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http://hdl.handle.net/20.500.12386/30800
Title: | New lessons from the H I size-mass relation of galaxies | Authors: | Wang, Jing Koribalski, Bärbel S. SERRA, PAOLO van der Hulst, Thijs Roychowdhury, Sambit Kamphuis, Peter Chengalur, Jayaram N. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 460 | Issue: | 2 | First Page: | 2143 | Abstract: | We revisit the H I size-mass (D_{H I}-M<SUB>H I</SUB>) 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 σ ∼ 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<SUB>H I</SUB>. 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<SUB>H I</SUB>-M<SUB>H I</SUB> relation. This simple relation puts strong constraints on simulation models for galaxy formation. | URI: | http://hdl.handle.net/20.500.12386/30800 | URL: | https://academic.oup.com/mnras/article/460/2/2143/2609089 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1099 | Bibcode ADS: | 2016MNRAS.460.2143W | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stw1099.pdf | Pdf editoriale | 1.63 MB | Adobe PDF | View/Open |
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