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2006MNRAS.366.1253P - Mon. Not. R. Astron. Soc., 366, 1253-1264 (2006/March-2)
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379.
PIERCE M., BEASLEY M.A., FORBES D.A., BRIDGES T., GEBHARDT K., FAIFER F.R., FORTE J.C., ZEPF S.E., SHARPLES R., HANES D.A. and PROCTOR R.
Abstract (from CDS):
The projected velocity dispersion of the GC system is consistent with being constant with radius. Non-parametric, isotropic models require a significant increase in the mass-to-light ratio at large radii. This result is in contrast to that of Romanowsky et al., who recently found a decrease in the velocity dispersion profile as determined from planetary nebulae (PN). Our constant dispersion requires a normal-sized dark halo, although without anisotropic models we cannot rigorously determine the dark halo mass.
A two-sided χ2 test over all radii gives a 2σ difference between the mass profile derived from our GCs compared to the PN-derived mass model of Romanowsky et al. However, if we restrict our analysis to radii beyond one effective radius and test if the GC velocity dispersion is consistently higher, we determine a > 3σ difference between the mass models, and hence we favour the conclusion that NGC 3379 does indeed have dark matter at large radii in its halo.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): globular clusters: general - galaxies: individual: NGC 3379 - galaxies: kinematics and dynamics - galaxies: star clusters
Nomenclature: Table 1: [PBF2006] gNNNN N=22 among (Nos g114-g2122).
Simbad objects: 39
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