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2009MNRAS.393..329N - Mon. Not. R. Astron. Soc., 393, 329-353 (2009/February-3)
The planetary nebula spectrograph elliptical galaxy survey: the dark matter in NGC 4494.
NAPOLITANO N.R., ROMANOWSKY A.J., COCCATO L., CAPACCIOLI M., DOUGLAS N.G., NOORDERMEER E., GERHARD O., ARNABOLDI M., DE LORENZI F., KUIJKEN K., MERRIFIELD M.R., O'SULLIVAN E., CORTESI A., DAS P. and FREEMAN K.C.
Abstract (from CDS):
We have constructed spherical dynamical models of the system, including Jeans analyses with multi-component Λ cold dark matter (CDM) motivated galaxies as well as logarithmic potentials. These models include special attention to orbital anisotropy, which we constrain using fourth-order velocity moments. Given several different sets of modelling methods and assumptions, we find consistent results for the mass profile within the radial range constrained by the data. Some dark matter (DM) is required by the data; our best-fitting solution has a radially anisotropic stellar halo, a plausible stellar mass-to-light ratio and a DM halo with an unexpectedly low central density. We find that this result does not substantially change with a flattened axisymmetric model.
Taken together with other results for galaxy halo masses, we find suggestions for a puzzling pattern wherein most intermediate-luminosity galaxies have very low concentration haloes, while some high-mass ellipticals have very high concentrations. We discuss some possible implications of these results for DM and galaxy formation.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): planetary nebulae: general - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 4494 - galaxies: kinematics and dynamics - galaxies: structure - dark matter
VizieR on-line data: <Available at CDS (J/MNRAS/393/329): table3.dat>
Nomenclature: Table 3: PNS-EPN NGC4494-NNN (Nos 1-267).
Simbad objects: 280