scholarly journals Observed Properties of Dark Matter on Small Spatial Scales

2007 ◽  
Vol 3 (S244) ◽  
pp. 44-52 ◽  
Author(s):  
Rosemary F.G. Wyse ◽  
Gerard Gilmore
Keyword(s):  
Dark Matter ◽  
Galaxy Evolution ◽  
Local Group ◽  
Spatial Scales ◽  
Critical Role ◽  
Large Datasets ◽  
Dwarf Spheroidal Galaxies ◽  
Internal Motions ◽  
Spheroidal Galaxies

AbstractThe nature of dark matter is one of the outstanding questions of astrophysics. The internal motions of member stars reveal that the lowest luminosity galaxies in the Local Group are the most dark-matter dominated. New large datasets allow one to go further, and determine systematic properties of their dark matter haloes. We summarise recent results, emphasising the critical role of the dwarf spheroidal galaxies in understanding both dark matter and baryonic processes that shape galaxy evolution.

scholarly journals Evidence for Light-weight Local Group Dwarf Spheroidal Galaxies

2004 ◽  
Vol 220 ◽  
pp. 365-366
Author(s):  
J. R. Kuhn ◽  
D. Kocevski
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Local Group ◽  
Light Weight ◽  
Natural Explanation ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Matter Component ◽  
Morphological State ◽  
Spheroidal Galaxies

A simple and natural explanation for the dynamics and morphology of the Local Group Dwarf Spheroidal galaxies, Draco (Dra) and Ursa Minor (UMi), is that they are weakly unbound stellar systems with no significant dark matter component. A gentle, but persistent, Milky Way (MW) tide has left them in their current kinematic and morphological state (the “parametric tidal excitation”). A new test of a dark matter dominated dS potential follows from a careful observation of the “clumpiness” of the dS stellar surface density.

scholarly journals Implication of Dark Matter Content in Dwarf Spheroidal Galaxies

1999 ◽  
Vol 192 ◽  
pp. 402-408
Author(s):  
H. Hirashita ◽  
T. T. Takeuchi ◽  
H. Kamaya
Keyword(s):  
Dark Matter ◽  
Local Group ◽  
Matter Content ◽  
Dwarf Spheroidal Galaxies ◽  
Large Velocity ◽  
The Galaxy ◽  
Correlation Tests ◽  
Tidal Heating ◽  
Physical Quantities ◽  
Spheroidal Galaxies

We investigate the dark matter (DM) content in the Local Group dwarf spheroidal galaxies (dSphs) by examining the correlations among their physical quantities. Two origins of the large velocity dispersions of the dSphs are possible: [1] the existence of DM and [2] tidal heating by the Galaxy. The correlation tests support both [1] and [2]. We finally mention circumstantial evidence for the existence of DM in the dSphs.

Stellar chemo-kinematics of isolated dwarf spheroidal galaxies

2018 ◽  
Vol 14 (S344) ◽  
pp. 222-223
Author(s):  
S. Taibi ◽  
G. Battaglia ◽  
M. Rejkuba ◽  
N. Kacharov ◽  
M. Zoccali
Keyword(s):  
Galaxy Evolution ◽  
Milky Way ◽  
Local Group ◽  
Intrinsic Properties ◽  
Dwarf Spheroidal Galaxies ◽  
Preliminary Results ◽  
Low Mass ◽  
Insight Into ◽  
Spheroidal Galaxies

AbstractThe study of dwarf spheroidal galaxies (dSph) is of great importance to understand galaxy evolution at the low-mass end. In the Local Group the majority of them are found to be satellites of the Milky Way or M31. The closest ones have been studied in great detail, however it is hard to constrain if their present-day observed properties are mainly caused by internal or environmental mechanisms. In order to minimize these effects and gain an insight into their intrinsic properties, we are studying two of the three isolated dSph galaxies in the Local Group, i.e. Cetus and Tucana, located far beyond the virial radius of the Milky Way and M31. We present here results from our recently published analysis of Cetus (Taibi2018) and preliminary results for Tucana (Taibi et al. in prep.).

The role of internal feedback in the evolution of the dwarf spheroidal galaxy Leo II

2019 ◽  
Vol 15 (S359) ◽  
pp. 278-279
Author(s):  
Roberto Hazenfratz ◽  
Gustavo A. Lanfranchi ◽  
Anderson Caproni
Keyword(s):  
Large Distance ◽  
Milky Way ◽  
Local Group ◽  
Galactic Evolution ◽  
External Effects ◽  
Dwarf Spheroidal Galaxies ◽  
First Results ◽  
Formation And Evolution ◽  
Spheroidal Galaxies

AbstractThis work aims to explore the different processes of formation and evolution of dwarf spheroidal galaxies in the Local Group analyzing internal and external feedbacks, taking Leo II as a model of parametrization due to its adequate large distance to the Milky Way, in order to minimize potential external effects. We present a discussion of the first results regarding the processes of formation and galactic evolution from the gas hydrodynamics. Combined with previous studies for other similar systems, such results have the potential to establish strong links for the elaboration of a consistent and coherent scenario of formation and evolution of the dwarf spheroidal galaxies in the Local Group.

scholarly journals J-factors for self-interacting dark matter in 20 dwarf spheroidal galaxies

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Sebastian Bergström ◽  
Riccardo Catena ◽  
Andrea Chiappo ◽  
Jan Conrad ◽  
Björn Eurenius ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

scholarly journals Jeans analysis for dwarf spheroidal galaxies in wave dark matter

2017 ◽  
Vol 468 (2) ◽  
pp. 1338-1348 ◽  
Author(s):  
Shu-Rong Chen ◽  
Hsi-Yu Schive ◽  
Tzihong Chiueh
Keyword(s):  
Dark Matter ◽  
Dwarf Spheroidal Galaxies ◽  
Wave Dark Matter ◽  
Spheroidal Galaxies

scholarly journals Variable Stars in Dwarf Spheroidal Galaxies

1973 ◽  
Vol 21 ◽  
pp. 35-48
Author(s):  
Steven Van Agt
Keyword(s):  
Globular Clusters ◽  
Local Group ◽  
Elliptical Galaxies ◽  
Variable Stars ◽  
Dwarf Spheroidal Galaxies ◽  
Theoretical Predictions ◽  
History Of ◽  
Set Up ◽  
Theoretical Considerations ◽  
Spheroidal Galaxies

Interest in dwarf spheroidal galaxies is motivated by a number of reasons; an important one on the occasion of this colloquium is the abundance of variable stars. The theory of stellar evolution and stellar pulsations is now able to predict from theoretical considerations characteristic properties of variable stars in the colour-magnitude diagram (Iben, 1971). By observing the variable stars in the field, and in as wide a selection of objects as possible, more insight can be obtained into the history of the oldest members of our Galaxy (the globular clusters) and of the dwarf spheroidal galaxies in the Local Group. It is worthwhile to explore the spheroidal galaxies as observational tests for the theoretical predictions of conditions in space away from our Galaxy. The numbers of variable stars in the dwarf spheroidal galaxies are such that we may expect well-defined relations to emerge once reliable magnitude sequences have been set up, the variable stars found, and their periods determined. Six dwarf spheroidal galaxies are presently known in the Local Group within a distance of 250 kpc. In Table I, which lists members of the Local Group, they are at the low-luminosity end of the sequence of elliptical galaxies (van den Bergh, 1968).

scholarly journals THE MASSES OF LOCAL GROUP DWARF SPHEROIDAL GALAXIES: THE DEATH OF THE UNIVERSAL MASS PROFILE

2014 ◽  
Vol 783 (1) ◽  
pp. 7 ◽  
Author(s):  
Michelle L. M. Collins ◽  
Scott C. Chapman ◽  
R. M. Rich ◽  
Rodrigo A. Ibata ◽  
Nicolas F. Martin ◽  
...  
Keyword(s):  
Local Group ◽  
Dwarf Spheroidal Galaxies ◽  
Mass Profile ◽  
The Masses ◽  
Spheroidal Galaxies
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