scholarly journals Search for HI in Dwarf Spheroidal Galaxies

1999 ◽  
Vol 16 (1) ◽  
pp. 18-23 ◽  
Author(s):  
Claude Carignan
Keyword(s):  
General Problem ◽  
Local Group ◽  
Wide Field ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

AbstractAfter reviewing the HI content and distribution in extreme dwarf irregular (dIrr) and dwarf elliptical (dE) galaxies, previous searches for HI in dwarf spheroidal (dSph) galaxies will be discussed. I will report on the recent detections of HI probably associated with the Local Group (LG) dSph Sculptor and dIrr/dSph Phoenix, obtained with the ATCA, along with a similar detection in the Centaurus Group dSph CEN_41. Data obtained for Sculptor, using the Parkes Multibeam system, will also be presented and the advantage of the wide field for such nearby objects will be emphasised. Finally, the possible origin of the gas and the general problem of the missing ISM in dSph galaxies will be discussed.

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

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.

The Local Group Dwarf Spheroidal Galaxies: A Key to Building Blocks in the Universe

2005 ◽  
Vol 201 ◽  
pp. 469-470
Author(s):  
Hiroyuki. Hirashita ◽  
Naoyuki. Tamura ◽  
Tsutomu T. Takeuchi
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Building Blocks ◽  
Star Formation History ◽  
High Mass ◽  
Dwarf Spheroidal Galaxies ◽  
The Hierarchical Structure ◽  
History Of ◽  
Low Mass ◽  
Spheroidal Galaxies

Recent studies have been revealing the properties of dwarf spheroidal galaxies (dSphs). Their low mass indicates that the dSphs may provide a clue to physical properties of the building blocks in the hierarchical structure formation. We select the Local Group dSphs as a sample. To obtain the information on the star formation history of dSphs, we investigate the relation between their metallicity and virial mass. According to our scenario, the star formation efficiency of the dSphs is low because of strong regulation. This is consistent with their high mass-to-light ratios. We also comment on the environmental effects on the dSphs.

scholarly journals The evolution of the photometric properties of Local Group dwarf spheroidal galaxies

2008 ◽  
Vol 484 (1) ◽  
pp. 107-118 ◽  
Author(s):  
F. Calura ◽  
G. A. Lanfranchi ◽  
F. Matteucci
Keyword(s):  
Local Group ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

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.

scholarly journals Proper Motions of Local Group Dwarf Spheroidal Galaxies I: First Ground-Based Results for Fornax1

2010 ◽  
Vol 122 (893) ◽  
pp. 853-875 ◽  
Author(s):  
René. A. Méndez ◽  
Edgardo Costa ◽  
Mario H. Pedreros ◽  
Maximiliano Moyano ◽  
Martin Altmann ◽  
...  
Keyword(s):  
Local Group ◽  
Proper Motions ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

scholarly journals Internal Dynamics of Local Group Galaxies

1999 ◽  
Vol 192 ◽  
pp. 383-394 ◽  
Author(s):  
K. C. Freeman
Keyword(s):  
Local Group ◽  
Disk Galaxy ◽  
Internal Dynamics ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

This talk reviews the internal dynamics of some of the different classes of Local Group galaxies. These include the dwarf spheroidal galaxies, the pure disk galaxy M33, the LMC and M31. The talk concludes with some general remarks about bulges and halos.

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