Helmi streams
E502431
Helmi streams are a group of stellar streams in the Milky Way’s halo formed from the remnants of a dwarf galaxy that was tidally disrupted and accreted by our Galaxy.
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
remnant of an accreted dwarf galaxy
ⓘ
stellar stream ⓘ substructure of the Milky Way halo ⓘ |
| componentOf | Milky Way Galaxy NERFINISHED ⓘ |
| hasAlternativeName | Helmi debris stream NERFINISHED ⓘ |
| hasChemicalAbundancePattern | alpha-enhanced stars ⓘ |
| hasDataSource |
Gaia mission astrometry
NERFINISHED
ⓘ
ground-based spectroscopic surveys ⓘ |
| hasDiscoverer | Amina Helmi NERFINISHED ⓘ |
| hasDiscoveryMethod | phase-space analysis of halo stars ⓘ |
| hasDiscoveryYear | 1999 ⓘ |
| hasDynamicalProperty |
evidence of past dwarf galaxy merger
ⓘ
kinematically distinct from in-situ halo stars ⓘ |
| hasFormationProcess |
galactic accretion event
ⓘ
hierarchical galaxy formation ⓘ tidal stripping ⓘ |
| hasKinematicProperty |
coherent motion in integrals-of-motion space
ⓘ
similar angular momentum among member stars ⓘ similar orbital energy among member stars ⓘ |
| hasMemberType | halo stars ⓘ |
| hasOrbitalRegion | inner stellar halo of the Milky Way ⓘ |
| hasOrigin | tidally disrupted dwarf galaxy ⓘ |
| hasStellarPopulation |
metal-poor stars
ⓘ
old stars ⓘ |
| locatedIn | Milky Way halo NERFINISHED ⓘ |
| partOf | substructure in the Galactic halo phase-space distribution ⓘ |
| traces | assembly history of the Milky Way halo ⓘ |
| usedFor |
constraining the Milky Way gravitational potential
ⓘ
studying chemical evolution of accreted systems ⓘ studying galaxy mergers ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.