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

O. Ivy Wong, O. Vega, D. Sánchez-Argüelles, G. Narayanan, W. F. Wall, M. A. Zwaan, D. Rosa González, M. Zeballos, K. Bekki, Y. D. Mayya, A. Montaña, A. Chung

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Abstract

We report an early science discovery of the 12 CO(1-0) emission line in the collisional ring galaxy VII Zw466, using the Redshift Search Receiver instrument on the Large Millimeter Telescope Alfonso Serrano. The apparent molecular-to-atomic gas ratio either places the interstellar medium (ISM) of VII Zw466 in the HI-dominated regime or implies a large quantity of CO-dark molecular gas, given its high star formation rate. The molecular gas densities and star formation rate densities of VII Zw466 are consistent with the standard Kennicutt-Schmidt star formation law even though we find this galaxy to be H 2 -deficient. The choice of CO-to-H 2 conversion factors cannot explain the apparent H 2 deficiency in its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, is either largely deficient in both H 2 and HI or contains a large mass of CO-dark gas. A low molecular gas fraction could be due to the enhancement of feedback processes from previous episodes of star formation as a result of the star-forming ISM being confined to the ring. We conclude that collisional ring galaxy formation is an extreme form of galaxy interaction that triggers a strong galactic-wide burst of star formation that may provide immediate negative feedback towards subsequent episodes of star formation - resulting in a short-lived star formation history or, at least, the appearance of a molecular gas deficit.

Original languageEnglish
Pages (from-to)574-580
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wong, O. I., Vega, O., Sánchez-Argüelles, D., Narayanan, G., Wall, W. F., Zwaan, M. A., Rosa González, D., Zeballos, M., Bekki, K., Mayya, Y. D., Montaña, A., & Chung, A. (2017). Early Science with the Large Millimeter Telescope: Discovery of the 12 CO(1-0) emission line in the ring galaxy VIIZw466. Monthly Notices of the Royal Astronomical Society, 466(1), 574-580. https://doi.org/10.1093/mnras/stw3142