PROBING KING AND PLUMMER DARK MATTER MODELS USING ROTATION CURVES
DOI:
https://doi.org/10.31489/2026N2/139-147Keywords:
dark matter, spiral galaxies, rotation curves, King profile, Plummer profileAbstract
In this work, we study the distribution of dark matter in the halos of the spiral galaxies ESO3050090, ESO4880049, and ESO0140040 using their observed rotation curves. The analysis adopts spherically symmetric dark matter halos described by the King and Plummer density profiles, neglecting the baryonic component to emphasize the influence of the halo component only. As a first step, the characteristic halo parameters, the central density and the scale radius, are determined through a nonlinear least-squares fitting procedure based on the Levenberg–Marquardt algorithm. These best-fit values are then used as initial conditions for the Markov Chain Monte Carlo method to estimate the parameter space and uncertainties. Subsequently, we compare the results obtained from two specified fitting methods to assess their consistency and robustness. A statistical comparison between the King and Plummer profiles is performed using the Bayesian Information Criterion. The results of this work clarify how effectively the halo models under consideration reproduce the observed kinematics and highlight the ability to distinguish alternative dark matter density profiles.
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