Published online by Cambridge University Press: 04 October 2008
High- and low-density tracer molecules have been observed in (Ultra-) Luminous Infrared Galaxies in order to initiatemulti-molecule multi-transition studies to evaluate the physical and chemical environment of the nuclear medium and the ongoing nuclear activity. The data, augmented with data available in the literature, are presented in Baan et al. (2007), which also presents a first order analysis. Here, we present the chemical analysis of the J = 1–0 transition lines of HCN, HNC, and HCO+.