| Issue |
A&A
Volume 629, September 2019
|
|
|---|---|---|
| Article Number | L5 | |
| Number of page(s) | 5 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/201936158 | |
| Published online | 28 August 2019 | |
Letter to the Editor
Imprint of the galactic acceleration scale on globular cluster systems
1
Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg (ObAS), UMR 7550, 67000 Strasbourg, France
e-mail: bilek@astro.unistra.fr
2
Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
3
Lund Observatory, Sölvegatan 27, Box 43, 221 00 Lund, Sweden
Received:
23
June
2019
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
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.