Probing the interstellar medium of high-redshift sub-millimetre and emission line galaxies

Abstract

Utilizing new ALMA-ACA observations of the [N II] 205 µm line in combination with existing [C II] 158 µm observations, we characterize the L_{[C II]}/L_{[N II]} distribution in highredshift sub-millimetre galaxies. Our measurements are consistent with existing literature of high-redshift L_{[C II]}/L_{[N II]} . Compared to local (U)LIRGs, our measurements find higher luminosity ratios which indicates a key difference in physical parameters of the interstellar medium. We also present the first stages of a wide-field narrow-band emission line survey using CFHT WIRCam, including details of its initial success.