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Rotation Curves of Dwarf Irregulars: Still a Big Challenge for ΛCDM

Published online by Cambridge University Press:  01 August 2006

Gianfranco Gentile
Gianfranco Gentile*
Affiliation:
Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87121, USA email: ggentile@unm.edu
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Abstract

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I present the analysis of HI data of two nearby dwarf irregular galaxies: DDO 47 and NGC 3741, whose rotation curves are best fitted by a cored halo, while they are inconsistent with an NFW halo. In DDO 47 non-circular motions are too small to explain the discrepancy with the ΛCDM predictions. NGC 3741 has the most extended rotation curve ever observed, in terms of the optical size.

References

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