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Fitting functions for dark matter density profiles

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arxiv 1209.6220 v1 pith:VO2TGN3F submitted 2012-09-27 astro-ph.CO

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keywords profilescasedarkdensityeinastofittingfunctionsmatter
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We present a unified parameterization of the fitting functions suitable for density profiles of dark matter haloes or elliptical galaxies. A notable feature is that the classical Einasto profile appears naturally as the continuous limiting case of the cored subfamily amongst the double power-law profiles of Zhao (1996). Based on this, we also argue that there is basically no qualitative difference between halo models well-fitted by the Einasto profile and the standard NFW model. This may even be the case quantitatively unless the resolutions of simulations and the precisions of fittings are sufficiently high to make meaningful distinction possible.

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    astro-ph.CO 2026-02 conditional novelty 5.0 of 10

    A Bayesian Jeans analysis of three ultra-diffuse galaxies finds no preference for a non-minimal dark-matter-gravity coupling and yields weak upper limits on its length scale.

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