PAHs as tracers of the molecular gas in star-forming galaxies

I. Cortzen, J. Garrett, G. Magdis, D. Rigopoulou, F. Valentino, M. Pereira-Santaella, F. Combes, A. Alonso-Herrero, S. Toft, E. Daddi, D. Elbaz, C. Gómez-Guijarro, M. Stockmann, J. Huang, C. Kramer