Milky Way circumgalactic medium
E487063
The Milky Way circumgalactic medium is the vast, diffuse halo of gas surrounding our galaxy that acts as a reservoir for inflowing material and an interface between the Milky Way and the intergalactic environment.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Milky Way circumgalactic halo | 1 |
| Milky Way circumgalactic medium canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5007476 — 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 circumgalactic medium Context triple: [Magellanic Stream, feeds, Milky Way circumgalactic medium]
-
A.
Physics of the Interstellar and Intergalactic Medium
Physics of the Interstellar and Intergalactic Medium is a comprehensive graduate-level textbook that explains the physical processes governing gas, dust, radiation, and magnetic fields in the space between and among galaxies.
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B.
Milky Way 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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C.
Milky Way dark matter halo
The Milky Way dark matter halo is the vast, roughly spherical, invisible mass of dark matter surrounding our galaxy that dominates its gravitational potential and governs the motions of its stars, gas, and satellite galaxies.
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D.
Milky Way globular cluster system
The Milky Way globular cluster system is the population of ancient, densely packed star clusters that orbit the Milky Way’s halo and bulge, serving as key tracers of the galaxy’s formation and evolution.
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E.
Coming of Age in the Milky Way
Coming of Age in the Milky Way is a popular science book that traces the historical development of our understanding of the universe, blending astronomy, physics, and cultural history for a general audience.
- 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 circumgalactic medium Target entity description: The Milky Way circumgalactic medium is the vast, diffuse halo of gas surrounding our galaxy that acts as a reservoir for inflowing material and an interface between the Milky Way and the intergalactic environment.
-
A.
Physics of the Interstellar and Intergalactic Medium
Physics of the Interstellar and Intergalactic Medium is a comprehensive graduate-level textbook that explains the physical processes governing gas, dust, radiation, and magnetic fields in the space between and among galaxies.
-
B.
Milky Way 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.
-
C.
Milky Way dark matter halo
The Milky Way dark matter halo is the vast, roughly spherical, invisible mass of dark matter surrounding our galaxy that dominates its gravitational potential and governs the motions of its stars, gas, and satellite galaxies.
-
D.
Milky Way globular cluster system
The Milky Way globular cluster system is the population of ancient, densely packed star clusters that orbit the Milky Way’s halo and bulge, serving as key tracers of the galaxy’s formation and evolution.
-
E.
Coming of Age in the Milky Way
Coming of Age in the Milky Way is a popular science book that traces the historical development of our understanding of the universe, blending astronomy, physics, and cultural history for a general audience.
- F. None of above. chosen
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical structure
ⓘ
circumgalactic medium ⓘ gaseous halo ⓘ |
| actsAs | gas reservoir for the Milky Way ⓘ |
| baryonContent | contains a large fraction of the Milky Way’s missing baryons ⓘ |
| baryonPhase | diffuse gas outside the stellar disk but within the virial radius ⓘ |
| componentOf |
Milky Way halo
ⓘ
linked to:
Milky Way stellar halo
|
| contains |
high-velocity clouds
ⓘ
magnetized plasma ⓘ |
| density | very low number density compared to interstellar medium ⓘ |
| dominantPhaseTemperature | approximately 10^6 Kelvin ⓘ |
| extendsTo |
approximately 200 kiloparsecs from the Galactic center
ⓘ
approximately 300 kiloparsecs from the Galactic center ⓘ |
| hasComponent |
cool gas phase
ⓘ
hot gas phase ⓘ ionized gas ⓘ metals ⓘ neutral gas ⓘ warm gas phase ⓘ |
| hasUncertainty | mass and extent are uncertain and model-dependent ⓘ |
| influences |
chemical evolution of the Milky Way
ⓘ
evolution of the Milky Way galaxy ⓘ star formation history of the Milky Way ⓘ |
| interactsWith |
Local Group intergalactic medium
ⓘ
circumgalactic medium of Andromeda (M31) ⓘ |
| kinematics | contains both inflowing and outflowing gas ⓘ |
| locatedIn | Local Group ⓘ |
| massEstimate |
comparable to or exceeding the mass of stars in the Milky Way
ⓘ
on the order of 10^10 solar masses ⓘ |
| metallicity |
enriched by past star formation in the Milky Way
ⓘ
subsolar metallicity on average ⓘ |
| observedVia |
X-ray absorption lines
ⓘ
X-ray emission ⓘ quasar sightline spectroscopy ⓘ ultraviolet absorption lines ⓘ |
| partOf | Milky Way ⓘ |
| redshift | approximately 0 ⓘ |
| role |
interface between the Milky Way and the intergalactic medium
ⓘ
mediates gas accretion onto the Milky Way ⓘ receives outflows from Galactic center activity ⓘ receives outflows from stellar winds ⓘ receives outflows from supernova feedback ⓘ supplies inflowing material for star formation in the Milky Way disk ⓘ |
| spatialRelation |
envelops the Milky Way dark matter halo
ⓘ
envelops the Milky Way stellar disk ⓘ |
| subjectOf |
cosmological hydrodynamical simulations
ⓘ
observations with Chandra X-ray Observatory ⓘ observations with Hubble Space Telescope ⓘ observations with XMM-Newton ⓘ |
| surrounds |
Milky Way galaxy
ⓘ
linked to:
Milky Way
|
| temperatureRange | approximately 10^4 to 10^6 Kelvin ⓘ |
| tracedBy |
HI high-velocity clouds
ⓘ
OVI absorption ⓘ OVII absorption ⓘ OVIII absorption ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Milky Way circumgalactic medium Description of subject: The Milky Way circumgalactic medium is the vast, diffuse halo of gas surrounding our galaxy that acts as a reservoir for inflowing material and an interface between the Milky Way and the intergalactic environment.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Milky Way circumgalactic medium