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Aims. To increase the observational samples of star formation aroundexpanding Hii regions, we analyzed the interstellar medium and star formationaround N22.  Methods. We used data extracted from the seven large-scale surveys frominfrared to radio wavelengths. In addition we used the JCMT observations of theJ = 3-2 line of 12CO emission data released on CADC and the 12CO J = 2-1 and J=3-2 lines observed by the KOSMA 3 m telescope. We performed a multiwavelengthstudy of bubble N22.  Results. A molecular shell composed of several clumps agrees very well withthe border of N22, suggesting that its expansion is collecting the surroundingmaterial. The high integrated 12CO line intensity ratio (ranging from 0.7 to1.14) implies that shocks have driven into the molecular clouds. We identifyeleven possible O-type stars inside the Hii region, five of which are locatedin projection inside the cavity of the 20 cm radio continuum emission and areprobably the exciting-star candidates of N22. Twenty-nine YSOs (young stellarobjects) are distributed close to the dense cores of N22. We conclude that starformation is indeed active around N22; the formation of most of YSOs may havebeen triggered by the expanding of the Hii region. After comparing thedynamical age of N22 and the fragmentation time of the molecular shell, wesuggest that radiation-driven compression of pre-existing dense clumps may beongoing.

The infrared dust bubble N22: an expanding HII region and the star formation around it