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arXiv 2301.00481astro-ph.GAastro-ph.SR
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在NGC2071-North中发现了一个低质量的双中心丝

A low-mass hub-filament with double centre revealed in NGC2071-North

Vera Könyves, Derek Ward-Thompson, Yoshito Shimajiri, Pedro Palmeirim, Philippe André

摘要:

我们提出的第一个分析在NGC 2071-北作为一个解决枢纽灯丝具有双中心。该$\sim 1.5 \times 1.5$秒差距级灯丝座包含$\sim$ 500 $M_\odot$。从普朗克的角度来看,磁力线可能促进了物质在这个孤立位置的聚集。能量平衡分析得到了下落气体特征的支持,揭示了这些细丝目前正在形成恒星。Herschel 100 $μ$ m发射集中在IRAS 05451+0037和LkH $α$ 316处的中心,并在它们周围呈现弥散的瓣和环。我们认为,这样一个双中心可以形成,因为会聚的位置的灯丝对偏移,由2.3 $'$(0.27 pc)。该距离也与毂环的直径相匹配,如柱密度和分子示踪剂,如HCO $^+$(1 $-$ 0)和HCN(1 $-$ 0)中所示,这可能表明毂和辐射丝之间的过渡和连接。我们认为,所有的三个组成部分的发射星LkH $α$ 316是在物理协会。我们发现,一个$\sim$ 0.06 pc大小的气体环,连接到IRAS 05451+0037,可以看到从泛星-i到赫歇尔-100 $μ$ m的波长。这些观测结果表明,双枢纽中心的两颗原恒星都与云物质相互作用。在我们的$^{13}$ CO数据中,我们似乎没有发现80年代以低得多的分辨率确定的该区域的流出。

英文摘要:

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 $μ$m emission concentrates in the hub, at IRAS 05451+0037 and LkH$α$ 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$-$0) and HCN(1$-$0), that may indicate a transition and the connection between the hub and the radiating filaments. We argue that all of the three components of the emission star LkH$α$ 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 $μ$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.

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