Antlia 2 Dwarf Galaxy
E507881
Antlia 2 Dwarf Galaxy is an extremely diffuse, low-surface-brightness satellite galaxy of the Milky Way, notable for its large size yet faint appearance and recent discovery through Gaia data.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
diffuse galaxy
ⓘ
dwarf galaxy ⓘ low-surface-brightness galaxy ⓘ |
| absoluteMagnitudeV | approximately −9 ⓘ |
| alternativeName | Antlia 2 NERFINISHED ⓘ |
| angularPosition | constellation Antlia ⓘ |
| announced | 2018 ⓘ |
| classification | ultra-diffuse-like dwarf galaxy ⓘ |
| darkMatterDominated | true ⓘ |
| discoveredUsing |
Gaia DR2 data
ⓘ
Gaia space observatory NERFINISHED ⓘ |
| discoveryMethod |
star counts in Gaia data
ⓘ
stellar proper motion analysis ⓘ |
| discoveryTeam | Torrealba et al. NERFINISHED ⓘ |
| discoveryYear | 2018 ⓘ |
| distanceFromEarth |
about 130 kiloparsecs
ⓘ
about 420,000 light-years ⓘ |
| distanceFromMilkyWayCenter | about 130 kiloparsecs ⓘ |
| galaxyType | dwarf spheroidal galaxy ⓘ |
| gasContent | gas-poor ⓘ |
| halfLightRadius |
about 2.9 kiloparsecs
ⓘ
about 9,500 light-years ⓘ |
| hasProperty |
extremely diffuse stellar distribution
ⓘ
very low central surface brightness ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| locatedIn | Local Group NERFINISHED ⓘ |
| locatedInConstellation | Antlia NERFINISHED ⓘ |
| luminosityComparison | much fainter than the Large Magellanic Cloud ⓘ |
| massToLightRatio | very high ⓘ |
| memberOf | Milky Way satellite system ⓘ |
| metallicity | low metallicity ⓘ |
| notableFor |
extremely low surface brightness
ⓘ
large physical size despite low luminosity ⓘ recent discovery via Gaia data ⓘ |
| observedWavelength |
near-infrared
ⓘ
optical ⓘ |
| orbitalStatus | bound satellite of the Milky Way ⓘ |
| publication | Torrealba et al. 2019 MNRAS paper NERFINISHED ⓘ |
| researchInterest |
constraints on Milky Way halo structure
ⓘ
tests of dark matter distribution in low-surface-brightness dwarfs ⓘ |
| satelliteOf | Milky Way NERFINISHED ⓘ |
| sizeComparison | comparable in size to the Large Magellanic Cloud ⓘ |
| starFormationActivity | quiescent ⓘ |
| stellarMass | of order 10^7 solar masses ⓘ |
| stellarPopulation | predominantly old stars ⓘ |
| surfaceBrightness |
extremely low
ⓘ
lower than typical dwarf spheroidal galaxies ⓘ |
| visibility | very faint ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.