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The dark matter distribution in dwarf galaxies: a contribution to the cusp-core discussion

The dark matter distribution in dwarf galaxies: a contribution to the cusp-core discussion. Ralf-Jürgen Dettmar Ruhr-University Bochum. Collaborators: Janine van Eymeren (AIRUB, UManchester) Clemens Trachternach (AIRUB) Dominik Bomans (AIRUB) Baerbel Koribalski (ATNF/CSIRO, AUS).

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The dark matter distribution in dwarf galaxies: a contribution to the cusp-core discussion

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  1. The dark matter distribution in dwarf galaxies:a contribution to the cusp-core discussion Ralf-Jürgen Dettmar Ruhr-University Bochum R.-J. Dettmar: Dark matter in dwarfs

  2. Collaborators: Janine van Eymeren (AIRUB, UManchester) Clemens Trachternach (AIRUB) Dominik Bomans (AIRUB) Baerbel Koribalski (ATNF/CSIRO, AUS) R.-J. Dettmar: Dark matter in dwarfs

  3. disk-halo connection with outflows or winds? R.-J. Dettmar: Dark matter in dwarfs

  4. gaseous galactic halos of diffuse ionized gas (DIG) are easily observable in Ha NGC4700 (Rossa&Dettmar 2001) R.-J. Dettmar: Dark matter in dwarfs

  5. NGC4700 HST/ACS (Rossa, Dahlem, Dettmar, van der Marel) HST/ACS Rossa et al. (in prep) R.-J. Dettmar: Dark matter in dwarfs

  6. NGC2366 NGC4861 SDSS (DAH/Lowell) R.-J. Dettmar: Dark matter in dwarfs

  7. Calar Alto 2.2m R.-J. Dettmar: Dark matter in dwarfs

  8. Compare H_alpha velocity field with HI H_alpha data obtained with Marseille Fabry-Perot at OHP VLA Data were archival (new array combination, N2366) or taken as part of THINGS (N4861, Walter et al. 2008) R.-J. Dettmar: Dark matter in dwarfs

  9. R.-J. Dettmar: Dark matter in dwarfs

  10. R.-J. Dettmar: Dark matter in dwarfs

  11. R.-J. Dettmar: Dark matter in dwarfs

  12. R.-J. Dettmar: Dark matter in dwarfs

  13. NFW Profile isothermal R.-J. Dettmar: Dark matter in dwarfs

  14. Harmonic analysis of HI velocity fields typically N=3 is sufficient R.-J. Dettmar: Dark matter in dwarfs

  15. NGC3198 from THINGS R.-J. Dettmar: Dark matter in dwarfs

  16. Analysis of the THINGS sample (Trachternach et al. 2008) R.-J. Dettmar: Dark matter in dwarfs

  17. Some general properties of the sample R.-J. Dettmar: Dark matter in dwarfs

  18. Observational parameters R.-J. Dettmar: Dark matter in dwarfs

  19. example: NGC4861 R.-J. Dettmar: Dark matter in dwarfs

  20. de Blok 2003 R.-J. Dettmar: Dark matter in dwarfs

  21. mass modeling R.-J. Dettmar: Dark matter in dwarfs

  22. “cusp” “core” R.-J. Dettmar: Dark matter in dwarfs

  23. Slope of the dark matter profile Data from de Blok (2001) De Blok & Bosma (2002) Swaters et al. (2003) our data black squares R.-J. Dettmar: Dark matter in dwarfs

  24. Conclusions The ionized gas does not reach escape velocity in the giant HII regions of N2366 and N4861 In our sample of dwarfs non-circular motions contribute an amplitude < 6km/s or even <3 km/s in the inner 3kpc The rotation curves are generally better described by isothermal DM halos than by NFW profiles R.-J. Dettmar: Dark matter in dwarfs

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