NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T11:48:49 PDT
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For refcode 2016MNRAS.460.2143W:
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Copyright by Royal Astronomical Society. 2016MNRAS.460.2143W New lessons from the H I size-mass relation of galaxies Wang, Jing; Koribalski, Barbel S.; Serra, Paolo; van der Hulst, Thijs; Roychowdhury, Sambit; Kamphuis, Peter; Chengalur, Jayaram N. Abstract. We revisit the H I size-mass (D_{H I}_-M_H I_) relation of galaxies with a sample of more than 500 nearby galaxies covering over five orders of magnitude in H I mass and more than 10 B-band magnitudes. The relation is remarkably tight with a scatter sigma ~ 0.06 dex, or 14 per cent. The scatter does not change as a function of galaxy luminosity, H I richness or morphological type. The relation is linked to the fact that dwarf and spiral galaxies have a homogeneous radial profile of H I surface density in the outer regions when the radius is normalized by D_H I_. The early-type disc galaxies typically have shallower H I radial profiles, indicating a different gas accretion history. We argue that the process of atomic-to-molecular gas conversion or star formation cannot explain the tightness of the D_H I_-M_H I_ relation. This simple relation puts strong constraints on simulation models for galaxy formation. Key words: Galaxy: formation, galaxies: ISM
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