Milky Way stellar halo

E117419

component of the Milky Way galactic stellar halo

The Milky Way stellar halo is a vast, diffuse, roughly spherical population of old, metal-poor stars and dark matter that surrounds the Milky Way’s disk and bulge, extending far into its outer regions.

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All labels observed (10)

Label	Occurrences
Milky Way halo	59
Galactic halo	11
Milky Way stellar halo canonical	6
Milky Way outer halo	2
Gaia-Sausage-Enceladus remnant	1
Milky Way halo region	1
Milky Way halo structure	1
Milky Way halo system	1
Milky Way outer halo system	1
Milky Way stellar halo substructure	1

How this entity was disambiguated

This entity first appeared as the object of triple T992661 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Milky Way stellar halo
Context triple: [Sagittarius Dwarf Spheroidal Galaxy, galacticComponent, Milky Way stellar halo]

A. Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
B. Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
C. Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
D. Leo II Dwarf Galaxy
Leo II Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
E. Milky Way center
The Milky Way center is the dense, energetic core of our galaxy, hosting a supermassive black hole surrounded by stars, gas, and dust.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Milky Way stellar halo
Target entity description: The Milky Way stellar halo is a vast, diffuse, roughly spherical population of old, metal-poor stars and dark matter that surrounds the Milky Way’s disk and bulge, extending far into its outer regions.

A. Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
B. Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
C. Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
D. Leo II Dwarf Galaxy
Leo II Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
E. Milky Way center
The Milky Way center is the dense, energetic core of our galaxy, hosting a supermassive black hole surrounded by stars, gas, and dust.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	component of the Milky Way ⓘ galactic stellar halo ⓘ
contains	RR Lyrae variables ⓘ blue horizontal branch stars ⓘ carbon-enhanced metal-poor stars ⓘ field halo stars ⓘ globular clusters ⓘ stellar streams ⓘ tidal debris from accreted galaxies ⓘ ultra-faint dwarf galaxies ⓘ
darkMatterMass	dominant mass component ⓘ
extendsInto	outer regions of the Milky Way ⓘ
formedBy	hierarchical accretion of dwarf galaxies ⓘ in-situ star formation in early Milky Way ⓘ
hasChemicalAbundances	enhanced α-elements at low metallicity ⓘ
hasComponent	dark matter ⓘ inner halo ⓘ metal-poor stars ⓘ old stars ⓘ outer halo ⓘ
hasExtent	tens of kiloparsecs ⓘ
hasKinematics	high velocity dispersion ⓘ low net rotation ⓘ
hasMeanMetallicity	[Fe/H] ≲ −1 ⓘ
hasMetallicity	low metallicity ⓘ
hasOrbitalAnisotropy	radially biased orbits ⓘ
hasShape	roughly spherical ⓘ
hasStellarPopulation	Population II stars ⓘ
hasSubstructure	GD-1 stream ⓘ Gaia-Sausage-Enceladus remnant ⓘ linked to: Milky Way stellar halo Helmi streams ⓘ Monoceros Ring ⓘ Orphan stream ⓘ Sagittarius stream ⓘ linked to: Sagittarius Stream Virgo Overdensity ⓘ
innerHaloRadius	≲ 15–20 kiloparsecs ⓘ
isEnvironmentOf	Magellanic Clouds orbits ⓘ Milky Way satellite galaxies ⓘ linked to: Milky Way subgroup
outerExtent	≈ 100 kiloparsecs or more ⓘ
outerHaloRadius	≳ 20 kiloparsecs ⓘ
partOf	Milky Way ⓘ
stellarMass	≈ 10^9 solar masses ⓘ
studiedWith	Gaia mission ⓘ linked to: Gaia observatory Sloan Digital Sky Survey ⓘ
surrounds	Milky Way bulge ⓘ linked to: Milky Way center Milky Way disk ⓘ linked to: Galactic thin disk
traces	Milky Way dark matter halo ⓘ Milky Way mass distribution ⓘ
typicalStellarAge	> 10 billion years ⓘ

How these facts were elicited

Referenced by (84)

Full triples — surface form annotated when it differs from this entity's canonical label.

Sagittarius Dwarf Spheroidal Galaxy → galacticComponent → Milky Way stellar halo ⓘ

M13 → locatedIn → Galactic halo ⓘ

subject linked to: globular star cluster M13