Dynamical modelling of luminous and dark matter in 17 Coma early-type galaxies
By Jens Thomas, R. Saglia, Ralf Bender, D. Thomas, K. Gebhardt, J. Magorrian, E. Corsini, Gary Wegner. 2007
151 citations recorded by the source corpus.
Dynamical models for 17 early-type galaxies in the Coma cluster are presented. The galaxy sample consists of flattened, rotating as well as non-rotating early-types including cD and S0 galaxies with luminosities between MB = 18.79 and MB = 22.56. Kinematical long-slit observations cover at least the major and minor axis and extend to 1 4 reff. Axisymmetric Schwarzschild models are used to derive stellar mass-tolight ratios and dark halo parameters. In every galaxy the best fit with dark matter matches the data better than the best fit without. The statistical significance is over 95 percent for 8 galaxies, around 90 percent for 5 galaxies and for four galaxies it is not significant. For the highly significant cases systematic deviations between observed and modelled kinematics are clearly seen; for the remaining galaxies differences are more statistical in nature. Best-fit models contain 10-50 percent dark matter inside the half-light radius. The central dark matter density is at least one order of magnitude lower than the luminous mass density, independent of the assumed dark matter density profile. The central phase-space density of dark matter is often orders of magnitude lower than in the luminous component, especially when the halo core radius is large. The orbital system of the stars along the major-axis is slightly dominated by radial motions. Some galaxies show tangential anisotropy along the minor-axis, which is correlated with the minor-axis Gauss-Hermite coefficientH4. Changing the balance between data-fit and regularisation constraints does not change the reconstructed mass structure significantly: model anisotropies tend to strengthen if the weight on regularisation is reduced, but the general property of a galaxy to be radially or tangentially anisotropic, respectively, does not change. This paper is aimed to set the basis for a subsequent detailed analysis of luminous and dark matter scaling relations, orbital dynamics and stellar populations.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/164bed5a26bb551ec2d5d7ed4c3098cf4262a667
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- THE BLACK HOLE MASS, STELLAR MASS-TO-LIGHT RATIO, AND DARK HALO IN M87 (2009, background): “That fits with NFW and logarithmic halos yield similar result has also been found in other early-type galaxies (Thomas et al. 2005, 2007).”
- Measuring the inclination and mass-to-light ratio of axisymmetric galaxies via anisotropic Jeans models of stellar kinematics (2008, background): “…E-mail: cappellari@astro.ox.ac.uk rotator early-types (Gerhard et al. 2001; Rusin & Kochanek 2005; Cappellari et al. 2006; Koopmans et al. 2006; Thomas et al. 2007) and the spiral galaxies (Persic et al. 1996; Palunas & Williams 2000; Bell & de Jong 2001; Kassin et al. 2006) appear…”
- Galaxy Masses: A Review (2013, methodology): “Several recent studies have provided kinematic measurements of the integrated stellar light of ETGs beyond 3 − 4Re, using long-slit (Thomas et al. 2007; Proctor et al. 2009; Coccato et al. 2010; Arnold et al. 2011) or two-dimensional spectroscopy (Weijmans et al.”
- STRUCTURE AND FORMATION OF ELLIPTICAL AND SPHEROIDAL GALAXIES (2008, methodology): “They include additionalM/L values based on three-integral models (Gebhardt et al. 2003, 2007; Thomas et al. 2007), two-integral models of galaxies observed to very large radii (Kronawitter et al. 2000; Gerhard et al. 2001), and two-integral models of large galaxy samples (e. g., van der Marel 1991).”
- Kinematic properties of early-type galaxy haloes using planetary nebulae (2008, unknown): “…provide evidence for dark matter only in a fraction of ellipticals, with the inferred mass profiles being nearly isothermal to the limit of the data and the dark matter contributing ∼10–50 per cent of the mass within Re (e.g. Kronawitter et al. 2000; Gerhard et al. 2001; Thomas et al. 2007).”
- Physical properties and environments of nearby galaxies (2009, background): “Second, detailed modeling of the 2D dynamics using integral field measurements generally finds a variation of Mdyn/M∗ that is quantitatively similar to the virial estimates that assume homology (Cappellari et al. 2006; Thomas et al. 2007).”
- The ATLAS3D project XV: benchmark for early-type galaxies scaling relations from 260 dynamical models: mass-to-light ratio, dark matter, fundamental plane and mass plane (2012, methodology): “…Cappellari et al. (2006) inferred a median fDM ≈ 30 per cent by comparing dynamics and population masses of 25 ETGs, and assuming a universal IMF; Thomas et al. (2007b, 2011) measured fDM = 23 ± 17 per cent via axisymmetric dynamical models of 16 ETGs; Williams et al. (2009) measured a median…”
- Two-dimensional kinematics of SLACS lenses – III. Mass structure and dynamics of early-type lens galaxies beyond z ≃ 0.1 (2011, background): “…et al. 1994, Carollo et al. 1995, Rix et al. 1997, Loewenstein & White 1999, Gerhard et al. 2001, Borriello et al. 2003, van den Bosch et al. 2008, Thomas et al. 2007, 2009, 2011 and in particular the SAURON project, de Zeeuw et al. 2002, and the Atlas3D project, Cappellari et al. 2010), although…”
- Environment and self-regulation in galaxy formation (2009, background): “Note that this ‘dynamical’ mass should be a good approximation also of the baryonic mass, as baryonic matter is dominating the mass budget in early-type galaxies inside the effective radius (Cappellari et al. 2006; Thomas et al. 2007).”