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Astrophysics of Galaxies (astro-ph.GA)

Thu, 06 Jul 2023

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1.Exploring the Angular Momentum - Atomic Gas Content Connection with EAGLE and IllustrisTNG

Authors:Jennifer A. Hardwick, Luca Cortese, Danail Obreschkow, Claudia Lagos, Adam R. H. Stevens, Barbara Catinella, Lilian Garrett-Smithson

Abstract: We use the EAGLE (Evolution and Assembly of GaLaxies and their Environments) and IllustrisTNG (The Next Generation) cosmological simulations to investigate the properties of the baryonic specific angular momentum (j), baryonic mass (M) and atomic gas fraction ($f_{\rm{atm}}$) plane for nearby galaxies. We find an excellent agreement between EAGLE and TNG, with both also matching quite well the results obtained with xGASS (eXtended GALEX Arecibo SDSS Survey) for gas fractions greater than 0.01. This implies that the disagreements previously identified between xGASS and predictions from simple analytical disc stability arguments also holds true for EAGLE and TNG. For lower gas fraction (the regime currently unconstrained by observations), both simulations deviate from the plane but still maintain good agreement with each other. Despite the challenges posed by resolution limits at low gas fractions, our findings suggest a potential disconnect between angular momentum and gas fraction in the gas-poor regime, implying that not all gas-poor galaxies have low specific angular momentum.