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We present 8.5 arcsec resolution 1.1mm continuum imaging and CO spectroscopicredshift measurements of eight extremely bright submillimetre galaxiesidentified from the Planck and Herschel surveys, taken with the LargeMillimeter Telescope's AzTEC and Redshift Search Receiver instruments. Wecompiled a candidate list of high redshift galaxies by cross-correlating thePlanck Surveyor mission's highest frequency channel (857 GHz, FWHM = 4.5arcmin) with the archival Herschel Spectral and Photometric Imaging Receiver(SPIRE) imaging data, and requiring the presence of a unique, single Herschelcounterpart within the 150 arcsec search radius of the Planck source positionswith 350 micron flux density larger than 100 mJy, excluding known blazars andforeground galaxies. All eight candidate objects observed are detected in 1.1mmcontinuum by AzTEC bolometer camera, and at least one CO line is detected inall cases with a spectroscopic redshift between 1.3 < z(CO) < 3.3. Theirinfrared spectral energy distributions mapped using the Herschel and AzTECphotometry are consistent with cold dust emission with characteristictemperature between $T_d$ = 43 K and 84 K. With apparent infrared luminosity ofup to L(IR) = $3\times10^{14} \mu^{-1} L_\odot$, they are some of the mostluminous galaxies ever found (with yet unknown gravitational magnificationfactor $\mu$). The analysis of their spectral energy distributions (SEDs)suggests that star formation is powering the bulk of their extremely large IRluminosities. Derived molecular gas masses of $M_{H2}=(0.6-7.8)\times 10^{11}M_\odot$ (for $\mu$~10) also make them some of the most gas-rich high redshiftgalaxies ever detected.

Early Science with the Large Millimeter Telescope: Observations of Extremely Luminous High-z Sources Identified by Planck