Abell 400
E562872
Abell 400 is a galaxy cluster notable for hosting the radio galaxy 3C 75, whose dual supermassive black holes are observed in the process of merging.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Abell 400 canonical | 1 |
| Abell Cluster 400 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5846080 — 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: Abell 400 Context triple: [Perseus–Pisces Supercluster, contains, Abell 400]
-
A.
Abell 426
Abell 426, also known as the Perseus Cluster, is a massive, nearby galaxy cluster notable for its bright X-ray emission and central active galaxy NGC 1275.
-
B.
Abell 539
Abell 539 is a rich galaxy cluster located within the Perseus–Pisces Supercluster and studied as part of large-scale structure in the universe.
-
C.
Abell 347
Abell 347 is a rich galaxy cluster located in the constellation Andromeda and is part of the large-scale Perseus–Pisces filamentary structure in the nearby universe.
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D.
Abell 3627
Abell 3627 is a massive, nearby galaxy cluster located in the direction of the Great Attractor region and is one of the most prominent components of the Hydra–Centaurus Supercluster.
-
E.
Abell 1060
Abell 1060 is a nearby, rich galaxy cluster in the constellation Hydra, notable for its dense concentration of galaxies and role in studies of large-scale cosmic structure.
- 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: Abell 400 Target entity description: Abell 400 is a galaxy cluster notable for hosting the radio galaxy 3C 75, whose dual supermassive black holes are observed in the process of merging.
-
A.
Abell 426
Abell 426, also known as the Perseus Cluster, is a massive, nearby galaxy cluster notable for its bright X-ray emission and central active galaxy NGC 1275.
-
B.
Abell 539
Abell 539 is a rich galaxy cluster located within the Perseus–Pisces Supercluster and studied as part of large-scale structure in the universe.
-
C.
Abell 347
Abell 347 is a rich galaxy cluster located in the constellation Andromeda and is part of the large-scale Perseus–Pisces filamentary structure in the nearby universe.
-
D.
Abell 3562
Abell 3562 is a massive galaxy cluster located within the Shapley Supercluster, one of the most densely populated regions of galaxy clusters in the nearby universe.
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E.
Abell 3627
Abell 3627 is a massive, nearby galaxy cluster located in the direction of the Great Attractor region and is one of the most prominent components of the Hydra–Centaurus Supercluster.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
Abell galaxy cluster
ⓘ
galaxy cluster ⓘ |
| catalogCode | A400 ⓘ |
| cataloguedIn |
Abell 1958 cluster catalogue
ⓘ
linked to:
Abell catalog of rich clusters of galaxies
|
| contains |
dual supermassive black holes of 3C 75
ⓘ
radio galaxy 3C 75 ⓘ |
| discoveredBy | George O. Abell ⓘ |
| distanceFromEarth | approximately 300 million light-years ⓘ |
| environment | cluster of galaxies with intracluster medium ⓘ |
| hasAlternativeName |
ACO 400
ⓘ
Abell Cluster 400 ⓘ
linked to:
Abell 400
|
| hasMember |
elliptical galaxies
ⓘ
radio galaxies ⓘ |
| hasNotableFeature | merging supermassive black holes in 3C 75 ⓘ |
| hasPhysicalProcess |
black hole merger in 3C 75
ⓘ
galaxy interactions ⓘ |
| hasRadioSource |
3C 75
ⓘ
linked to:
3C
|
| hasXrayEmission | intracluster gas ⓘ |
| isExampleOf | cluster hosting merging supermassive black holes ⓘ |
| locatedIn | constellation Cetus ⓘ |
| observedBy |
Chandra X-ray Observatory
ⓘ
Very Large Array ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
radio wavelengths ⓘ |
| partOf |
Abell catalogue of rich clusters of galaxies
ⓘ
linked to:
Abell catalog of rich clusters of galaxies
|
| redshift | approximately 0.024 ⓘ |
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: Abell 400 Description of subject: Abell 400 is a galaxy cluster notable for hosting the radio galaxy 3C 75, whose dual supermassive black holes are observed in the process of merging.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Abell 400