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Fundamental mass-spin-morphology relation of spiral galaxies

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posted on 2024-07-26, 13:59 authored by D. Obreschkow, Karl GlazebrookKarl Glazebrook
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 β, fitted by beta =-(0.34+/- 0.03),lg,(j_bM_b^{-1}/[10^{-7}, kpc,km,s^{-1},{M}_{odot }^{-1}])-(0.04+/- 0.01) on the full sample range of 0 <= β <~ 0.3 and 109 M ⊙ < M b < 1011 M ⊙. The corresponding relation for the stellar quantities M * and j * is identical within the uncertainties. These M-j-β 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(-β) relation. These results advocate the use of mass and angular momentum as the most fundamental quantities of spiral galaxies.

Funding

National Aeronautics and Space Administration

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ISSN

1538-4357

Journal title

Astrophysical Journal

Volume

784

Issue

1

Article number

article no. 26

Pagination

17 pp

Publisher

Institute of Physics

Copyright statement

Copyright © 2014 The American Astronomical Society.

Language

eng

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