The role of active galactic nuclei in galaxy formation
P. A. Thomas, B. M. Henriques
TL;DR
This paper investigates how active galactic nuclei influence galaxy formation and demonstrates that tidal stripping can reduce the need for AGN feedback in models, while accurately reproducing galaxy metallicities and intracluster light.
Contribution
It introduces tidal stripping into galaxy formation models, reducing reliance on AGN feedback and improving agreement with observed galaxy properties.
Findings
Tidal stripping decreases the necessity of AGN feedback.
The model accurately reproduces galaxy metallicities.
The model matches observed intracluster light fractions.
Abstract
We use Monte-Carlo Markov chain techniques to constrain acceptable parameter regions for the Munich L-Galaxies semi-analytic galaxy formation model. Feedback from active galactic nuclei (AGN) is required to limit star-formation in the most massive galaxies. However, we show that the introduction of tidal stripping of dwarf galaxies as they fall into and merge with their host systems can lead to a reduction in the required degree of AGN feedback. In addition, the new model correctly reproduces both the metallicity of large galaxies and the fraction of intracluster light.
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