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HII regions are particularly interesting because they can generate denselayers of gas and dust, elongated columns or pillars of gas pointing towardsthe ionizing sources, and cometary globules of dense gas, where triggered starformation can occur. Understanding the interplay between the ionizing radiationand the dense surrounding gas is very important to explain the origin of thesepeculiar structures, and hence to characterize triggered star formation.G46.5-0.2 (G46), a poorly studied galactic HII region located at about 4 kpc,is an excellent target to perform this kind of studies. Using public moleculardata extracted from the Galactic Ring Survey (13CO J=1-0) and from the JamesClerk Maxwell Telescope data archive (12CO, 13CO, C18O J=3-2, HCO+ and HCNJ=4-3), and infrared data from the GLIMPSE and MIPSGAL surveys, we perform acomplete study of G46, its molecular environment and the young stellar objectsplaced around it. We found that G46, probably excited by an O7V star, islocated close to the edge of the GRSMC G046.34-00.21 molecular cloud. Itpresents a horse-shoe morphology opening in direction of the cloud. We observeda filamentary structure in the molecular gas likely related to G46 and notconsiderable molecular emission towards its open border. We found that about10' towards the southwest of G46 there are some pillar-like features, shiningat 8 um and pointing towards the HII region open border. We propose that thepillar-like features were carved and sculpted by the ionizing flux from G46. Wefound several young stellar objects likely embedded in the molecular cloudgrouped in two main concentrations: one, closer to the G46 open borderconsisting of Class II type sources, and other one mostly composed by Class Itype YSOs located just ahead the pillars-like features, strongly suggesting anage gradient in the YSOs distribution.

HII region G46.5-0.2: the interplay between ionizing radiation, molecular gas and star formation