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

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${}^{\prime }$ (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.

18 pages, 12 figures, accepted for publication in the MNRAS

References in corpus (15)

• The distance to the Orion Nebula
• Filamentary structure of star-forming complexes
• Physical properties of molecular clouds for the entire Milky Way disk
• A Large Catalog of Accurate Distances to Local Molecular Clouds: The Gaia DR2 Edition
• The Large and Small Scale Structures of Dust in the Star-Forming Perseus Molecular Cloud
• Magnetically Regulated Star Formation in 3D: The Case of Taurus Molecular Cloud Complex
• A Large Catalog of Accurate Distances to Molecular Clouds from PS1 Photometry
• Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
• Infall Motions in Massive Star-Forming Regions: Results from Years 1 & 2 of the MALT90 Survey
• The width of Herschel filaments varies with distance
• On the typical width of Herschel filaments
• Massive 70 micron quiet clumps I: evidence of embedded low/intermediate-mass star formation activity
• Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
• The JCMT BISTRO Survey: An 850/450$\mu$m Polarization Study of NGC 2071IR in OrionB
• The Kinematic and Chemical Properties of a Potential Core-Forming Clump: Perseus B1-E

Cited by in corpus (1)

• Evolution of compressed clouds formed by filament coalescence. I. Oblique collisions