Einasto gravitational potentials have difficulty to hold spherically symmetric stellar systems with cores

Autor:	Almeida, Jorge Sanchez
Rok vydání:	2024
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
Popis:	It was known that an ideal spherically symmetric stellar system with isotropic velocities and an inner core cannot reside in a Navarro, Frenk, and White (NFW) gravitational potential. The incompatibility can be pinned down to the radial gradient of the NFW potential in the very center of the system, which differs from zero. The gradient is identically zero in an Einasto potential, also an alternative representation of the dark matter (DM) halos created by the kind of cold DM (CDM) defining the current cosmological model. Here we show that, despite the inner gradient being zero, stellar cores are also inconsistent with Einasto potentials. This result may have implications to constrain the nature of DM through interpreting the stellar cores often observed in dwarf galaxies. Comment: RNAAS complementing our previous paper Sanchez Almeida et al. (2023, ApJ, 954, 153; doi: 10.3847/1538-4357/ace534)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2406.13613 Zobrazit plný text záznamu View this record from Arxiv