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We present a multiwavelength investigation of the hub-filament system RCW 117(IRAS 17059-4132), which shows intricate filamentary features in thefar-infrared, mapped using Herschel images. We obtain the column density anddust temperature maps for the region using the Herschel images, and identify 88cores and 12 filaments from the column density map of the region($18'\times18'$). We employ the ThrUMMS $^{13}$CO (J=1-0) data for probing thekinematics in RCW 117, and find velocity gradients ($\sim 0.3-1$ km s$^{-1}$pc$^{-1}$) with hints of matter inflow along the filamentary structures.Ionised gas emission from the associated HII region is examined using the GiantMetrewave Radio Telescope (GMRT) at 610 and 1280 MHz, and is found to be ofextent $5 \times 3$ pc$^2$ with intensity being brightest towards the hub. Weestimate the peak electron density towards the hub to be $\sim 750$ cm$^{-3}$.Thirty four Class 0/I young stellar objects (YSOs) have been identified in theregion using the Spitzer GLIMPSE colour-colour diagram, with many lying alongthe filamentary structures. Based on the (i) presence of filamentarystructures, (ii) distribution of cores across the region, with $\sim39$% foundalong the filamentary structures, (iii) massive star-formation tracers in thehub, and (iv) the kinematics, we believe that global hierarchical collapse canplausibly explain the observed features in RCW 117.

Massive star-formation in the hub-filament system of RCW 117