Title: A low-mass hub-filament with double centre revealed in NGC2071-North Show Chinese title

Title: 在NGC 2071-北发现的具有双中心的低质量星团丝状结构

Abstract: We present the first analysis in NGC2071-North as a resolved hub-filament featuring a double centre. This $\sim 1.5 \times 1.5$ parsec-scale filament hub contains $\sim$500 $M_\odot$. Seen from Planck, magnetic field lines may have facilitated the gathering of material at this isolated location. The energy balance analysis, supported by infalling gas signatures, reveal that these filaments are currently forming stars. Herschel 100 $\mu$m emission concentrates in the hub, at IRAS 05451+0037 and LkH$\alpha$ 316, and presents diffuse lobes and loops around them. We suggest that such a double centre could be formed, because the converging locations of filament pairs are offset, by 2.3$'$ (0.27 pc). This distance also matches the diameter of a hub-ring, seen in column density and molecular tracers, such as HCO$^+$(1$-$0) and HCN(1$-$0), that may indicate a transition and the connection between the hub and the radiating filaments. We argue that all of the three components of the emission star LkH$\alpha$ 316 are in physical association. We find that a $\sim$0.06 pc-sized gas loop, attached to IRAS 05451+0037, can be seen at wavelengths all the way from Pan-STARRS-i to Herschel-100 $\mu$m. These observations suggest that both protostars at the double hub centre are interacting with the cloud material. In our $^{13}$CO data, we do not seem to find the outflow of this region that was identified in the 80s with much lower resolution. Show Chinese abstract

Abstract: 我们首次分析了NGC 2071-北作为一个具有双中心的解析星云枢纽-细丝结构。这个$\sim 1.5 \times 1.5$尺度的细丝状星云枢纽包含$\sim$500$M_\odot$。从普朗克观测来看，磁场线可能有助于在此孤立位置聚集物质。能量平衡分析，结合吸积气体的特征，表明这些细丝正在形成恒星。赫歇尔100$\mu$米发射集中在星云枢纽上，在IRAS 05451+0037和LkH$\alpha$316处尤为集中，并在其周围呈现出弥漫的瓣状和环状结构。我们认为这种双中心结构可能是由于细丝对的汇聚位置错开了2.3$'$（0.27 pc）。 这一距离也与密度柱和分子示踪剂（如 HCO$^+$(1$-$0) 和 HCN(1$-$0)）中的 hub-ring 直径相匹配，这可能表明了 hub 和辐射丝之间的过渡和连接。 我们认为发射星 LkH$\alpha$ 316 的三个组成部分在物理上是相关的。 我们发现一个 $\sim$0.06 pc 大小的气体环，附着在 IRAS 05451+0037 上，在从 Pan-STARRS-i 到 Herschel-100 $\mu$m 的所有波长下都可以看到。这些观测结果表明，双 hub 中心的两个原恒星都在与云材料相互作用。 在我们的 $^{13}$CO 数据中，似乎没有找到 80 年代以更低分辨率识别出的该区域的外流。