Surface brightness and color distributions of elliptical and S0 galaxies. I - The Coma cluster elliptical galaxies

1978 ◽  
Vol 83 ◽  
pp. 73 ◽  
Author(s):  
K. M. Strom ◽  
S. E. Strom
Keyword(s):  
Surface Brightness ◽  
Elliptical Galaxies ◽  
Coma Cluster ◽  
S0 Galaxies

scholarly journals A deep wide survey of faint low surface brightness galaxies in the direction of the Coma cluster of galaxies

2006 ◽  
Vol 459 (3) ◽  
pp. 679-692 ◽  
Author(s):  
C. Adami ◽  
R. Scheidegger ◽  
M. Ulmer ◽  
F. Durret ◽  
A. Mazure ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Coma Cluster ◽  
Cluster Of Galaxies ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

scholarly journals Surface brightness fluctuation distances for nearby dwarf elliptical galaxies

2001 ◽  
Vol 380 (1) ◽  
pp. 90-101 ◽  
Author(s):  
H. Jerjen ◽  
R. Rekola ◽  
L. Takalo ◽  
M. Coleman ◽  
M. Valtonen
Keyword(s):  
Surface Brightness ◽  
Elliptical Galaxies ◽  
Brightness Fluctuation ◽  
Dwarf Elliptical Galaxies

scholarly journals Kinematic Modelling of NGC 3379

1983 ◽  
Vol 100 ◽  
pp. 295-296
Author(s):  
Gary A. Mamon
Keyword(s):  
Surface Brightness ◽  
Elliptical Galaxies ◽  
Anisotropic Pressure ◽  
Velocity Anisotropy ◽  
Kinematic Modelling

Giant elliptical galaxies are now known to be supported by anisotropic pressure rather than by rotation (cf. Binney, 1981). This anisotropy can be derived from observable quantities for spherical systems as was shown by Binney and Mamon (1982) in their study of M87. We investigate here the velocity anisotropy of the El galaxy NGC 3379, a giant elliptical whose surface brightness constitutes an excellent illustration of the r1/4 law.

scholarly journals The Dark Halo – Spheroid Conspiracy

2012 ◽  
Vol 8 (S295) ◽  
pp. 208-208
Author(s):  
Rhea-Silvia Remus ◽  
Andreas Burkert ◽  
Klaus Dolag ◽  
Peter H. Johansson ◽  
Thorsten Naab ◽  
...  
Keyword(s):  
Elliptical Galaxies ◽  
Total Density ◽  
Dark Halo ◽  
Coma Cluster ◽  
Density Profiles ◽  
Stellar Component ◽  
Strong Lensing ◽  
The Galaxy ◽  
Good Agreement

AbstractObservational results from strong lensing and dynamical modeling indicate that the total density profiles of early-type galaxies are close to isothermal, i.e. ρtot ∝ rγ with γ ≈ −2. To understand the origin of this universal slope we study a set of simulated spheroids formed in cosmological hydrodynamical zoom-in simulations (see Oser et al. 2010 for more details). We find that the total stellar plus dark matter density profiles of all our simulations on average can be described by a power law with a slope of γ ≈ −2.1, with a tendency towards steeper slopes for more compact, lower mass ellipticals, while the total intrinsic velocity dispersion is flat for all simulations, independent of the values of γ. Our results are in good agreement with observations of Coma cluster ellipticals (Thomas et al. 2007) and results from strong lensing (Sonnenfeld et al. 2012). We find that for z ≳ 2 the majority of the stellar build-up occurs through in-situ star formation, i.e. the gas falls to the center of the galaxy and forms stars, causing the galaxy to be more compact and thus the stellar component to be more dominant. As a result, the total density slopes at z ≈ 2 are generally steeper (around γ ≈ −3). Between z = 2 and z = 0 galaxies grow mostly through dry merging, with each merging event shifting the slope more towards γ ≈ −2. We conclude from our simulations that the steepness of the slope of present day galaxies is a signature of the importance of mostly dry mergers in the formation of an elliptical, and suggest that all elliptical galaxies will with time end up in a configuration with a density slope of γ ≈ −2. For a more detailed analysis with a larger sample of simulations see Remus et al. (2013).

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