TY - JOUR
T1 - New lessons from the H I size-mass relation of galaxies
AU - Wang, Jing
AU - Koribalski, Barbel S.
AU - Serra, Paolo
AU - van der Hulst, Thijs
AU - Roychowdhury, Sambit
AU - Kamphuis, Peter
AU - Chengalur, Jayaram N.
PY - 2016
Y1 - 2016
N2 - We revisit the H i size-mass 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 similar to 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.
AB - We revisit the H i size-mass 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 similar to 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.
UR - https://hdl.handle.net/1959.7/uws:63853
U2 - 10.1093/mnras/stw1099
DO - 10.1093/mnras/stw1099
M3 - Article
SN - 0035-8711
VL - 460
SP - 2143
EP - 2151
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -