Computer Science
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004bdmh.confe..42g&link_type=abstract
"Proceedings of "Baryons in Dark Matter Halos". Novigrad, Croatia, 5-9 Oct 2004. Editors: R. Dettmar, U. Klein, P. Salucci. Publ
Computer Science
Scientific paper
We present the HI data for 5 spiral galaxies that, along with their Hα rotation curves, are used in Gentile et al. (2004, MNRAS, 351, 903) to derive the distribution of dark matter within these objects. The HI rotation curves obtained are derived by constructing model data cubes that are iteratively compared to the observed ones. The HI rotation curves agree well with the Hα data, where they coexist. Moreover, the combined Hα + HI rotation curves are smooth, symmetric and extended to large radii. The rotation curves are decomposed into stellar, gaseous and dark matter contributions and the inferred density distribution is compared to various mass distributions: dark haloes with a central density core, Λ Cold Dark Matter (ΛCDM) haloes (NFW, Moore profiles), HI scaling and MOND. The observations point to haloes with constant density cores of size r core ˜ ro pt . ΛCDM models are in clear conflict with the data. HI scaling and MOND cannot account for the observed kinematics: we find some counter-examples. We also present some projects aimed at making steps forward in unveiling the properties of dark matter, in particular its outer density distribution.
Gentile Gianfranco
Klein Uli
Salucci Paolo
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