Embedded Stellar Populations towards Young Massive Star Formation Regions I. G305.2 0.2 - AstrophysicsReport as inadecuate




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Abstract: We present deep, wide-field J, H and Ks images taken with IRIS2 on the AngloAustralian Telescope, towards the massive star formation region G305.2+0.2.Combined with 3.6, 4.5, 5.8 and 8.0 micron data from the GLIMPSE survey on theSpitzer Space Telescope, we investigate the properties of the embedded stellarpopulations. After removing contamination from foreground stars we separate thesources based on their IR colour. Strong extended emission in the GLIMPSEimages hampers investigation of the most embedded sources towards the knownsites of massive star formation. However, we find a sizeable population of IRexcess sources in the surrounding region free from these completeness effects.Investigation reveals the recent star formation activity in the region is morewidespread than previously known.Stellar density plots show the embedded cluster in the region, G305.24+0.204,is offset from the dust emission. We discuss the effect of this cluster on thesurrounding area and argue it may have played a role in triggering sites ofstar formation within the region. Finally, we investigate the distribution ofIR excess sources towards the cluster, in particular their apparent lacktowards the centre compared with its immediate environs.



Author: S. N. Longmore, M. Maercker, S. Ramstedt, M.G. Burton 1 UNSW-ATNF 2 Stockholm Observatory 3 Stockholm Observatory 4 UNSW-Armagh O

Source: https://arxiv.org/



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