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G45.45+0.06 is an ultra-compact HII (UCHII) region extensively studied. It isknown that G45.45+0.06 is embedded in a complex of UCHII regions, but up thedate, the surrounding ISM in a larger spatial scale has not been analyzed.Using data from large-scale surveys: Two Micron All Sky Survey, GLIMPSE,MIPSGAL, MAGPIS and GRS, we performed a multiwavelength study of a region about7' x 7'in the vicinity of G45.45+0.06. We found that the UCHII complex lies ina border of a larger (diameter of ~ 3') and fainter HII region, which islocated at the same distance as G45.45+0.06, ~ 8 kpc. In this work, this largerHII region was called G45L. A good morphological correlation is observedbetween the PDRs and the molecular gas mapped in the 13CO J=1--0 and CS J=2--1lines, suggesting that G45L may be collecting the molecular material. From anear- and mid-IR photometric study, we found three sources, likely O-typestars, that are possibly responsible for the creation of G45L. Additionally wefound several YSO candidates lying preferently in the molecular shell thatsurrounds G45L. Our results confirm that the region southeastern the UCHIIcomplex where G45.45+0.06 is embedded and eastern G45L is active in starformation. We suggest that G45L has been expanding during about 2 x 10^6 yr andcould have triggered the formation of the zero-age main sequence stars that areionizing the UCHII region G45.45+0.06. However we can not discard that both HIIregions are coeval.

The environs of the ultracompact HII region G45.45+0.06