Abstract
We present a unified parametrization of the fitting functions suitable for the 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. Based on this, we also argue that there is basically no qualitative difference between halo models fitted well by the Einasto profile and the standard Navarro-Frenk-White model. This might even be the case quantitatively, unless the resolution of simulations and the precision of fittings are sufficiently high to make meaningful distinctions possible.
Original language | English |
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Pages (from-to) | 2805-2811 |
Number of pages | 7 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 428 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Jan 2013 |
Keywords
- Dark matter
- Methods: analytical