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Fig. 1.

image

Mass profiles and RAR of BAHAMAS galaxies. Upper panel: cumulative mass profiles of stars (red dotted line) and total baryons (blue solid line) for BAHAMAS galaxies with . The star marker indicates the stellar mass within a aperture, indicative of what is typically regarded as the stellar mass of a galaxy. The blue dash-dotted line shows the typical baryonic mass profile of observed galaxies of similar mass, estimated based on an extrapolation of the compilation in Fig. 7 of Tumlinson et al. (2017). In the inner galaxy the discrepancy (light blue shaded region) between the observed and simulated Mbar is relatively small, but in the outer galaxy the majority of the baryons predicted to be present in BAHAMAS consist of currently unobserved, missing baryons. The orange dashed line shows the expected baryonic mass profile if the baryon density is everywhere equal to a fixed fraction fb = Ωbm of the local DM density. At large enough radii (), the baryon-to-DM ratio converges to the cosmic average. Lower panel: as in upper panel, but in acceleration space. The cosmic baryon fraction provides a strong theoretical upper limit on gbar at low accelerations in the context of the ΛCDM cosmology.

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