HIghMass - High HI Mass, HI-Rich Galaxies at $z\sim0$: Combined HI and H$_2$ Observations

Gregory Hallenbeck; Shan Huang; Kristine Spekkens; Martha P. Haynes; Riccardo Giovanelli; Elizabeth A. K. Adams; Jarle Brinchmann; John Carpenter; Jayaram Chengalur; Leslie K. Hunt; Karen L. Masters; Amélie Saintonge

doi:10.3847/1538-3881/152/6/225

paper

HIghMass - High HI Mass, HI-Rich Galaxies at $z \sim 0$ : Combined HI and H $_{2}$ Observations

arXiv:1610.03859 · doi:10.3847/1538-3881/152/6/225

Abstract

We present resolved HI and CO observations of three galaxies from the HIghMass sample, a sample of HI-massive ( $M_{H I} > 1 0^{10} M_{⊙}$ ), gas-rich ( $M_{H I}$ in top $5%$ for their $M_{*}$ ) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low surface brightness galaxies, and have typical specific star formation rates (SFR $/ M_{*}$ ) for their stellar masses. The three galaxies have normal star formation rates for their HI masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of HI to H $_{2}$ , not in converting H $_{2}$ to stars. In addition, their dark matter spin parameters ( $λ$ ) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but are now becoming active, in agreement with prior H $α$ observations.

arXiv comment20 pages, 13 figures

HIghMass - High HI Mass, HI-Rich Galaxies at $z \sim 0$ : Combined HI and H $_{2}$ Observations

Abstract

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HIghMass - High HI Mass, HI-Rich Galaxies at z∼0: Combined HI and H2​ Observations

Abstract

References in corpus (55)

Cited by in corpus (10)

HIghMass - High HI Mass, HI-Rich Galaxies at $z \sim 0$ : Combined HI and H $_{2}$ Observations