Paper:	Large-scale Shocks in NGC 253: The First Interferometer SiO Map of an External Galaxy
Volume:	197, XVth IAP Meeting Dynamics of Galaxies: From the Early Universe to the Present
Page:	189
Authors:	García-Burillo, S.
Abstract:	The nucleus of the starburst spiral NGC253 has been mapped in the v = 0,J = 2-1 line of SiO, a privileged tracer of shock chemistry, using the IRAM interferometer. Our map, that includes simultaneous observations of H13CO+, shows that SiO comes from a 600pc circumnuclear disk (CND) displaying a rich hierarchy of substructures and a distorted kinematics. The chemical history of the starburst is analysed studying the ratio R = N(SiO) / N(H13CO+), strongly variable within the CND. The processing of gas by large-scale shocks is discussed.

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