20-24 March 2023
Haus H, Telegrafenberg
Europe/Berlin timezone

On the baryon-driven contraction of dark matter halos

24 Mar 2023, 09:40
Haus H, Telegrafenberg

Haus H, Telegrafenberg

Potsdam, Germany
Contributed talk SESSION 5 : Near-field cosmology and galaxy masses beyond the Local Group SESSION 5 : Near-field cosmology and galaxy masses beyond the Local Group


Pengfei Li (Leibniz-Institute for Astrophysics at Potsdam)


The gravitational interaction between dark matter (DM) and baryons has long been ignored when building galaxies semi-empirically and observationally. In this talk, I will show that the baryonic gravity leads to an adiabatic contraction of DM halos, ignoring which would result in the built galaxies that are not in a dynamic equilibrium and hence cannot exist in reality. We propose a new approach to fitting galaxy rotation curves by numerically calculating the contraction of DM halos. We find adiabatic contraction makes DM halos more cuspy for massive galaxies, so that their rotation curves cannot be fit without systematically reducing baryonic contributions. We also examine the baryonic effect on the predicted radial acceleration relation of cold DM model, and find the predicted relations of massive galaxies are systematically higher than observed. Both tensions point to a core-cusp problem, a classical problem for dwarf galaxies but persisting in massive galaxies as well due to strong adiabatic contraction. In order to reconcile this problem, feedback must work in massive galaxies as efficiently as in dwarf galaxies.

Do you plan to attend the symposium in-person or virtually? in-person

Primary authors

Pengfei Li (Leibniz-Institute for Astrophysics at Potsdam) Prof. Stacy McGaugh (Case Western Reserve University) Federico Lelli Prof. James Schombert (University of Oregon) Marcel Pawlowski (AIP) Dr Yong Tian (National Central University) Prof. Chung-Ming Ko ( National Central University)

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