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We study the properties of the interstellar medium in the interacting systemBR1202-0725 at z=4.7 via its [NII] and [CII] fine-structure line emission. Thissystem consists of a QSO, a sub-mm galaxy (SMG), and two Ly-alpha emitters(LAEs). Such a diversity in galaxy properties makes BR1202-0725 a uniquelaboratory of star formation and galaxy evolution at high redshift. We presentionized nitrogen ([NII] 205 micron) observations of this system, obtained withthe IRAM Plateau de Bure Interferometer. We find no [NII] emission at thequasar location, but tentative [NII] line detections associated with the SMGand one of the LAEs. Together with available ionized carbon ([CII] 158 micron)ALMA observations of this system, we find the following: The [CII]/[NII]luminosity ratio is >5.5 for the QSO and the SMG, but it is as low as ~2 in theLAE, suggesting that, in this source, most of the [CII] emission is associatedwith the ionized medium (HII regions) rather than the neutral one (PDRs). Thisstudy demonstrates the importance of combined studies of multiplefine--structure lines in order to pin down the physical properties of theinterstellar medium in distant galaxies.

Varying [CII]/[NII] line ratios in the interacting system BR1202-0725 at z=4.7