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2009MNRAS.398..561W - Mon. Not. R. Astron. Soc., 398, 561-574 (2009/September-2)
Stellar velocity profiles and line strengths out to four effective radii in the early-type galaxies NGC3379 and 821.
WEIJMANS A.-M., CAPPELLARI M., BACON R., DE ZEEUW P.T., EMSELLEM E., FALCON-BARROSO J., KUNTSCHNER H., McDERMID R.M., VAN DEN BOSCH R.C.E. and VAN DE VEN G.
Abstract (from CDS):
We find that the line strength gradients previously observed within 1 Re remain constant out to at least 4 Re, which puts constraints on the merger histories of these galaxies. The stellar halo populations are old and metal poor. By constructing orbit-based Schwarzschild dynamical models, we find that dark matter is necessary to explain the observed kinematics in NGC 3379 and 821, with 30-50 per cent of the total matter being dark within 4 Re. The radial anisotropy in our best-fitting halo models is less than in our models without halo, due to differences in orbital structure. The halo also has an effect on the Mgb-Vescrelation: its slope is steeper when a dark matter halo is added to the model.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: haloes - galaxies: individual: NGC 3379 - galaxies: individual: NGC 821 - galaxies: kinematics and dynamics - dark matter
Simbad objects: 4
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