HIghMass - High HI Mass, HI-Rich Galaxies at $z\sim 0$: Combined HI and H${}_2$ Observations

Abstract

We present resolved HI and CO observations of three galaxies from the HIghMass sample, a sample of HI-massive ($M_{HI}>10^{10}{M}_{\odot }$), gas-rich ($M_{HI}$ in top $5\%$ for their $M_{\ast }$) 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$/M_{\ast }$) 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 ($\lambda$) 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$\alpha$ observations.

20 pages, 13 figures

References in corpus (13)

• UV Star Formation Rates in the Local Universe
• Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• COLD GASS, an IRAM Legacy Survey of Molecular Gas in Massive Galaxies: II. The non-universality of the Molecular Gas Depletion Timescale
• The UV-Optical Color Magnitude Diagram II: Physical Properties and Morphological Evolution On and Off of a Star-Forming Sequence
• Accretion of gas onto nearby spiral galaxies
• HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
• Empirical distributions of galactic $\lambda$ spin parameters from the SDSS
• HIghMass -- High HI Mass, HI-rich Galaxies at z~0: Sample Definition, Optical and Halpha Imaging, and Star Formation Properties
• The role of spin in the formation and evolution of galaxies
• HIghMass - High HI Mass, HI-rich Galaxies at z~0: High-Resolution VLA Imaging of UGC 9037 and UGC 12506
• Resolved HI Imaging of a Population of Massive HI-Rich Galaxies with Suppressed Star Formation
• Molecular Gas Content of HI Monsters and Implications to Cold Gas Content Evolution in Galaxies

Cited by in corpus (5)

• The HIX galaxy survey I: Study of the most gas rich galaxies from HIPASS
• Probing gas and dust in the tidal tail of NGC 5221 with the type Ia supernova iPTF16abc
• Non-circular flows in HIghMass galaxies in a test of the late accretion hypothesis
• The H IX galaxy survey III: The gas-phase metallicity in HI eXtreme galaxies
• Galaxies with Abnormally High Gas Content in the Disk