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High-Resolution Rotation Curves and Galaxy Mass Models from THINGS

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arxiv 0810.2100 v2 pith:GKBR6WMK submitted 2008-10-13 astro-ph

W.J.G. de Blok (1) , F. Walter (2) , E. Brinks (3) , C. Trachternach (4) , S-H. Oh (5) , R.C. Kennicutt Jr. (6) ((1) University of Cape Town; (2) MPIfA , Heidelberg; (3) University of Hertfordshire; (4) Ruhr-University Bochum; (5) RSAA , Mt Stromlo; (6) University of Cambridge) This is my paper · ORCID
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We present rotation curves of 19 galaxies from THINGS, The HI Nearby Galaxy Survey. The high spatial and velocity resolution of THINGS make these the highest quality HI rotation curves available to date for a large sample of nearby galaxies, spanning a wide range of HI masses and luminosities. The high quality of the data allows us to derive the geometrical and dynamical parameters using HI data alone. We do not find any declining rotation curves unambiguously associated with a cut-off in the mass distribution out to the last measured point. The rotation curves are combined with 3.6 um data from SINGS (Spitzer Infrared Nearby Galaxies Survey) to construct mass models. Our best-fit, dynamical disk masses, derived from the rotation curves, are in good agreement with photometric disk masses derived from the 3.6 um images in combination with stellar population synthesis arguments and two different assumptions for the stellar Initial Mass Function (IMF). We test the Cold Dark Matter-motivated cusp model, and the observationally motivated central density core model and find that (independent of IMF) for massive, disk-dominated galaxies, all halo models fit apparently equally well; for low-mass galaxies, however, a core-dominated halo is clearly preferred over a cuspy halo. The empirically derived densities of the dark matter halos of the late-type galaxies in our sample are half of what is predicted by CDM simulations, again independent of the assumed IMF.

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Cited by 8 Pith papers

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    In a new SIDM simulation of isolated dwarf halos, nine low-mass halos are core-collapsed, and inner density slope—rather than central density—best tracks collapse onset and matches analytic collapse-time predictions.

  3. Structure-wide dark matter density depletion induced by local degeneracies

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    Degeneracy-induced depletion from fermionic DM in subhalos creates structure-wide low-density cores consistent with observations, linking profile diversity to formation history.

  4. The nature of Cloud-9: a compact core embedded in a diffuse envelope

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  5. MSA-3D: Rotation Curves and Dark Matter Fractions at z~0.5-1.7 with JWST/NIRSpec

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    New JWST data on 23 galaxies at 0.5<z<1.7 show median dark matter fraction of 0.63 at effective radius with 0.2 dex scatter, and a mix of rising, flat, and falling rotation curves.

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