Lack of nuclear clusters in dwarf spheroidal galaxies: implications for massive black holes formation and the cusp/core problem
arXiv:1611.01088 · doi:10.1093/mnras/stw2483
Abstract
One of the leading scenarios for the formation of nuclear star clusters in galaxies is related to the orbital decay of globular clusters (GCs) and their subsequent merging, though alternative theories are currently debated. The availability of high-quality data for GCs structural and orbital parameters allow to test different nuclear star cluster formation scenarios. The Fornax dwarf spheroidal (dSph) galaxy is the heaviest satellite of the Milky Way and it is the only known dwarf spheroidal hosting 5 GCs, whereas there are no clear signatures for the presence of a central massive black hole. For this reason, it represents a suited place to study the orbital decay process in dwarf galaxies. In this paper we model the future evolution of the Fornax GCs simulating them and the host galaxy by means of direct -body simulations. Our simulations take in account also the gravitational field generated by the Milky Way. We found that if the Fornax galaxy is embedded in a standard Cold Dark Matter Halo, the nuclear cluster formation would be significantly hampered by the high central galactic mass density. In this context, we discuss the possibility that infalling GCs drive the flattening of the galactic density profile, giving a possible alternative explanation to the so-called cusp/core problem. Moreover, we briefly discuss the link between GC infall process and the absence of massive black holes in the centre of dSphs.
12 pages, 14 figures, 4 tables, in press in the MNRAS
References in corpus (17)
- The ACS Virgo Cluster Survey. VIII. The Nuclei of Early-Type Galaxies
- The Observed properties of Dark Matter on small spatial scales
- Does the Fornax dwarf spheroidal have a central cusp or core?
- Ejection of Supermassive Black Holes from Galaxy Cores
- Black holes and core expansion in massive star clusters
- Dynamical friction in constant density cores: a failure of the Chandrasekhar formula
- On the formation of dwarf galaxies and stellar halos
- Updated Mass Scaling Relations for Nuclear Star Clusters and a Comparison to Supermassive Black Holes
- The Globular Cluster Migratory Origin of Nuclear Star Clusters
- Early flattening of dark matter cusps in dwarf spheroidal galaxies
- The formation of ultra-compact dwarf galaxies and nucleated dwarf galaxies
- Merging of globular clusters within inner galactic regions. II. The Nuclear Star Cluster formation
- Henize 2-10: the ongoing formation of a nuclear star cluster around a massive black hole
- Formation and evolution of nuclear star clusters with in-situ star-formation: Nuclear cores and age segregation
- On the onset of runaway stellar collisions in dense star clusters I. Dynamics of the first collision
- Globular clusters as tracers of the host galaxy mass distribution: the Fornax dSph test case
- Models of mass segregation at the Galactic centre
Cited by in corpus (12)
- Testing Bose-Einstein Condensate dark matter models with the SPARC galactic rotation curves data
- Dynamical Friction, Buoyancy and Core-Stalling -- I. A Non-perturbative Orbit-based Analysis
- Probing the formation history of the nuclear star cluster at the Galactic Centre with millisecond pulsars
- The MEGaN project I. Missing formation of massive nuclear clusters and tidal disruption events by star clusters - massive black hole interactions
- Fornax globular cluster distributions: implications for the cusp-core problem
- Star formation at the Galactic Centre: coevolution of multiple young stellar discs
- Dynamical friction in Bose-Einstein condensed self-interacting dark matter at finite temperatures, and the Fornax dwarf spheroidal
- Tidal disruption of stellar clusters and their remnants' spatial distribution near the galactic center
- Astrophysics with the Laser Interferometer Space Antenna
- Emergence of a stellar cusp by a dark matter cusp in a low-mass compact ultra-faint dwarf galaxy
- Nuclear star clusters as probes of dark matter halos: the case of the Sagittarius Dwarf Spheroidal Galaxy
- Distinguishing Dark Matter Cusps from Cores using Globular Clusters