xGASS: The connection between angular momentum, mass and atomic gas fraction in nearby galaxies

Abstract

We use a sample of 559 disc galaxies extracted from the eXtended GALEX Arecibo SDSS Survey (xGASS) to study the connection between baryonic angular momentum, mass and atomic gas fraction in the local Universe. Baryonic angular momenta are determined by combining HI and H${}_2$ integrated profiles with two-dimensional stellar mass surface density profiles. In line with previous work, we confirm that specific angular momentum and atomic gas fraction are tightly correlated, but we find a larger scatter than previously observed. This is most likely due to the wider range of galaxy properties covered by our sample. We compare our findings with the predictions of the analytical stability model developed by Obreschkow et al. and find that, while the model provides a very good first-order approximation for the connection between baryonic angular momentum, mass and gas fraction, it does not fully match our data. Specifically, we find that at fixed baryonic mass, the dependence of specific angular momentum on gas fraction is significantly weaker, and at fixed gas fraction, the slope of the angular momentum vs. mass relation is shallower than what was predicted by the model. The reasons behind this tension remain unclear, but we speculate that multiple factors may simultaneously play a role, all related to the fact that the model is not able to encapsulate the full diversity of galaxy properties in our sample.

10 pages, 7 figures. Accepted for publication in MNRAS

References in corpus (16)

• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• xCOLD GASS: the complete IRAM-30m legacy survey of molecular gas for galaxy evolution studies
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• Dawes Review 4: Spiral Structures in Disc Galaxies
• Scaling Relations of Spiral Galaxies
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• Angular momentum evolution of galaxies in EAGLE
• xGASS: Gas-rich central galaxies in small groups and their connections to cosmic web gas feeding
• xGASS: Cold gas content and quenching in galaxies below the star forming main sequence
• A tight angular-momentum plane for disc galaxies
• xGASS: The Impact of Photometric Bulges on the Scatter of HI Scaling Relations
• Far-reaching Dust Distribution in Galaxy Disks
• The influence of angular momentum and environment on the HI gas of late-type galaxies
• WALLABY Pre-Pilot Survey: The effects of angular momentum and environment on the HI gas and star formation properties of galaxies in the Eridanus supergroup
• The Neutral Hydrogen Properties of Galaxies in Gas-rich Groups
• HI angular momentum mass relation