Testing phenomenological and theoretical models of dark matter density profiles with galaxy clusters
Abstract
We use the stacked gravitational lensing mass profile of four high-mass (M >~10^{15}Msun) galaxy clusters around z ~ 0.3 from Umetsu et al. to fit density profiles of phenomenological [Navarro-Frenk-White (NFW), Einasto, S\'ersic, Stadel, Baltz-Marshall-Oguri (BMO) and Hernquist] and theoretical (non-singular Isothermal Sphere, DARKexp and Kang & He) models of the dark matter distribution. We account for large-scale structure effects, including a 2-halo term in the analysis. We find that the BMO model provides the best fit to the data as measured by the reduced chi^2. It is followed by the Stadel profile, the generalized NFW profile with a free inner slope and by the Einasto profile. The NFW model provides the best fit if we neglect the 2-halo term, in agreement with results from Umetsu et al. Among the theoretical profiles, the DARKexp model with a single form parameter has the best performance, very close to that of the BMO profile. This may indicate a connection between this theoretical model and the phenomenology of dark matter halos, shedding light on the dynamical basis of empirical profiles which emerge from numerical simulations.
Keywords
Cite
@article{arxiv.1301.1684,
title = {Testing phenomenological and theoretical models of dark matter density profiles with galaxy clusters},
author = {Leandro J. Beraldo e Silva and Marcos Lima and Laerte Sodré},
journal= {arXiv preprint arXiv:1301.1684},
year = {2013}
}
Comments
9 pages, 6 figures, 4 tables. Submitted to MNRAS Published in MNRAS - Correction of typos and inclusion of description of data