Early Science with the Large Millimeter Telescope: COOL BUDHIES I - a pilot study of molecular and atomic gas at z ≃ 0.2

Ryan Cybulski, Min S. Yun, Neal Erickson, Victor De la Luz, Gopal Narayanan, Alfredo Montaña, David Sánchez, Jorge A. Zavala, Milagros Zeballos, Aeree Chung, Ximena Fernández, Jacqueline van Gorkom, Chris P. Haines, Yara L. Jaffé, María Montero-Castaño, Bianca M. Poggianti, Marc A. W. Verheijen, Hyein Yoon, Boris Z. Deshev, Kevin HarringtonDavid H. Hughes, Glenn E. Morrison, F. Peter Schloerb, Miguel Velazquez

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Samenvatting

An understanding of the mass build-up in galaxies over time necessitates tracing the evolution of cold gas (molecular and atomic) in galaxies. To that end, we have conducted a pilot study called CO Observations with the LMT of the Blind Ultra-Deep H I Environment Survey (COOL BUDHIES). We have observed 23 galaxies in and around the two clusters Abell 2192 (z = 0.188) and Abell 963 (z = 0.206), where 12 are cluster members and 11 are slightly in the foreground or background, using about 28 total hours on the Redshift Search Receiver on the Large Millimeter Telescope (LMT) to measure the 12CO J = 1 → 0 emission line and obtain molecular gas masses. These new observations provide a unique opportunity to probe both the molecular and atomic components of galaxies as a function of environment beyond the local Universe. For our sample of 23 galaxies, nine have reliable detections (S/N ≥ 3.6) of the 12CO line, and another six have marginal detections (2.0 CO line, and another six have marginal detections (2.0 CO line, and another six have marginal detections (2.0 9 and 1010 M⊙. Comparing our results to other studies of molecular gas, we find that our sample is significantly more abundant in molecular gas overall, when compared to the stellar and the atomic gas component, and our median molecular gas fraction lies about 1σ above the upper limits of proposed redshift evolution in earlier studies. We discuss possible reasons for this discrepancy, with the most likely conclusion being target selection and Eddington bias.
Originele taal-2English
Pagina's (van-tot)3287-3306
Aantal pagina's20
TijdschriftMonthly Notices of the Royal Astronomical Society
Volume459
Nummer van het tijdschrift3
DOI's
StatusPublished - 9-mei-2016

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