Gianluca Castignani, Noemi Frusciante, Daniele Vernieri, Paolo Salucci
In spiral galaxies, we explain their non-Keplerian rotation curves (RCs) by
means of a non-luminous component embedding the stellar-gaseous disks.
Understanding the detailed properties of this component (labelled Dark Matter,
DM) is one of the most pressing issues of Cosmology. We investigate the recent
relationship (claimed by Walker et al. 2010) between $r $, the galaxy radial
coordinate, and the dark halo contribution to the circular velocity at $r$,
{\it a}) in the framework of the Universal Rotation Curve (URC) paradigm and
directly {\it b}) by means of the kinematics of a large sample of Dark matter
dominated spirals. We find a general agreement between the W+10 claim, the
distribution of DM emerging from URC and that inferred in the (low luminosity)
objects. We show that the emerging phenomenology, linking the spiral's
luminosity, radii and circular velocities, implies an evident inconsistency
with (naive) predictions in the $\Lambda$CDM scenario.
View original:
http://arxiv.org/abs/1201.3998
No comments:
Post a Comment