Abundance variations on the giant branches of the sculptor and Ursa Minor dwarf spheroidal galaxies and the Omega Centauri anomaly

1978 ◽  
Vol 225 ◽  
pp. L49 ◽  
Author(s):  
J. Norris ◽  
M. S. Bessell
Keyword(s):  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

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.

The Draco and Ursa Minor Dwarf Spheroidal Galaxies: A Comparative Study

2002 ◽  
Vol 124 (6) ◽  
pp. 3222-3240 ◽  
Author(s):  
M. Bellazzini ◽  
F. R. Ferraro ◽  
L. Origlia ◽  
E. Pancino ◽  
L. Monaco ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

scholarly journals Kinematically Cold Populations at Large Radii in the Draco and Ursa Minor Dwarf Spheroidal Galaxies

2004 ◽  
Vol 611 (1) ◽  
pp. L21-L24 ◽  
Author(s):  
Mark I. Wilkinson ◽  
Jan T. Kleyna ◽  
N. Wyn Evans ◽  
Gerard F. Gilmore ◽  
Michael J. Irwin ◽  
...  
Keyword(s):  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

scholarly journals Proper Motions of Dwarf Spheroidal Galaxies fromHubble Space TelescopeImaging. III. Measurement for Ursa Minor

2005 ◽  
Vol 130 (1) ◽  
pp. 95-115 ◽  
Author(s):  
Slawomir Piatek ◽  
Carlton Pryor ◽  
Paul Bristow ◽  
Edward W. Olszewski ◽  
Hugh C. Harris ◽  
...  
Keyword(s):  
Proper Motions ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

scholarly journals A Search for Ionized Gas in the Draco and Ursa Minor Dwarf Spheroidal Galaxies

2003 ◽  
Vol 588 (1) ◽  
pp. 326-330 ◽  
Author(s):  
J. S. Gallagher ◽  
G. J. Madsen ◽  
R. J. Reynolds ◽  
E. K. Grebel ◽  
T. A. Smecker‐Hane
Keyword(s):  
Ionized Gas ◽  
Dwarf Spheroidal Galaxies ◽  
Ursa Minor ◽  
Spheroidal Galaxies

Exploring Halo Substructure with Giant Stars: The Velocity Dispersion Profiles of the Ursa Minor and Draco Dwarf Spheroidal Galaxies at Large Angular Separations

2005 ◽  
Vol 631 (2) ◽  
pp. L137-L141 ◽  
Author(s):  
Ricardo R. Muñoz ◽  
Peter M. Frinchaboy ◽  
Steven R. Majewski ◽  
Jeffrey R. Kuhn ◽  
Mei-Yin Chou ◽  
...  
Keyword(s):  
Velocity Dispersion ◽  
Dwarf Spheroidal Galaxies ◽  
Giant Stars ◽  
Ursa Minor ◽  
Spheroidal Galaxies

scholarly journals Abundance Patterns in the Draco, Sextans, and Ursa Minor Dwarf Spheroidal Galaxies

2001 ◽  
Vol 548 (2) ◽  
pp. 592-608 ◽  
Author(s):  
Matthew D. Shetrone ◽  
Patrick Cote ◽  
W. L. W. Sargent
Keyword(s):  
Dwarf Spheroidal Galaxies ◽  
Abundance Patterns ◽  
Ursa Minor ◽  
Spheroidal Galaxies
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