Dynamical friction in globular cluster-rich ultra-diffuse galaxies: the case of NGC5846-UDG1
arXiv:2202.10179 · doi:10.3847/2041-8213/ac70df
Abstract
Ultra-diffuse galaxies that contain a large sample of globular clusters (GCs) offer an opportunity to test the predictions of galactic dynamics theory. NGC5846-UDG1 is an excellent example, with a high-quality sample of dozens of GC candidates. We show that the observed distribution of GCs in NGC5846-UDG1 is suggestive of mass segregation induced by gravitational dynamical friction. We present simple analytic calculations, backed by a series of numerical simulations, that naturally explain the observed present-day pattern of GC masses and radial positions. Subject to some assumptions on the GC population at birth, the analysis supports the possibility that NGC5846-UDG1 resides in a massive dark matter halo. This is an example for the use of GC-rich systems as dynamical (in addition to kinematical) tracers of dark matter.
12 pages, 6 figures + appendices. Some clarifications and additional robustness tests. Conclusions unchanged. Matches journal version
References in corpus (19)
- Ultralight scalars as cosmological dark matter
- Does the Fornax dwarf spheroidal have a central cusp or core?
- Galaxy Groups within 3500 km s
- Dynamical friction in constant density cores: a failure of the Chandrasekhar formula
- Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
- The Globular Cluster Migratory Origin of Nuclear Star Clusters
- NGC5846-UDG1: A galaxy formed mostly by star formation in massive, extremely dense clumps of gas
- A spectroscopic study of MATLAS-2019 with MUSE: an ultra-diffuse galaxy with an excess of old globular clusters
- Dwarf galaxies in the MATLAS survey: Hubble Space Telescope observations of the globular cluster system in the ultra-diffuse galaxy MATLAS-2019
- An Ultra diffuse Galaxy in the NGC 5846 group from the VEGAS survey
- A Complex Luminosity Function for the Anomalous Globular Clusters in NGC1052-DF2 and NGC1052-DF4
- Stellar Velocity Dispersion and Dynamical Mass of the Ultra-Diffuse Galaxy NGC 5846_UDG1 from the Keck Cosmic Web Imager
- On the Orbital Decay of Globular Clusters in NGC1052-DF2: Testing a Baryon-Only Mass Model
- Cusp or core? Revisiting the globular cluster timing problem in Fornax
- Dynamical Friction, Buoyancy and Core-Stalling -- I. A Non-perturbative Orbit-based Analysis
- Assessing the Fornax globular cluster timing problem in different models of dark matter
- The survival of globular clusters in a cuspy Fornax
- On the Evolution of the Globular Cluster System in NGC 1052-DF2: Dynamical Friction, Globular-Globular Interactions and Galactic Tides
- The spatial distribution of globular clusters in dwarf spheroidal galaxies and the timing problem