Journal article

Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter

R Foot

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | IOP PUBLISHING LTD | Published : 2014

Abstract

If dark matter is dissipative then the distribution of dark matter within galactic halos can be governed by dissipation, heating and hydrostatic equilibrium. Previous work has shown that a specific model, in the framework of mirror dark matter, can explain several empirical galactic scaling relations. It is shown here that this dynamical halo model implies a quasi-isothermal dark matter density, ρ(r) ∼ ρ 02=(r2 + r02), where the core radius, r0, scales with disk scale length, rD, via r0/kpc ∼ 1:4 (rD/kpc). Additionally, the product ρ0r0 is roughly constant, i.e. independent of galaxy size (the constant is set by the parameters of the model). The derived dark matter density profile implies th..

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Funding Acknowledgements

The author would like to thank Filippo Mannucci for very helpful correspondence. This work was supported by the Australian Research Council.