Molecular gas content of HI monsters and implications to cold gas content evolution in galaxies

Cheoljong Lee, Aeree Chung, Min S. Yun, Ryan Cybulski, G. Narayanan, N. Erickson

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13 Citations (Scopus)


We present 12CO (J=1→0) observations of a sample of local galaxies (0.04<z<0.08) with a large neutral hydrogen reservoir, or 'H I monsters'. The data were obtained using the redshift search receiver on the five college radio astronomy observatory (FCRAO) 14 m telescope. The sample consists of 20 HI-massive galaxies with MHI > 3 × 1010M from the Arecibo Legacy Fast ALFA (ALFALFA) survey and 8 low surface brightness galaxies (LSBs) witha comparable MHI(>1.5 × 1010M⊙). Our sample selection is purely based on the amount of neutral hydrogen, thereby providing a chance to study how atomic and molecular gas relate to each other in these HI-massive systems. We have detected CO in 15 out of 20 ALFALFA selected galaxies and 4 out of 8 LSBs with molecular gas mass MH2 of (1-11)× 109M. Their total cold gas masses of (2-7) × 1010M make them some of the most gas-massive galaxies identified to date in the Local Universe. Observed trends associated with HI, H2, and stellar properties of the HI massive galaxies and the field comparison sample are analysed in the context of theoretical models of galaxy cold gas content and evolution, and the importance of total gas content and improved recipes for handling spatially differentiated behaviours of disc and halo gas are identified as potential areas of improvement for the modelling.

Original languageEnglish
Pages (from-to)1363-1379
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 2014 Jun

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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