Context.To investigate the process of star formation triggered by the expansion of an H ii region, we present a multi-wavelength analysis of the Galactic H ii region RCW 120 and its surroundings. The collect and collapse model predicts that the layer of gas and dust accumulated between the ionization and shock fronts during the expansion of the H ii region collapses and forms dense fragments, giving rise to potential sites of massive-star formation.
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Zavagno et al. (2007) studied this question.
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