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We present Early Science observations with the Large Millimeter Telescope,AzTEC 1.1 mm continuum images and wide bandwidth spectra (73-111 GHz) acquiredwith the Redshift Search Receiver, towards four bright lensed submillimetregalaxies identified through the Herschel Lensing Survey-snapshot and theSCUBA-2 Cluster Snapshot Survey. This pilot project studies the star formationhistory and the physical properties of the molecular gas and dust content ofthe highest redshift galaxies identified through the benefits of gravitationalmagnification. We robustly detect dust continuum emission for the full sampleand CO emission lines for three of the targets. We find that one source showsspectroscopic multiplicity and is a blend of three galaxies at differentredshifts (z=2.040, 3.252 and 4.680), reminiscent of previous high-resolutionimaging follow-up of unlensed submillimetre galaxies, but with a completelydifferent search method, that confirm recent theoretical predictions ofphysically unassociated blended galaxies. Identifying the detected lines as12CO (J_up=2-5) we derive spectroscopic redshifts, molecular gas masses, anddust masses from the continuum emission. The mean H_2 gas mass of the fullsample is (2.0 +- 0.2) x 10^11 M_sun/\mu, and the mean dust mass is (2.0+-0.2)x 10^9 M_sun/\mu, where \mu=2-5 is the expected lens amplification. Using theseindependent estimations we infer a gas-to-dust ratio of \delta_GDR=55-75, inagreement with other measurements of submillimetre galaxies. Our magnifiedhigh-luminosity galaxies fall on the same locus as other high-redshiftsubmillimetre galaxies, extending the L'_CO - L_FIR correlation observed forlocal luminous and ultraluminous infrared galaxies to higher FIR and COluminosities.

monthly notices of the royal astronomical society

Early Science with the Large Millimeter Telescope: Observations of dust  continuum and CO emission lines of cluster-lensed submillimetre galaxies at  z=2.0-4.7