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

doi:10.1088/1475-7516/2014/12/047

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

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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{sub 0}r{sub 0}{sup 2}/(r{sup 2}+r{sub 0}{sup 2}), where the core radius, r{sub 0}, scales with disk scale length, r{sub D}, via r{sub 0}/kpc ≈ 1.4(r{sub D}/kpc). Additionally, the product ρ{sub 0}r{sub 0} 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 that the galactic rotation velocity satisfies the Tully-Fisher relation, L{sub B}∝v{sup 3}{sub max}, where v{sub max} is the maximal rotational velocity. Examples of rotation curves resulting from this dynamics are given.

Authors:

Foot, R., E-mail: rfoot@unimelb.edu.au ^[1]

ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Victoria 3010 Australia (Australia)

Publication Date:: Mon Dec 01 00:00:00 EST 2014

OSTI Identifier:: 22382055

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2014; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; DIAGRAMS; DISTRIBUTION; EQUILIBRIUM; GALAXIES; LENGTH; MIRRORS; NONLUMINOUS MATTER; ROTATION; VELOCITY

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                    Foot, R., E-mail: rfoot@unimelb.edu.au. Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter.  United States: N. p., 2014. 
        Web.  doi:10.1088/1475-7516/2014/12/047.

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                    Foot, R., E-mail: rfoot@unimelb.edu.au. Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter.  United States.  https://doi.org/10.1088/1475-7516/2014/12/047

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                    Foot, R., E-mail: rfoot@unimelb.edu.au. 2014.  
        "Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter".  United States.  https://doi.org/10.1088/1475-7516/2014/12/047.

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@article{osti_22382055,

  title        = {Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter},

  author       = {Foot, R., E-mail: rfoot@unimelb.edu.au},

  abstractNote = {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{sub 0}r{sub 0}{sup 2}/(r{sup 2}+r{sub 0}{sup 2}), where the core radius, r{sub 0}, scales with disk scale length, r{sub D}, via r{sub 0}/kpc ≈ 1.4(r{sub D}/kpc). Additionally, the product ρ{sub 0}r{sub 0} 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 that the galactic rotation velocity satisfies the Tully-Fisher relation, L{sub B}∝v{sup 3}{sub max}, where v{sub max} is the maximal rotational velocity. Examples of rotation curves resulting from this dynamics are given.},

  doi          = {10.1088/1475-7516/2014/12/047},

  url          = {https://www.osti.gov/biblio/22382055},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 12,

  volume       = 2014,

  place        = {United States},

  year         = {Mon Dec 01 00:00:00 EST 2014},

  month        = {Mon Dec 01 00:00:00 EST 2014}

}

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