scholarly journals The X-Shooter Lens Survey - I. Dark matter domination and a Salpeter-type initial mass function in a massive early-type galaxy

2011 ◽  
Vol 417 (4) ◽  
pp. 3000-3009 ◽  
Author(s):  
C. Spiniello ◽  
L. V. E. Koopmans ◽  
S. C. Trager ◽  
O. Czoske ◽  
T. Treu
Keyword(s):  
Dark Matter ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Early Type ◽  
Early Type Galaxy

scholarly journals EVIDENCE FOR DARK MATTER CONTRACTION AND A SALPETER INITIAL MASS FUNCTION IN A MASSIVE EARLY-TYPE GALAXY

2012 ◽  
Vol 752 (2) ◽  
pp. 163 ◽  
Author(s):  
A. Sonnenfeld ◽  
T. Treu ◽  
R. Gavazzi ◽  
P. J. Marshall ◽  
M. W. Auger ◽  
...  
Keyword(s):  
Dark Matter ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Early Type ◽  
Early Type Galaxy

scholarly journals Further evidence for large central mass-to-light ratios in massive early-type galaxies

2012 ◽  
Vol 8 (S295) ◽  
pp. 225-228
Author(s):  
E. M. Corsini ◽  
G. A. Wegner ◽  
J. Thomas ◽  
R. P. Saglia ◽  
R. Bender ◽  
...  
Keyword(s):  
Dark Matter ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Dynamical Structure ◽  
Early Type ◽  
Central Mass ◽  
Dynamical Mass ◽  
Massive Galaxies ◽  
Element Abundances

AbstractWe studied the stellar populations, distribution of dark matter, and dynamical structure of a sample of 25 early-type galaxies in the Coma and Abell~262 clusters. We derived dynamical mass-to-light ratios and dark matter densities from orbit-based dynamical models, complemented by the ages, metallicities, and α-element abundances of the galaxies from single stellar population models. Most of the galaxies have a significant detection of dark matter and their halos are about 10 times denser than in spirals of the same stellar mass. Calibrating dark matter densities to cosmological simulations we find assembly redshifts zDM ≈ 1–3. The dynamical mass that follows the light is larger than expected for a Kroupa stellar initial mass function, especially in galaxies with high velocity dispersion σeff inside the effective radius reff. We now have 5 of 25 galaxies where mass follows light to 1–3 reff, the dynamical mass-to-light ratio of all the mass that follows the light is large (≈ 8–10 in the Kron-Cousins R band), the dark matter fraction is negligible to 1–3 reff. This could indicate a ‘massive’ initial mass function in massive early-type galaxies. Alternatively, some of the dark matter in massive galaxies could follow the light very closely suggesting a significant degeneracy between luminous and dark matter.

scholarly journals Radial variations in the stellar initial mass function of early-type galaxies

2014 ◽  
Vol 447 (2) ◽  
pp. 1033-1048 ◽  
Author(s):  
Ignacio Martín-Navarro ◽  
Francesco La Barbera ◽  
Alexandre Vazdekis ◽  
Jesús Falcón-Barroso ◽  
Ignacio Ferreras
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Early Type ◽  
Stellar Initial Mass Function

scholarly journals EVIDENCE FOR A CONSTANT INITIAL MASS FUNCTION IN EARLY-TYPE GALAXIES BASED ON THEIR X-RAY BINARY POPULATIONS,

2014 ◽  
Vol 784 (2) ◽  
pp. 162 ◽  
Author(s):  
Mark B. Peacock ◽  
Stephen E. Zepf ◽  
Thomas J. Maccarone ◽  
Arunav Kundu ◽  
Anthony H. Gonzalez ◽  
...  
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Early Type ◽  
X Ray
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