Volume 629, September 2019
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||28 August 2019|
Letter to the Editor
Imprint of the galactic acceleration scale on globular cluster systems
Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg (ObAS), UMR 7550, 67000 Strasbourg, France
2 Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
3 Lund Observatory, Sölvegatan 27, Box 43, 221 00 Lund, Sweden
Accepted: 8 August 2019
We report that the density profiles of globular cluster (GC) systems in a sample of 17 early-type galaxies (ETGs) show breaks at the radii where the gravitational acceleration exerted by the stars equals the galactic acceleration scale a0 known from the radial acceleration relation or the modified Newtonian dynamics (MOND). The match with the other characteristic radii in the galaxy is not that close. We propose possible explanations in the frameworks of the Lambda cold dark matter (ΛCDM) model and MOND. We find tentative evidence that in the ΛCDM context, GCs reveal not only the masses of the dark halos through the richness of the GC systems but also the concentrations through the break radii of the GC systems.
Key words: galaxies: structure / galaxies: elliptical and lenticular, cD / galaxies: halos / galaxies: formation / gravitation
© M. Bílek et al. 2019
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