Milky Way–Sagittarius dwarf interaction system
E505339
The Milky Way–Sagittarius dwarf interaction system is the ongoing gravitational encounter between our Galaxy and the Sagittarius Dwarf Spheroidal Galaxy, which is being tidally disrupted and absorbed, leaving streams of stars and clusters throughout the Milky Way halo.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
galactic interaction system
ⓘ
minor merger ⓘ |
| affectsComponent |
Milky Way dark matter halo
NERFINISHED
ⓘ
Milky Way outer disk NERFINISHED ⓘ Milky Way stellar halo NERFINISHED ⓘ |
| consequence |
accretion of dark matter onto Milky Way halo
ⓘ
accretion of stars onto Milky Way halo ⓘ mass loss from Sagittarius Dwarf Spheroidal Galaxy ⓘ perturbations in Milky Way disk ⓘ |
| distanceScale | tens of kiloparsecs ⓘ |
| drivingForce |
Milky Way tidal field
NERFINISHED
ⓘ
gravitational interaction ⓘ |
| environment | Local Group NERFINISHED ⓘ |
| includesCluster |
globular cluster Arp 2
NERFINISHED
ⓘ
globular cluster M54 NERFINISHED ⓘ globular cluster Terzan 7 NERFINISHED ⓘ globular cluster Terzan 8 NERFINISHED ⓘ |
| interactionType |
accretion event
ⓘ
satellite disruption ⓘ tidal interaction ⓘ |
| involvesGalaxy |
Milky Way
NERFINISHED
ⓘ
Sagittarius Dwarf Spheroidal Galaxy NERFINISHED ⓘ |
| location | Milky Way halo NERFINISHED ⓘ |
| observedAs |
Sagittarius stream
NERFINISHED
ⓘ
leading tidal arm ⓘ trailing tidal arm ⓘ |
| process |
dynamical friction
ⓘ
orbital decay ⓘ stellar stream formation ⓘ tidal stripping ⓘ |
| produces |
phase-space substructure in the halo
ⓘ
streams of globular clusters ⓘ streams of stars ⓘ |
| result |
Sagittarius stellar streams
NERFINISHED
ⓘ
Sagittarius tidal tails ⓘ disruption of Sagittarius Dwarf Spheroidal Galaxy ⓘ |
| roleInGalaxyEvolution |
builds up Milky Way stellar halo
ⓘ
example of hierarchical galaxy formation ⓘ |
| status | ongoing ⓘ |
| timeScale | several gigayears ⓘ |
| tracedBy |
M-giant stars
ⓘ
RR Lyrae variables NERFINISHED ⓘ blue horizontal branch stars ⓘ |
| usedFor |
constraining Milky Way gravitational potential
ⓘ
studying tidal disruption of dwarf galaxies ⓘ testing models of dark matter distribution in the Milky Way ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.