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We present Atacama Large Millimeter Array (ALMA) observations of twohigh-redshift systems (SMMJ02399-0136 and the Cloverleaf QSO) in theirrest-frame 122 micron continuum (~650 GHz or ~450 micron on-sky) and [NII] 122micron line emission. The continuum observations with a synthesized beam of~0.25" resolve both sources and recover the expected flux. The Cloverleaf isresolved into a partial Einstein ring, while the SMMJ02399-0136 isunambiguously separated into two components; an AGN associated point source andan extend region at the location of a previously identified dusty starburst. Wedetect the [NII] line in both systems, though significantly weaker than ourprevious detections made with the 1st generation z(Redshift) and Early UniverseSpectrometer. We show that this discrepancy is mostly explained if the lineflux is resolved out due to significantly more extended emission and longerALMA baselines than expected. Based on the ALMA observations we determine thatgreater than 75% of the total [NII] line flux in each source is produced viastar formation. We use the [NII] line flux that is recovered by ALMA toconstrain the N/H abundance, ionized gas mass, hydrogen ionizing photon rate,and star formation rate. In SMMJ02399-0136 we discover it contains asignificant amount (~1000 solar masses per year) of unobscured star formationin addition to its dusty starburst and argue that SMMJ02399-0136 may be similarto the Antennae Galaxies (Arp 244) locally. In total these observations providea new look at two well-studied systems while demonstrating the power andchallenges of Band-9 ALMA observations of high-z systems.

Band-9 ALMA observations of the [NII] 122 micron line and FIR continuum in two high-z galaxies