PULS is an observational survey of a sample of local universe Ultra/Luminous Infrared Galaxies (U/LIRGs) using different molecular species such as CO, HCN and HCO+. Observations have been taken with the IRAM Plateau de Bure Interferometer (PdBI).
Image: HST image of the well known ULIRG Arp 220 with 12CO(2-1) emission overlaid. Credits: Based on observations made with the NASA/ESA Hubble Space Telescope, and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). PdBI observations of Downes & Solomon (1998).