scholarly journals The Disk and Dark Halo Mass of the Barred Galaxy NGC 4123. II. Fluid‐Dynamical Models

2001 ◽  
Vol 546 (2) ◽  
pp. 931-951 ◽  
Author(s):  
Benjamin J. Weiner ◽  
J. A. Sellwood ◽  
T. B. Williams
Keyword(s):  
Dark Halo ◽  
Dynamical Models

scholarly journals The Newtonian and MOND dynamical models of NGC 5128: Investigation of the dark matter contribution

2016 ◽  
pp. 9-20 ◽  
Author(s):  
S. Samurovic
Keyword(s):  
Dark Matter ◽  
Globular Clusters ◽  
Velocity Dispersion ◽  
Good Description ◽  
Isotropic Case ◽  
Dark Halo ◽  
Dynamical Models ◽  
Anisotropic Case ◽  
Early Type Galaxy ◽  
Centaurus A

We study the well-known nearby early-type galaxy NGC 5128 (Centaurus A) and use the sample of its globular clusters to analyze its dynamics. We study both Newtonian and MOND models assuming three cases of orbital anisotropies: isotropic case, mildly tangentially anisotropic case and the radially anisotropic case based on the literature. We find that there are two regions with different values of the velocity dispersion: interior to ~ 3 effective radii the value of the velocity dispersion is approximately 150 km s?1 , whereas beyond ~ 3 effective radii its value increases to approximately 190 km s?1 , thus implying the increase of the total cumulative mass which is indicative of the existence of dark matter there in the Newtonian approach: the mass-to-light increases from M/LB = 7 in the inner regions to M/LB = 26 in the outer regions. We found that the Navarro-Frenk-White (NFW) model with dark halo provides good description of the dynamics of NGC 5128. Using three MOND models (standard, simple and toy), we find that they all provide good fits to the velocity dispersion of NGC 5128 and that no additional dark component is needed in MOND.

scholarly journals Dynamical models of two lenticular galaxies: NGC 1023 and NGC 4526

2017 ◽  
pp. 9-21 ◽  
Author(s):  
S. Samurovic
Keyword(s):  
Globular Clusters ◽  
Velocity Dispersion ◽  
Kinematics And Dynamics ◽  
Dark Halo ◽  
Constant Mass ◽  
Dynamical Models ◽  
Dynamical Modeling ◽  
Dynamical Mass ◽  
Lenticular Galaxies ◽  
White Form

We study kinematics and dynamics of two lenticular galaxies that possess globular clusters (GCs) which extend beyond approximately seven effective radii. We analyze two nearby lenticular galaxies, NGC 1023 and NGC 4526, based on their GCs. We extract the kinematics of these galaxies and use it for dynamical modeling based on the Jeans equation. The Jeans equation was solved in both the Newtonian mass-follows-light approach assuming constant mass-to-light ratio and assuming a dark halo in the Navarro-Frenk-White form. We find that while the first galaxy, NGC 1023, does not need a significant amount of dark matter, in the other galaxy, NGC 4526, the dark component fully dominates stellar matter in the total dynamical mass. In this paper we also used three different MOND approaches and found that while for both galaxies MOND models can provide successful fits of the observed velocity dispersion, in the case of NGC 4526 we have a hint of an additional dark component even in the MOND framework.

The 3D Topology of the Clausius Virial for Two Component Dynamical Models of Elliptical Galaxies

2006 ◽  
Vol 2 (S235) ◽  
pp. 146-146
Author(s):  
T. Valentinuzzi ◽  
L. Secco ◽  
M. D'Onofrio ◽  
R. Caimmi ◽  
D. Bindoni
Keyword(s):  
Potential Energy ◽  
Power Law ◽  
Large Scale ◽  
Elliptical Galaxies ◽  
Dark Halo ◽  
Dynamical Models ◽  
Density Profiles ◽  
Two Component ◽  
3D Topology ◽  
Scale Length

AbstractAs found in Secco (2000, 2001), the presence of a (non-baryonic) dark halo in large-scale celestial objects, can induce a scale length on the luminous spheroid through the occurrence of an unexpected maximum in the virial potential energy (Clausius Virial, CV). The above mentioned investigations were grounded on two cored power law density profiles, but the same result is shown to hold for more refined and realistic models.

The Shape and Figure Rotation of the Dark Halo of NGC 2915

1999 ◽  
Vol 118 (5) ◽  
pp. 2158-2171 ◽  
Author(s):  
M. Bureau ◽  
K. C. Freeman ◽  
D. W. Pfitzner ◽  
G. R. Meurer
Keyword(s):  
Dark Halo ◽  
Figure Rotation

Improved Evidence for a Black Hole in M32 fromHST/FOS Spectra. II. Axisymmetric Dynamical Models

1998 ◽  
Vol 493 (2) ◽  
pp. 613-631 ◽  
Author(s):  
Roeland P. van der Marel ◽  
N. Cretton ◽  
P. Tim de Zeeuw ◽  
Hans‐Walter Rix
Keyword(s):  
Black Hole ◽  
Dynamical Models

scholarly journals Precipitation downscaling under climate change: Recent developments to bridge the gap between dynamical models and the end user

2010 ◽  
Vol 48 (3) ◽  
Author(s):  
D. Maraun ◽  
F. Wetterhall ◽  
A. M. Ireson ◽  
R. E. Chandler ◽  
E. J. Kendon ◽  
...  
Keyword(s):  
Climate Change ◽  
End User ◽  
Dynamical Models ◽  
Recent Developments

scholarly journals The geometric structures and instability of entropic dynamical models

2011 ◽  
Vol 227 (1) ◽  
pp. 459-471 ◽  
Author(s):  
Linyu Peng ◽  
Huafei Sun ◽  
Dandi Sun ◽  
Jin Yi
Keyword(s):  
Dynamical Models ◽  
Geometric Structures
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