# Observational signatures of cloud-cloud collision in the extended star-forming region S235

Source: [Observational signatures of cloud-cloud collision in the extended star-forming region S235](<https://www.sota2.com/research/paper/68fa36b51e209131ce8ac4e6>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T21:59:11.502Z

Authors: L. K. Dewangan, D. K. Ojha

Published: 2017-09-19T04:45:07.000Z

## Abstract

We present a multi-wavelength data analysis of the extended star-forming region S235 (hereafter E-S235), where two molecular clouds are present. In E-S235, using the 12CO (1-0) and 13CO (1-0) line data, a molecular cloud linked with the site "S235main" is traced in a velocity range \[-24, -18\] km s^{-1}, while the other one containing the sites S235A, S235B, and S235C (hereafter "S235ABC") is depicted in a velocity range \[-18, -13\] km s^{-1}. In the velocity space, these two clouds are separated by ~4 km s^{-1}, and are interconnected by a lower intensity intermediate velocity emission, tracing a broad bridge feature. In the velocity channel maps, a possible complementary molecular pair at \[-21, -20\] km s^{-1} and \[-16, -15\] km s^{-1} is also evident. The sites, "S235ABC", East 1, and South-West are spatially seen in the interface of two clouds. Together, these observed features are consistent with the predictions of numerical models of the cloud-cloud collision (CCC) process, favoring the onset of the CCC in E-S235 about 0.5 Myr ago. Deep UKIDSS near-infrared photometric analysis of point-like sources reveals significant clustering of young stellar populations toward the sites located at the junction, and the "S235main". The sites, "S235ABC" harbor young compact H II regions having dynamical ages of ~0.06-0.22 Myr, and these sites (including South-West and East 1) also contain dust clumps (having M\_clump ~40 to 635 M\_sun). Our observational findings suggest that the star formation activities (including massive stars) appear to be influenced by the CCC mechanism at the junction.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1709.06251>)

[PDF](<https://arxiv.org/pdf/1709.06251.pdf>)