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Date and Time of the Query: 2019-06-17 T17:09:34 PDT
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For refcode 2014ApJ...784...26O:
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Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...784...26O Fundamental Mass-Spin-Morphology Relation Of Spiral Galaxies Obreschkow, D.; Glazebrook, K. Abstract. This work presents high-precision measurements of the specific baryon angular momentum j_b_ 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 M_b_, j_b_, and the bulge mass fraction beta, fitted by {beta} =-(0.34+/- 0.03)\,lg\,(j_bM_b^{-1}/[10^{-7}\, kpc\,km\,s^{-1}\,{M}_{sun}_^{-1}])-(0.04+/- 0.01) on the full sample range of 0 <= beta <~ 0.3 and 10^9^ M_sun_ < M_b_ < 10^11^ M_sun_. The corresponding relation for the stellar quantities M_*_ and j_*_ is identical within the uncertainties. These M-j-beta relations likely originate from the proportionality between jM ^-1^ and the surface density of the disk that dictates its stability against (pseudo-)bulge formation. Using a cold dark matter 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(-beta) relation. These results advocate the use of mass and angular momentum as the most fundamental quantities of spiral galaxies. Key words: galaxies: bulges, galaxies: fundamental parameters, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure, radio lines: ISM
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