The Dark Matter Content of Early-Type Galaxies

2010 ◽  
Author(s):  
Ignacio Ferreras ◽  
Victor P. Debattista ◽  
C. C. Popescu
Keyword(s):  
Dark Matter ◽  
Matter Content ◽  
Early Type

scholarly journals Is there a dichotomy in the Dark Matter as well as in the Baryonic Matter properties of ellipticals?

2004 ◽  
Vol 220 ◽  
pp. 173-174
Author(s):  
N. R. Napolitano ◽  
M. Capaccioli ◽  
M. Arnaboldi ◽  
M. R. Merrifield ◽  
N. G. Douglas ◽  
...  
Keyword(s):  
Dark Matter ◽  
Structural Parameters ◽  
Matter Content ◽  
Baryonic Matter ◽  
Early Type

We have found a correlation between the M / L global gradients and the structural parameters of the luminous components of a sample of 19 early-type galaxies. Such a correlation supports the hypothesis that there is a connection between the dark matter content and the evolution of the baryonic component in such systems.

scholarly journals Dark-Matter Content of Early-Type Galaxies with Planetary Nebulae

2007 ◽  
Vol 3 (S244) ◽  
pp. 289-294 ◽  
Author(s):  
N. R. Napolitano ◽  
A. J. Romanowsky ◽  
L. Coccato ◽  
M. Capaccioli ◽  
N. G. Douglas ◽  
...  
Keyword(s):  
Dark Matter ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Matter Content ◽  
The Other ◽  
Early Type ◽  
Scientific Objective ◽  
Target Sample ◽  
The Galaxy ◽  
William Herschel

AbstractWe examine the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes. We have designed a specialised instrument, the Planetary Nebula Spectrograph (PN.S) operating at the William Herschel telescope, with the purpose of measuring PN velocities with best efficiency. The primary scientific objective of this custom-built instrument is the study of the PN kinematics in 12 ordinary round galaxies. Preliminary results showing a dearth of dark matter in ordinary galaxies (Romanowskyet al. 2003) are now confirmed by the first complete PN.S datasets. On the other hand early-type galaxies with a “regular” dark matter content are starting to be observed among the brighter PN.S target sample, thus confirming a correlation between the global dark-to-luminous mass virial ratio (fDM=MDMM*) and the galaxy luminosity and mass.

scholarly journals Low dark matter content of the nearby early-type galaxy NGC 821

2014 ◽  
pp. 29-36 ◽  
Author(s):  
S. Samurovic ◽  
A. Vudragovic ◽  
M. Jovanovic ◽  
M.M. Cirkovic
Keyword(s):  
Dark Matter ◽  
Globular Clusters ◽  
Planetary Nebulae ◽  
Matter Content ◽  
Kinematics And Dynamics ◽  
Constant Mass ◽  
Early Type ◽  
Kinematic Data ◽  
Early Type Galaxy ◽  
Dynamical Modelling

In this paper we analyze the kinematics and dynamics of the nearby early-type galaxy NGC 821 based on its globular clusters (GCs) and planetary nebulae (PNe). We use PNe and GCs to extract the kinematics of NGC 821 which is then used for the dynamical modelling based on the Jeans equation. We apply the Jeans equation using the Newtonian mass-follows-light approach assuming constant mass-to-light ratio and find that using such an approach we can successfully fit the kinematic data. The inferred constant mass-to-light ratio, 4:2 < M=LB < 12:4 present throughout the whole galaxy, implies the lack of significant amount of dark matter. We also used three different MOND approaches and found that we can fit the kinematic data without the need for additional, dark, component.

scholarly journals Bulge properties and dark matter content of early-type barred galaxies

2007 ◽  
Vol 3 (S245) ◽  
pp. 125-128
Author(s):  
E. M. Corsini
Keyword(s):  
Dark Matter ◽  
Direct Method ◽  
Matter Content ◽  
Dark Matter Halos ◽  
Early Type ◽  
Indirect Methods ◽  
Barred Galaxies ◽  
Gaseous Component ◽  
Stellar Component ◽  
Pattern Speed

AbstractThe dynamics of a barred galaxy depends on the pattern speed of its bar. The only direct method for measuring the pattern speed of a bar is the Tremaine-Weinberg technique. This method is best suited to the analysis of the distribution and dynamics of the stellar component. Therefore it has been mostly used for early-type barred galaxies. Most of them host a classical bulge. On the other hand, a variety of indirect methods, which are based on the analysis of the distribution and dynamics of the gaseous component, has been used to measure the bar pattern speed in late-type barred galaxies. Nearly all the measured bars are as rapidly rotating as they can be. By comparing this result with high-resolution numerical simulations of bars in dark matter halos, it is possible to conclude that these bars reside in maximal disks.

scholarly journals Fast and slow rotators: the build-up of the red sequence

2007 ◽  
Vol 3 (S245) ◽  
pp. 11-14
Author(s):  
Eric Emsellem ◽  
Michele Cappellari ◽  
Davor Krajnović ◽  
Glenn van de Ven ◽  
R. Bacon ◽  
...  
Keyword(s):  
Dark Matter ◽  
Angular Momentum ◽  
Large Scale ◽  
Stellar Populations ◽  
Matter Content ◽  
Orbital Structure ◽  
Early Type ◽  
Secular Evolution ◽  
Unique Dataset ◽  
Red Sequence

AbstractUsing the unique dataset obtained within the course of theSAURONproject, a radically new view of the structure, dynamics and stellar populations of early-type galaxies has emerged. We show that galaxies come in two broad flavours (slow and fast rotators), depending on whether or not they exhibit clear large-scale rotation, as indicated via a robust measure of the specific angular momentum of baryons. This property is also linked with other physical characteristics of early-type galaxies, such as: the presence of dynamically decoupled cores, orbital structure and anisotropy, stellar populations and dark matter content. I here report on the observed link between this baryonic angular momentum and a mass sequence, and how this uniquely relates to the building of the red sequence via dissipative/dissipationless mergers and secular evolution.

scholarly journals Empirical Scaling Relations

2009 ◽  
Vol 5 (H15) ◽  
pp. 80-80
Author(s):  
Tommaso Treu
Keyword(s):  
Dark Matter ◽  
Gravitational Potential ◽  
Matter Content ◽  
Scaling Relations ◽  
Early Type ◽  
Physical Processes ◽  
Formation And Evolution

AbstractEarly-type galaxies do not come in any shape, form, and color. Many of their observable properties obey tight correlations, also known as empirical scaling relations. The correlations are non-trivial, in the sense that they cannot be explained by simple physical or dimensional arguments. A subset of the empirical scaling relations connects baryonic observables with quantities that depend on the total gravitational potential of the galaxies, and thus on their dark matter content. These correlations are a fundamental testbed for our understanding of the formation and evolution of early-type galaxies, and, more in general, of the physical processes that determine the interplay between baryons and dark matter at galactic scales.

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