Journal
ASTRONOMY & ASTROPHYSICS
Volume 409, Issue 1, Pages 53-56Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20030646
Keywords
cosmology : dark mater; galaxies : spiral; galaxies : formation
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In this paper we present a test case for the existence of a core in the density distribution of dark halos around galaxies. DDO 47 has a rotation curve that increases linearly from the first data point, at 300 pc, up to the last one, at 5 kpc. This profile implies the presence of a (dark) halo with an (approximately) constant density over the region mapped by data. This evidences the inability of standard Lambda Cold Dark Matter scenario to account for the dark matter distribution around galaxies, and points toward the existence of an intriguing halo scale-length of homogeneity. This work adds up to the results of Blais-Ouellette et al. (2002), Trott & Webster (2002), Binney & Evans (2002), de Blok & Bosma (2002) and Bottema (2002) in suggesting that at galactic scales CDM theory should incorporate, as an intrinsic property, a density core feature.
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