The influence of angular momentum and environment on the HI gas of late-type galaxies

Abstract

We use high-resolution HI data from the WHISP survey to study the HI and angular momentum properties of a sample of 114 late-type galaxies. We explore the specific baryonic angular momentum -- baryonic mass ($j_b-M_b$) relation, and find that an unbroken power law of the form $j_b\propto M_b^{0.55\pm 0.02}$ fits the data well, with an intrinsic scatter of $\sim 0.13\pm 0.01$ dex. We revisit the relation between the atomic gas fraction, $f_{atm}$, and the integrated atomic stability parameter $q$ (the $f_{atm}-q$ relation), originally introduced by Obreschkow et al., and probe this parameter space by populating it with galaxies from different environments, in order to study the influence of the environment on their $j_b$, $f_{atm}$ and $q$ values. We find evidence that galaxies with close neighbours show a larger intrinsic scatter about the $f_{atm}-q$ relation compared to galaxies without close-neighbours. We also find enhanced SFR among the deviating galaxies with close neighbours. In addition, we use the bulge-to-total (B/T) ratio as a morphology proxy, and find a general trend of decreasing B/T values with increasing disc stability and HI fraction in the $f_{atm}-q$ plane, indicating a fundamental link between mass, specific angular momentum, gas fraction and morphology of galaxies.

15 pages, 11 figures, accepted for publication in mnras

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Cited by in corpus (17)

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• The MUSE Hubble Ultra Deep Field Survey XVI. The angular momentum of low-mass star-forming galaxies. A cautionary tale and insights from TNG50
• xGASS: The connection between angular momentum, mass and atomic gas fraction in nearby 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
• HI angular momentum mass relation
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• The HI in Ring Galaxies Survey (HI-RINGS) -- Effects of the bar on the HI gas in ring galaxies
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• The $H_2$ angular momentum -- mass relation of local disc galaxies
• Modification of Newtonian Gravity: Implications for Hot Gas in Clusters and Galactic Angular Momentum