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By means of different physical mechanisms, the expansion of HII regions canpromote the formation of new stars of all masses. RCW 120 is a nearby GalacticHII region where triggered star formation occurs. This region is well-studied -there being a wealth of existing data - and is nearby. However, it issurrounded by dense regions for which far infrared data is essential to obtainan unbiased view of the star formation process and in particular to establishwhether very young protostars are present. We attempt to identify all YoungStellar Objects (YSOs), especially those previously undetected at shorterwavelengths, to derive their physical properties and obtain insight into thestar formation history in this region. We use Herschel-PACS and -SPIRE imagesto determine the distribution of YSOs observed in the field. We use a spectralenergy distribution fitting tool to derive the YSOs physical properties.Herschel-PACS and -SPIRE images confirm the existence of a young source andallow us to determine its nature as a high-mass (8-10 MSun) Class 0 object(whose emission is dominated by a massive envelope) towards the massivecondensation 1 observed at (sub)-millimeter wavelengths. This source was notdetected at 24 micron and only barely seen in the MISPGAL 70 micron data.Several other red sources are detected at Herschel wavelengths and coincidewith the peaks of the millimeter condensations. SED fitting results for thebrightest Herschel sources indicate that, apart from the massive Class 0 thatforms in condensation 1, young low mass stars are forming around RCW 120. TheYSOs observed on the borders of RCW 120 are younger than its ionizing star,which has an age of about 2.5 Myr.

Star formation triggered by the Galactic HII region RCW 120: First results from the Herschel Space Observatory