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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: [email protected]
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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.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 99
Copyright
Copyright © International Astronomical Union 2007

References

Gentile, G., Burkert, A., Salucci, P., Klein, U., & Walter, F. 2005, ApJ, 634, L145.CrossRefGoogle Scholar
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