Multi-scale observational study of G45.804−0.355 star-forming region

Abstract

This is a multi-wavelength study to examine the G45.804−0.355 massive star-forming region (SFR) and its environs. Using MeerKAT with angular resolution (θ) of 8 at 1.28 GHz, we identify for the first time, a faint radio continuum emission core in G45.804−0.355. At 1.3 mm, ALMA observations (θ∼0. 7) resolved the core into multiple dust continuum condensations including MM1 which was found to be the primary massive dust dense core in the region (mass Mc ∼ 54.3 M). The dust continuum shows an arm-like extended emission within which other dense cores are situated. The velocity gradient of the MM1 core indicates that the source is associated with a rotation gas motion. The red- and blue-shifted lobes overlap at the position of MM1. The compact morphology of the 4.5 μm IR emission, the presence of spiral arms and overlapping of the red- and blue-shifted lobes suggest a face-on geometry of G45.804−0.355.