Star-forming site RAFGL 5085: Is a perfect candidate of hub-filament system ?

Abstract

To investigate the star formation process, we present a multi-wavelength study of a massive star-forming site RAFGL 5085, which has been associated with the molecular outflow, HII region, and near-infrared cluster. The continuum images at 12, 250, 350, and 500 $\mu$m show a central region (having M${}_{\mathrm{clump}}$ $\sim$225 M${}_{\odot }$) surrounded by five parsec-scale filaments, revealing a hub-filament system (HFS). In the {\it Herschel} column density ($N({\mathrm{H}}_2)$) map, filaments are identified with higher aspect ratios (length/diameter) and lower $N({\mathrm{H}}_2)$ values ($\sim$0.1--2.4 $\times$10${}^{21}$ cm${}^{-2}$), while the central hub is found with a lower aspect ratio and higher $N({\mathrm{H}}_2)$ values ($\sim$3.5--7.0 $\times$10${}^{21}$ cm${}^{-2}$). The central hub displays a temperature range of [19, 22.5]~K in the {\it Herschel} temperature map, and is observed with signatures of star formation (including radio continuum emission). The JCMT ${}^{13}$CO(J= 3--2) line data confirm the presence of the HFS and its hub is traced with supersonic and non-thermal motions having higher Mach number and lower thermal to non-thermal pressure ratio. In the ${}^{13}$CO position-velocity diagrams, velocity gradients along the filaments toward the HFS appear to be observed, suggesting the gas flow in the RAFGL 5085 HFS and the applicability of the clump-fed scenario.

15 pages, 8 figures; Accepted for publication in Journal of Astrophysics and Astronomy (JOAA)

References in corpus (19)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• Filamentary structure of star-forming complexes
• Star formation through gravitational collapse and competitive accretion
• The Mass Distribution and Lifetime of Prestellar Cores in Perseus, Serpens, and Ophiuchus
• The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
• The Origin of Massive Stars: The Inertial-Inflow Model
• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• Cluster Formation Triggered by Filament Collisions in Serpens South
• Velocity-coherent Filaments in NGC 1333: Evidence for Accretion Flow?
• Study of morphology and stellar content of the Galactic HII region IRAS 16148-5011
• New insights in the HII region G18.88-0.49: hub-filament system and accreting filaments
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions-IX. A pilot study towards IRDC G034.43+00.24 on multi-scale structures and gas kinematics
• Star formation in the Sh 2-53 region influenced by accreting molecular filaments
• Simultaneous evidence of edge collapse and hub-filament configurations: A rare case study of a Giant Molecular Filament G45.3+0.1
• Hub-filament system in IRAS 05480+2545: young stellar cluster and 6.7 GHz methanol maser
• CO Outflow Candidates Toward the W3/4/5 Complex I: The Sample and its Spatial Distribution
• The disk-outflow system around the rare young O-type protostar W42-MME
• Unraveling the inner substructure of new candidate hub-filament system in the HII region G25.4NW

Cited by in corpus (1)

• AFGL 5180 and AFGL 6366S: sites of hub-filament systems at the opposite edges of a filamentary cloud