Abstract

FUENTE, E. de la et al. Unveiling the hot molecular core in the ultracompact H II region with extended emission G12.21-0.10. Rev. mex. astron. astrofis [online]. 2018, vol.54, n.1. ISSN 0185-1101.

We present a multiwavelength study of the cometary H II region G12.21-0.10 using the VLA and OVRO. Both radio continuum (0.3, 0.7, 2 and 3.6 cm) and spectral lines of H41α, 13CS(2−1) & (1−0), and NH3(2,2) & (4,4) observations are included. We find two 3 mm continuum peaks toward G12.21-0.10; one of them is spatially coincident with the UC H II region, while the other coincides spatially with a molecular clump. We also find that the 0.7, 2 and 3.6 cm continuum and H41α line are only detected toward the UC H II region, while the 13CS, and NH3 are spatially associated with the molecular clump. Based on the morphology, kinetic temperature (≈86 K), volumetric density (≈1.5×106 cm−3) and linear size (≈0.22 pc) of the molecular clump, we suggest this source is consistent with a hot molecular core.

Keywords : ISM: clouds; ISM: molecules; molecular processes; radio continuum: ISM; radio lines: ISM; stars: formation.