Embedded Stellar Populations towards Young Massive Star Formation Regions I. G305.2+0.2

TL;DR

This study uses infrared imaging and Spitzer data to analyze embedded stellar populations in the G305.2+0.2 star formation region, revealing widespread recent star formation and the influence of clusters on their environment.

Contribution

It provides a detailed analysis of embedded stellar populations in G305.2+0.2 using combined infrared data, highlighting the spatial distribution and potential star formation triggers.

Findings

Widespread recent star formation activity detected.

Embedded cluster G305.24+0.204 is offset from dust emission.

IR excess sources are less common at the cluster center.

Abstract

We present deep, wide-field J, H and Ks images taken with IRIS2 on the Anglo Australian 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 the Spitzer Space Telescope, we investigate the properties of the embedded stellar populations. After removing contamination from foreground stars we separate the sources based on their IR colour. Strong extended emission in the GLIMPSE images hampers investigation of the most embedded sources towards the known sites of massive star formation. However, we find a sizeable population of IR excess sources in the surrounding region free from these completeness effects. Investigation reveals the recent star formation activity in the region is more widespread 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 the surrounding area and argue it may have played a role in triggering sites of star formation within the region. Finally, we investigate the distribution of IR excess sources towards the cluster, in particular their apparent lack towards the centre compared with its immediate environs.