Early Science with the Large Millimeter Telescope: Discovery of the 12CO(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, Aeree Chung

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report an early science discovery of the 12CO(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 H2-deficient. The choice of CO-to-H2 conversion factors cannot explain the apparent H2 deficiency in its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, is either largely deficient in both H2 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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ring galaxies
star formation
molecular gases
telescopes
gas
star formation rate
instrument receivers
interacting galaxies
negative feedback
monatomic gases
galactic evolution
gas density
bursts
actuators
science
histories
galaxies
stars
augmentation
rings

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wong, O. Ivy ; 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, Aeree. / Early Science with the Large Millimeter Telescope : Discovery of the 12CO(1-0) emission line in the ring galaxy VIIZw466. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 466, No. 1. pp. 574-580.
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abstract = "We report an early science discovery of the 12CO(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 H2-deficient. The choice of CO-to-H2 conversion factors cannot explain the apparent H2 deficiency in its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, is either largely deficient in both H2 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.",
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Wong, OI, Vega, O, Sánchez-Argüelles, D, Narayanan, G, Wall, WF, Zwaan, MA, Rosa González, D, Zeballos, M, Bekki, K, Mayya, YD, Montaña, A & Chung, A 2017, 'Early Science with the Large Millimeter Telescope: Discovery of the 12CO(1-0) emission line in the ring galaxy VIIZw466', Monthly Notices of the Royal Astronomical Society, vol. 466, no. 1, pp. 574-580. https://doi.org/10.1093/mnras/stw3142

Early Science with the Large Millimeter Telescope : Discovery of the 12CO(1-0) emission line in the ring galaxy VIIZw466. / Wong, O. Ivy; 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, Aeree.

In: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 1, 01.01.2017, p. 574-580.

Research output: Contribution to journalArticle

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T2 - Discovery of the 12CO(1-0) emission line in the ring galaxy VIIZw466

AU - Wong, O. Ivy

AU - Vega, O.

AU - Sánchez-Argüelles, D.

AU - Narayanan, G.

AU - Wall, W. F.

AU - Zwaan, M. A.

AU - Rosa González, D.

AU - Zeballos, M.

AU - Bekki, K.

AU - Mayya, Y. D.

AU - Montaña, A.

AU - Chung, Aeree

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N2 - We report an early science discovery of the 12CO(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 H2-deficient. The choice of CO-to-H2 conversion factors cannot explain the apparent H2 deficiency in its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, is either largely deficient in both H2 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.

AB - We report an early science discovery of the 12CO(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 H2-deficient. The choice of CO-to-H2 conversion factors cannot explain the apparent H2 deficiency in its entirety. Hence, we find that the collisional ring galaxy, VII Zw466, is either largely deficient in both H2 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.

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