Uncovering distinct environments in an extended physical system around the W33 complex
L. K. Dewangan, T. Baug, D. K. Ojha

TL;DR
This study investigates a large-scale molecular cloud system around W33, revealing two distinct environments and evidence of star formation triggered by converging cloud flows.
Contribution
It provides a multi-wavelength analysis identifying two separate environments and the role of cloud collisions in star formation around W33.
Findings
Identification of two distinct environments with different dust temperatures.
Evidence of multiple velocity components and their spatial connection.
Signs of star formation activity linked to cloud-cloud collision scenarios.
Abstract
We present a multi-wavelength investigation of a large-scale physical system containing the W33 complex. The extended system (~50 pc x 37 pc) is selected based on the distribution of molecular gas at [29.6, 60.2] km/s and of 88 ATLASGAL 870 micron dust clumps at d ~2.6 kpc. The extended system/molecular cloud traced in the maps of 13CO and C18O emission contains several HII regions excited by OB stars (age ~0.3-1.0 Myr) and a thermally supercritical filament ("fs1", length ~17 pc). The filament, devoid of the ionized gas, shows dust temperature (T_d) of ~19 K, while the HII regions are depicted with T_d of ~21-29 K. It suggests the existence of two distinct environments in the cloud. The distribution of Class I young stellar objects (mean age ~0.44 Myr) traces the early stage of star formation (SF) toward the cloud. At least three velocity components (around 35, 45, and 53 km/s) are…
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