Multiwavelength Rotation Curves to Test Dark Halo Central Shapes

2002/03/09 by Sebastien Blais-Ouellette, Sébastien Blais-Ouellette, Blais-Ouellette, Sebastien +6
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Radio Astronomy Observations and Technology #Scientific Research and Discoveries #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0203146

8 pages, 5 figures. Contribution to the proceedings of "Galaxies: the Third Dimension" held in Cozumel, Mexico, in December 2001

arxiv created 2002/03/09 · openalex publication_date 2002/03/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We use Fabry-Perot Halpha spectroscopy, complemented with published HI radio synthesis observations to derive high resolution rotation curves of spiral galaxies. We investigate precisely their inner mass distribution and compare it to CDM simulations predictions. Having verified the existence of the so-called core-cusp problem, we find that the dark halo density inner slope is related to the galaxy masses. Dwarf galaxies with V_max < 100 km/s have halo density inner slope 0 < γ< 0.7 while galaxies with V_max > 100 km/s are best fitted by γ>= 1.

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