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We present the results of a morphological study performed to a sample ofUltracompact (UC) HII regions with Extended Emission (EE) using Spitzer--IRACimagery and 3.6 cm VLA conf. D radio-continuum (RC) maps. Some examples of thecomparison between maps and images are presented. Usually there is an IR pointsource counterpart to the peak(s) of RC emission, at the position of the UCsource. We find that the predominant EE morphology is the cometary, and in mostcases is coincident with IR emission at 8.0 $\mu$m. Preliminary results ofSpitzer--IRAC photometry of a sub-sample of 13 UC HII regions with EE based onGLIMPSE legacy data are also presented. Besides, individual IRAC photometry wasperformed to 19 UC sources within these 13 regions. We show that UC sources lieon specific locus, both in IRAC color-color and AM-product diagnostic diagrams.Counts of young stellar sources are presented for each region, and we concludethat a proportion of ~ 2%, ~10%, and ~88% of sources in the UC HII regions withEE are, in average, Class I, II, and III, respectively.

Spitzer--IRAC Imagery and Photometry of Ultracompact HII Regions With Extended Emission