Local Group dwarf galaxies
E504050
Local Group dwarf galaxies are small, low-luminosity satellite galaxies gravitationally bound within the Local Group, typically orbiting larger galaxies like the Milky Way and Andromeda.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Local Group outskirts | 2 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
class of astronomical object
ⓘ
dwarf galaxy population ⓘ |
| containsSubtype |
dwarf irregular galaxies
ⓘ
dwarf spheroidal galaxies ⓘ transition-type dwarf galaxies ⓘ ultra-faint dwarf galaxies ⓘ |
| darkMatterToStellarMassRatio | very high compared to larger galaxies ⓘ |
| discoveredBy |
Dark Energy Survey
NERFINISHED
ⓘ
Pan-STARRS NERFINISHED ⓘ Sloan Digital Sky Survey NERFINISHED ⓘ various optical sky surveys ⓘ |
| environment |
within a few megaparsecs of the Milky Way
ⓘ
within the Local Group virial volume ⓘ |
| formationInfluencedBy |
cosmic reionization
ⓘ
feedback from supernovae ⓘ ram-pressure stripping ⓘ tidal stripping ⓘ |
| gravitationallyBoundTo |
Andromeda Galaxy
NERFINISHED
ⓘ
Milky Way NERFINISHED ⓘ |
| hasCharacteristic |
dominated by dark matter
ⓘ
low luminosity ⓘ low metallicity ⓘ low stellar mass ⓘ low surface brightness ⓘ often gas-poor ⓘ often pressure-supported ⓘ old stellar populations ⓘ small physical size ⓘ some with extended star-formation histories ⓘ |
| includes |
Andromeda satellite galaxies
ⓘ
Milky Way satellite galaxies NERFINISHED ⓘ isolated Local Group dwarfs ⓘ |
| kinematics | low velocity dispersions ⓘ |
| observedIn | Local Volume NERFINISHED ⓘ |
| orbits |
Andromeda Galaxy
NERFINISHED
ⓘ
Milky Way NERFINISHED ⓘ |
| partOf | Local Group NERFINISHED ⓘ |
| spatialDistribution | often aligned in planes around host galaxies ⓘ |
| subjectOf |
missing satellites problem
ⓘ
near-field cosmology studies ⓘ too-big-to-fail problem NERFINISHED ⓘ |
| typicalAbsoluteMagnitude | −8 to −14 in V band ⓘ |
| typicalHalfLightRadius | tens to thousands of parsecs ⓘ |
| typicalStellarMass | 10^3 to 10^9 solar masses ⓘ |
| usedFor |
constraining dark matter properties
ⓘ
probing chemical evolution at low metallicity ⓘ studying reionization effects on small galaxies ⓘ studying tidal interactions with massive galaxies ⓘ testing galaxy formation models ⓘ |
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Local Group outskirts
this entity surface form:
Local Group outskirts