infrared and submillimetre from the lensed z= 2.3 submillimetre galaxy SMM J2135− 0102.
We obtain very high signal-to-noise ratio detections of 11 transitions from three species and
limits on a further 20 transitions from nine species. We use the 12CO,[C i] and HCN line
strengths to investigate the gas mass, kinematic structure and interstellar medium (ISM)
chemistry and find strong evidence for a two-phase medium within this high-redshift …