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TwitterA&A 409, 53-56 (2003)
DOI: 10.1051/0004-6361:20030646
CDM and the distribution of dark matter in galaxies:
A constant-density halo around DDO 47
P. Salucci1, F. Walter2 and A. Borriello1
1 International School for Advanced Studies SISSA/ISAS, Trieste, Italy
e-mail: borri@sissa.it
2 California Institute of Technology, Pasadena, CA 91125, USA
e-mail: fw@astro.caltech.edu
(Received 3 September 2002 / Accepted 10 April 2003)
Abstract
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
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.
Key words: cosmology: dark mater -- galaxies: spiral -- galaxies: formation
Offprint request: P. Salucci, salucci@sissa.it
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