other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2012MNRAS.419..184A - Mon. Not. R. Astron. Soc., 419, 184-196 (2012/January-1)
Dark matter cores and cusps: the case of multiple stellar populations in dwarf spheroidals.
AMORISCO N.C. and EVANS N.W.
Abstract (from CDS):
Specializing to the case of the Sculptor dSph, we develop a technique to fit simultaneously both populations with Michie-King DFs. This enables us to determine the mass profile of the Sculptor dSph with unprecedented accuracy in the radial range 0.2 < r < 1.2 kpc. We show that cored halo models are preferred over cusped halo models, with a likelihood ratio test rejecting NFW models at any significance level higher than 0.05 per cent. Even more worryingly, the best-fitting NFW models require concentrations with c ≲ 20, which is not in the cosmologically preferred range for dwarf galaxies. We conclude that the kinematics of multiple populations in dSphs provides a substantial new challenge for theories of galaxy formation, with the weight of available evidence strongly against dark matter cusps at the centre.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: dwarf - galaxies: individual: Sculptor dSph - galaxies: kinematics and dynamics - Local Group - dark matter
Simbad objects: 9
To bookmark this query, right click on this link: simbad:2012MNRAS.419..184A and select 'bookmark this link' or equivalent in the popup menu