Imprint of the galactic acceleration scale on globular cluster systems

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Abstract

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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Strasbourg
  • Astronomical Observatory Belgrade (AOB)
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
ArtikelnummerL5
TidskriftAstronomy and Astrophysics
Volym629
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa