The Search for Dark Matter in Draco and Ursa Minor: A Three Year Progress Report

1987 ◽  
pp. 153-160 ◽  
Author(s):  
M. Aaronson ◽  
E. Olszewski
Keyword(s):  
Dark Matter ◽  
Progress Report ◽  
Ursa Minor

scholarly journals The Search for Dark Matter in Draco and Ursa Minor: A Three Year Progress Report

1987 ◽  
Vol 117 ◽  
pp. 153-160 ◽  
Author(s):  
M. Aaronson ◽  
E. Olszewski
Keyword(s):  
Dark Matter ◽  
Velocity Dispersion ◽  
Progress Report ◽  
Radial Velocities ◽  
Circumstantial Evidence ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Stellar Velocity ◽  
Atmospheric Motions ◽  
Matter Component

We report the cumulative results of an on-going effort to measure the stellar velocity dispersion in two nearby dwarf spheroidal galaxies. Radial velocities having an accuracy ≲ 2 km s−1 have now been secured for ten stars in Ursa Minor and eleven stars in Draco (including 16 K giants and 5 C types). Most objects have been observed at two or more epochs. Stars having non-variable velocities yield in both dwarfs a large (∼ 10 km s−1) dispersion. These results cannot be explained by atmospheric motions, and circumstantial evidence suggests that the effects of undetected binaries are also not likely to be important. Instead, it seems that both spheroidals contain a substantial dark matter component, which therefore must be “cold” in form.

Progress report from the UK Dark Matter search at Boulby Mine

2000 ◽  
Vol 87 (1-3) ◽  
pp. 64-66 ◽  
Author(s):  
I. Liubarsky ◽  
G.J. Alner ◽  
B. Ahmed ◽  
J.C. Barton ◽  
A. Bewick ◽  
...  
Keyword(s):  
Dark Matter ◽  
Progress Report ◽  
Dark Matter Search ◽  
The Uk

The dark matter halos of Draco and Ursa Minor

1990 ◽  
Vol 100 ◽  
pp. 127 ◽  
Author(s):  
Carlton Pryor ◽  
John Kormendy
Keyword(s):  
Dark Matter ◽  
Dark Matter Halos ◽  
Ursa Minor

Black hole models for the dark matter in Draco and Ursa Minor

1994 ◽  
Vol 424 ◽  
pp. L83 ◽  
Author(s):  
Nicolas V. Strobel ◽  
George Lake
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Ursa Minor

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 Too big to fail in light of Gaia

2019 ◽  
Vol 490 (1) ◽  
pp. 231-242 ◽  
Author(s):  
Manoj Kaplinghat ◽  
Mauro Valli ◽  
Hai-Bo Yu
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Large Scatter ◽  
Too Big To Fail ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

ABSTRACT We point out an anticorrelation between the central dark matter (DM) densities of the bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances inferred from Gaia data. The dSphs that have not come close to the Milky Way centre (like Fornax, Carina and Sextans) are less dense in DM than those that have come closer (like Draco and Ursa Minor). The same anticorrelation cannot be inferred for the ultrafaint dSphs due to large scatter, while a trend that dSphs with more extended stellar distributions tend to have lower DM densities emerges with ultrafaints. We discuss how these inferences constrain proposed solutions to the Milky Way’s too-big-to-fail problem and provide new clues to decipher the nature of DM.

Progress report on the search for cold dark matter using ultralow-background germanium detectors at homestake

1992 ◽  
Vol 28 (1) ◽  
pp. 293-296 ◽  
Author(s):  
A.K. Drukier ◽  
F.T. Avignone ◽  
R.L. Brodzinski ◽  
J.I. Collar ◽  
G. Gelmini ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Progress Report ◽  
Germanium Detectors

scholarly journals DARK MATTER SUBHALOS IN THE URSA MINOR DWARF GALAXY

2012 ◽  
Vol 757 (1) ◽  
pp. 87 ◽  
Author(s):  
V. Lora ◽  
A. Just ◽  
F. J. Sánchez-Salcedo ◽  
E. K. Grebel
Keyword(s):  
Dark Matter ◽  
Dwarf Galaxy ◽  
Ursa Minor

scholarly journals Formation of Large Scale Structure in the Explosion Scenario

1987 ◽  
Vol 117 ◽  
pp. 286-286
Author(s):  
S. Saarinen ◽  
A. Dekel ◽  
B.J. Carr
Keyword(s):  
Dark Matter ◽  
Similarity Solution ◽  
Large Scale ◽  
Large Scale Structure ◽  
Progress Report ◽  
Scale Structure ◽  
Expansion Velocity ◽  
Point Particles ◽  
Expanding Shells

This is a progress report on a study of the formation of large scale structure in the explosive amplification scenario, using N-body simulations. The simulations start when galaxies of the last generation form. The galaxies are distributed at random in expanding shells around random seeds. They start with an expansion velocity 20% larger than the Hubble velocity, in accordance with the similarity solution that was valid before the gaseous shells fragmented into galaxies. The galaxies are treated thereafter as softened point particles that interact only gravitationally, embedded in an N-body background representing inter-shell gas and dark matter (in variable amounts).

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