Accretion-regulated star formation in late-type galaxies
Jan Pflamm-Altenburg, Gerhard Hensler
TL;DR
This paper presents a four-phase galaxy evolution model demonstrating how extragalactic gas accretion regulates star formation rates, replacing self-regulation in isolated galaxies and establishing an equilibrium driven by accretion on billion-year timescales.
Contribution
It introduces an accretion-regulated star formation mode and quantifies how gas inflow controls galaxy star formation over cosmic timescales.
Findings
Star formation rate reaches equilibrium set by gas accretion.
Accretion dominates over internal regulation in galaxy evolution.
Model predicts long-term stability of star formation driven by external gas inflow.
Abstract
We develop a four-phase galaxy evolution model in order to study the effect of accretion of extra-galactic gas on the star formation rate (SFR) of a galaxy. Pure self-regulated star formation of isolated galaxies is replaced by an accretion-regulated star formation mode. The SFR settles into an equlibrium determined entirely by the gas accretion rate on a Gyr time scale.
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Stellar, planetary, and galactic studies