Mon. Not. R. Astron. Soc., 445, 3512-3524 (2014/December-3)
On the surface density of dark matter haloes.
SABUROVA A. and POPOLO A.DEL
Abstract (from CDS):
In this article, we test the conclusion of the universality of the dark matter (DM) halo surface density µ0D = ρ0r0. According to our study, the dispersion of values of µ0D is twice as high as that found previously by other authors. We conclude that the DM surface density and its Newtonian acceleration are not constant but correlate with the luminosity, morphological type, (B - V)0 colour index and content of neutral hydrogen. These DM parameters are higher for more luminous systems of early types with red colour and low gas content. We also found that the correlation of DM parameters with colour index appears to be the manifestation of a stronger relation between DM halo mass and the colour of a galaxy. This finding is in agreement with cosmological simulations. These results leave little room for the recently claimed universality of DM column density. We also found that isolated galaxies in our sample (contained in the Analysis of the interstellar Medium of Isolated GAlaxies (AMIGA) catalogue) do not differ significantly in their value of µ0D from the entire sample. Thus, since the AMIGA catalogue gives a sample of galaxies that have not interacted with a significant mass neighbour in the past 3Gyr, the difference between systems with low and high values of µ0D is not related to merging events during this period of time.