A radially-resolved equilibrium model for a baryonic disk evolution

We construct a simple, (semi)-analytic model of radially-resolved gas plus star baryonic disk buildup within the framework of the "equilibrium-regulator" model for galaxy evolution. The dynamics is governed by mass-continuity and global angular momentum conservation, subject to equilibrium relations, that relate the star formation rate, gas mass flows in the disk, accretion from the IGM and/or hot halo, and stellar wind ejection outflows. Many observed features of real galaxies are produced in our model, including (quasi)-exponential disks, cosmologically variable gas fractions, and specific star-formation rates for main-sequence galaxies.

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