Structure of FeSt 1-457
摘要：
分子云和分子核的三维磁场信息对于揭示分子云和分子核在重力作用下的运动学稳定性（磁支撑）具有重要意义，而这是研究恒星形成初始条件的基础。在目前的研究中，致密的无星核心FeSt 1-457的三维磁场结构的基础上确定的近红外偏振观测的二向色偏振的背景恒星和简单的三维建模。利用获得的$45^{\circ}\pm10^{\circ}$的视线磁倾斜轴$θ_{\rm inc}$的角度和先前确定的$23.8\pm12.1$ $μ{\rm G}$的天空平面磁场强度$B_{\rm pol}$，导出FeSt 1-457的总磁场强度为$33.7\pm18.0$ $μ{\rm G}$。使用磁性和热/湍流载体评估的FeSt 1-457的临界质量为${M}_{\rm cr} = 3.70\pm0.92$ ${\rm M}_{\odot}$，其与观察到的核心质量$M_{\rm core}=3.55\pm0.75$ ${\rm M}_{\odot}$相同。因此，我们得出结论，FeSt 1-457的稳定性处于接近临界状态的条件下。没有下沉的气体运动，也没有相关的年轻恒星，核心被认为处于恒星形成的最早阶段，即，在达到超临界状态后，动力学崩溃开始之前的阶段。这些特性将使FeSt 1-457成为未来研究恒星形成初始条件的最佳无星核心之一。
英文摘要：
Three dimensional (3D) magnetic field information on molecular clouds and cores is important for revealing their kinematical stability (magnetic support) against gravity which is fundamental for studying the initial conditions of star formation. In the present study, the 3D magnetic field structure of the dense starless core FeSt 1-457 is determined based on the near-infrared polarimetric observations of the dichroic polarization of background stars and simple 3D modeling. With an obtained angle of line-of-sight magnetic inclination axis $θ_{\rm inc}$ of $45^{\circ}\pm10^{\circ}$ and previously determined plane-of-sky magnetic field strength $B_{\rm pol}$ of $23.8\pm12.1$ $μ{\rm G}$, the total magnetic field strength for FeSt 1-457 is derived to be $33.7\pm18.0$ $μ{\rm G}$. The critical mass of FeSt 1-457, evaluated using both magnetic and thermal/turbulent support is ${M}_{\rm cr} = 3.70\pm0.92$ ${\rm M}_{\odot}$, which is identical to the observed core mass, $M_{\rm core}=3.55\pm0.75$ ${\rm M}_{\odot}$. We thus conclude that the stability of FeSt 1-457 is in a condition close to the critical state. Without infalling gas motion and no associated young stars, the core is regarded to be in the earliest stage of star formation, i.e., the stage just before the onset of dynamical collapse following the attainment of a supercritical condition. These properties would make FeSt 1-457 one of the best starless cores for future studies of the initial conditions of star formation.
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