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We present APEX observations of HCN (9-8) and (4-3) lines toward a sample ofhot cores. The spectral shapes of the main transitions are asymmetric andself-absorbed, as expected for high optical depth in a possibly infallingenvelope. For spherical symmetry, the large column densities of these sourceswould mean that the central region is obscured by dust above a certainfrequency. However, we detected the vibrationally excited satellite lines(v_2=1; J=9-8) at 797 GHz, which originate from the inner regions. Thisindicates that high-frequency ALMA observations of hot core centers will befeasible.

Hot Cores in the submm - obscured by dust?