A Chandra X-ray and Infrared Study of the Stellar Population in the
  High-Mass Star Forming Region IRAS 16562-3959
  We present the results from Chandra X-ray observations, and near- and
mid-infrared analysis, using VISTA/VVV and Spitzer/GLIMPSE catalogs, of the
high-mass star-forming region IRAS 16562-3959, which contains a candidate for a
high mass protostar. We detected 249 X-ray sources within the ACIS-I
field-of-view. The majority of the X-ray sources have low count rates (< 0.638
cts/ks), and hard X-ray spectra. The search for YSOs in the region using
VISTA/VVV and Spitzer/GLIMPSE catalogs resulted in a total of 799 YSOs, with 66
Class I and 733 Class II YSOs. The search for near- and mid-infrared
counterparts of the X-ray sources led to a total of 165 VISTA/VVV counterparts,
and a total of 151 Spitzer/GLIMPSE counterparts. The infrared analysis of the
X-ray counterparts allowed us to add an extra 123 YSOs associated with the
region. We conclude that a total of 922 YSOs are associated with the region,
with 67 Class I, 764 Class II, and 91 Class III YSOs. We also found that the
region is composed of 11 subclusters. In the vicinity of the high-mass
protostar, the stellar distribution has a core-halo structure. The subcluster
containing the high-mass protostar is the densest and the youngest in the
region, and the high-mass protostar is located at its center. The YSOs in this
cluster appear to be substantially older than the high mass protostar.
