Spatial location of the YSOs identified with Spitzer. Sources with red crosses are those with an age estimate. Sources with a red square are the YSOs with an age <3 Myr, and blue are the YSO with an age >3 Myr. The green diamond is a Methanol maser (Caswell et al. 2010), and the violet diamond (off the GSAOI fields) is a water maser (Breen et al. 2011). Other masers have been detected outside the GSAOI field in the northwest part of the cluster. White crosses show the massive stars spectroscopically identified by Roman-Lopez et al. (2009). Dotted lines show MSX isophotes at 14.7 μm (band D).The full-line circle at the edge 14.7 μm emission identify the contour of the young main cluster region.
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