A constant dark matter halo surface density in galaxies

2009/04/27 by F. Donato, G. Gentile, P. Salucci +6 · 401 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Dark Matter and Cosmic Phenomena #Dark matter #Dark matter halo #Disc #Dwarf galaxy #Dwarf galaxy problem #Elliptical galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Spiral galaxy #astro-ph.CO

paper · pdf · doi:10.1111/j.1365-2966.2009.15004.x

published in Monthly Notices of the Royal Astronomical Society 397(3), 1169-1176 (Oxford University Press) · Accepted for publication in MNRAS. 9 pages, 4 figures

arxiv created 2009/04/27 · openalex publication_date 2009/07/17 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We confirm and extend the recent finding that the central surface density μ0D≡r0ρ0 of galaxy dark matter haloes, where r0 and ρ0 are the halo core radius and central density, is nearly constant and independent of galaxy luminosity. Based on the co-added rotation curves (RCs) of ∼1000 spiral galaxies, the mass models of individual dwarf irregular and spiral galaxies of late and early types with high-quality RCs, and the galaxy–galaxy weak-lensing signals from a sample of spiral and elliptical galaxies, we find that log μ0D= 2.15 ± 0.2 in units of log(M⊙ pc−2). We also show that the observed kinematics of Local Group dwarf spheroidal galaxies are consistent with this value. Our results are obtained for galactic systems spanning over 14 mag, belonging to different Hubble types and whose mass profiles have been determined by several independent methods. In the same objects, the approximate constancy of μ0D is in sharp contrast to the systematical variations, by several orders of magnitude, of galaxy properties, including ρ0 and central stellar surface density.

Citations

• The Structure of Dark Matter Halos in Dwarf Galaxies

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