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arXiv · 1312.4543

Fundamental Mass-Spin-Morphology Relation of Spiral Galaxies

Danail Obreschkow·Karl Glazebrook
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Abstract

This work present high-precision measurements of the specific baryon angular momentum jb, contained in stars, atomic gas, and molecular gas, out to ~10 scale radii, in 16 nearby spiral galaxies of the THINGS sample. The accuracy of these measurements improves on existing studies by an order of magnitude, leading to the discovery of a strong correlation between the baryon mass Mb, jb, and the bulge mass fraction B/T, fitted by B/T=-(0.34+-0.03)*log(jb/Mb/[1e-7 kpc km/s/Msun])-(0.04+-0.01) on the full sample range of B/T=0.00-0.32 and Mb/Msun=1e9-1e11. The corresponding relation for the stellar quantities Ms and js is identical within the uncertainties. These M-j-B/T relations likely originate from the proportionality between j/M and the surface density of the disk that dictates its stability against (pseudo-)bulge formation. Using a CDM model, we can approximately explain classical scaling relations, such as the fundamental plane of spiral galaxies, the Tully-Fisher relation, and the mass-size relation, in terms of the M-j-B/T relation. These results advocate the use of mass and angular momentum as the most fundamental quantities of spiral galaxies.

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Danail Obreschkow, Karl Glazebrook. 2014-02-06. Fundamental Mass-Spin-Morphology Relation of Spiral Galaxies. https://doi.org/10.1088/0004-637x%2F784%2F1%2F26

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