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We report an early science discovery of the CO(1-0) emission line in thecollisional ring galaxy, VII Zw466, using the Redshift Search Receiverinstrument on the Large Millimeter Telescope Alfonso Serrano.The apparentmolecular-to-atomic gas ratio either places the ISM of VII Zw466 in theHI-dominated regime or implies a large quantity of CO-dark molecular gas, givenits high star formation rate. The molecular gas densities and star formationrate densities of VII Zw466 are consistent with the standard Kennicutt-Schmidtstar formation law even though we find this galaxy to be H2-deficient. Thechoice of CO-to-H2 conversion factors cannot explain the apparent H2 deficiencyin its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, iseither largely deficient in both H2 and HI or contains a large mass of CO-darkgas. A low molecular gas fraction could be due to the enhancement of feedbackprocesses from previous episodes of star formation as a result of thestar-forming ISM being confined to the ring. We conclude that collisional ringgalaxy formation is an extreme form of galaxy interaction that triggers astrong galactic-wide burst of star formation that may provide immediatenegative feedback towards subsequent episodes of star formation---resulting ina short-lived star formation history or, at least, the appearance of amolecular gas deficit.

Early Science with the Large Millimeter Telescope: discovery of the 12CO(1-0) emission line in the ring galaxy, VIIZw466