The Discovery of a New Massive Molecular Gas Component Associated with the Submillimeter Galaxy SMM J02399-0136

We thank our colleagues at the Green Bank Observatory, who have made these observations possible. We greatly appreciate the staff at the North American ALMA Science Center, who calibrated the raw ALMA visibilities. The Green Bank Observatory and the National Radio Astronomy Observatory are facilities of the National Science Foundation operated under cooperative agreements by Associated Universities, Inc. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2013.1.00403.S, ADS/JAO.ALMA #2015.1.00302.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The optical image is based on observations obtained with the NASA/ESA Hubble Space Telescope, retrieved from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. R.J.I. acknowledges ERC funding in the form of Advance Grant COSMICISM (321302). I.R.S. acknowledges support from the ERC Advance Grant DUSTYGAL (321334), a Royal Society/Wolfson Award, and STFC(ST/P000541/1).