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Abstract: Ultra compact HII UCHII regions are indicators of high-mass star formationsites and are distributed mainly in the Galactic plane. We intend toinvestigate the possible contribution of the forthcoming ESA Planck mission tothe science of UCHII regions by evaluating the possibility of detecting UCHIIsthat are bright in the radio regime. We performed new 7 mm observations of asample of UCHII regions. For each source in our sample, the free-free radiospectrum has been modeled. Along with far-IR measurements, our spectra allow usto estimate the flux densities of the sources in the millimeter andsub-millimeter bands. The possibility of Planck detecting the selected sourcescan be assessed by comparing the estimated flux densities to the expectedsensitivity in each Planck channel. We conclude that, in the case of thepresent sample, located close to the Galactic center, Planck will have a verylow detection rate. In contrast, assuming that our sample is representative ofthe whole UCHII-region population, we derive a very high probability ofdetecting this kind of source with Planck if located instead close to theanticenter.



Autor: P. Leto 1,2, G. Umana 1, C. Trigilio 1, C. S. Buemi 1, S. Dolei 3, P. Manzitto 3, L. Cerrigone 4, C. Siringo 3 1 INAF - Osservato

Fuente: https://arxiv.org/







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