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It has been shown that by means of different physical mechanisms theexpansion of HII regions can trigger the formation of new stars of all masses.This process may be important to the formation of massive stars but has neverbeen quantified in the Galaxy. We use Herschel-PACS and -SPIRE images from theHerschel Infrared survey of the Galactic plane, Hi-GAL, to perform this study.We combine the Spitzer-GLIMPSE and -MIPSGAL, radio-continuum and sub-millimetersurveys such as ATLASGAL with Hi-GAL to study Young Stellar Objects (YSOs)observed towards Galactic HII regions. We select a representative HII region,N49, located in the field centered on l=30 degr observed as part of the Hi-GALScience Demonstration Phase, to demonstrate the importance Hi-GAL will have tothis field of research. Hi-GAL PACS and SPIRE images reveal a new population ofembedded young stars, coincident with bright ATLASGAL condensations. The Hi-GALimages also allow us, for the first time, to constrain the physical propertiesof the newly formed stars by means of fits to their spectral energydistribution. Massive young stellar objects are observed at the borders of theN49 region and represent second generation massive stars whose formation hasbeen triggered by the expansion of the ionized region. Hi-GAL enables us todetect a population of young stars at different evolutionary stages, coldcondensations only being detected in the SPIRE wavelength range. The far IRcoverage of Hi-GAL strongly constrains the physical properties of the YSOs. Thelarge and unbiased spatial coverage of this survey offers us a uniqueopportunity to lead, for the first time, a global study of star formationtriggered by HII regions in our Galaxy.

Star formation triggered by HII regions in our Galaxy: First results for N49 from the Herschel infrared survey of the Galactic plane