Abstract

VAZZANO, M. M. et al. Millimeter and far-ir study of the IRDC SDC341.232-0.268. Rev. mex. astron. astrofis [online]. 2019, vol.55, n.2, pp.289-303.  Epub Nov 25, 2020. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2019.55.02.15.

We analyze the molecular gas and dust associated with the infrared dark cloud SDC341.232-0.268 in order to investigate the characteristics and parameters of the gas, determine the evolutionary status of four embedded EGO candidates, and establish possible infall or outflow gas motions. We base our study on 12CO(2-1), 13CO(2-1), and C18O(2-1) data obtained with the APEX telescope, molecular data of high density tracers from the MALT90 survey and IR images from Spitzer, Herschel and ATLASGAL. The study reveals two clumps at −44 km s−1 towards the IRDC, with densities of > 104cm−3, typical of IRDCs, while high density tracers show H2 densities > 105. FIR images reveals the presence of cold dust linked to the molecular clumps and EGOs. A comparison of the spectra of the optically thin and optically thick molecular lines towards the EGOs suggests the existence of infall and outflow motions.

Keywords : dust; extinction.