The relation between specific baryon angular momentum and mass for a sample of nearby low-mass galaxies with resolved HI kinematics

Abstract

This paper investigates the relationship between specific baryon angular momentum $j_{\mathrm{b}}$ and baryon mass $M_{\mathrm{b}}$ for a sample of nearby late-type galaxies with resolved HI kinematics. This work roughly doubles the number of galaxies with $M_{\mathrm{b}}\lesssim 10^{10}$ $M_{\odot }$ used to study the $j_{\mathrm{b}}-M_{\mathrm{b}}$ relation. Most of the galaxies in the sample have their baryon mass dominated by their gas content, thereby offering $j_{\mathrm{b}}$ and Mb measures that are relatively unaffected by uncertainties arising from the stellar mass-to-light ratio. Measured HI surface density radial profiles together with optical and rotation curve data from the literature are used to derive a best-fit relation given by $j_{\mathrm{b}}=q{M}_{\mathrm{b}}^{\alpha }$, with $\alpha =0.62\pm 0.02$ and ${\log }_{10}q=-3.35\pm 0.25$. This result is consistent with the $j_{\mathrm{b}}\propto M_{\mathrm{b}}^{2/3}$ relation that is theoretically expected and also measured by Obreschkow & Glazebrook (2014) for their full sample of THINGS spiral galaxies, yet differs to their steeper relation found for subsets with fixed bulge fraction. The 30 arcsec spatial resolution of the HI imaging used in this study is significantly lower than that of the THINGS imaging used by Obreschkow & Glazebrook (2014), yet the results presented in this work are clearly shown to contain no significant systematic errors due to the low-resolution imaging.

MNRAS, in press

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• A tight angular-momentum plane for disc galaxies
• Angular momentum of dwarf galaxies
• Angular momentum and local gravitational instability in galaxy discs: does $Q$ correlate with $j$ or $M$?
• The influence of angular momentum and environment on the HI gas of late-type galaxies
• The Dynamics and Distribution of Angular Momentum in HiZELS Star-Forming Galaxies at z = 0.8 - 3.3
• HI angular momentum mass relation
• Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with the Square Kilometre Array
• A serendipitous discovery of HI-rich galaxy groups with MeerKAT
• The $H_2$ angular momentum -- mass relation of local disc galaxies