论文标题
重新访问L183无星核的磁场
Revisiting the Magnetic Field of the L183 Starless Core
论文作者
论文摘要
我们介绍了从850 $ $ $ $ $ $ $ $ $ l183的尘埃热发射中的线性极化的观察结果。这些数据是在James Clerk Maxwell望远镜（JCMT）上使用的，使用Imbillimetre普通用户钢计阵列2（Scuba-2）摄像头与其Polarimeter Pol-2结合使用。极化尘埃发射追踪云中的天平面磁场结构，从而使我们能够研究磁场在其无星核的形成和演变中的作用。为了解释这些测量值，我们首先通过结合JCMT和$ \ textit {Herschel} $空间天文台获得的光谱能量分布来计算L183中的灰尘温度和柱密度。我们使用Davis-Chandrasekhar-Fermi技术来测量云的五个子区域的磁场强度，我们发现在与先前研究协议中，从$ \ sim120 \ pm18〜μg $到$ \ sim270 \ pm64〜μg $不等。结合$ \ sim 1.5 \ sim 1.5 \ times 10^{22} $ cm $^{ - 2} $的平均氢柱密度（$ n _ {\ text {h} _2} $），我们还发现所有五个子区域都具有巨大的亚属性。这些结果表明，L183中的磁场足够强，可以反对云的重力塌陷。
We present observations of linear polarization from dust thermal emission at 850 $μm$ towards the starless cloud L183. These data were obtained at the James Clerk Maxwell Telescope (JCMT) using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera in conjunction with its polarimeter POL-2. Polarized dust emission traces the plane-of-sky magnetic field structure in the cloud, thus allowing us to investigate the role of magnetic fields in the formation and evolution of its starless core. To interpret these measurements, we first calculate the dust temperature and column density in L183 by fitting the spectral energy distribution obtained by combining data from the JCMT and the $\textit{Herschel}$ space observatory. We used the Davis-Chandrasekhar-Fermi technique to measure the magnetic field strength in five sub-regions of the cloud, and we find values ranging from $\sim120\pm18~μG$ to $\sim270\pm64~μG$ in agreement with previous studies. Combined with an average hydrogen column density ($N_{\text{H}_2}$) of $\sim 1.5 \times 10^{22} $cm$^{-2}$ in the cloud, we also find that all five sub-regions are magnetically subcritical. These results indicate that the magnetic field in L183 is sufficiently strong to oppose the gravitational collapse of the cloud.
