Einasto density profile
E237665
The Einasto density profile is a mathematical model used in astrophysics to describe how the density of dark matter and stars varies smoothly with distance from the centers of galaxies and galaxy clusters.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Einasto density profile canonical | 1 |
| Einasto index | 1 |
| Sérsic profile | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2141586 — 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: Einasto density profile Context triple: [Jaan Einasto, notableConcept, Einasto density profile]
-
A.
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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B.
Galactic thin disk
The Galactic thin disk is the relatively flat, rotating component of the Milky Way where most of its young to middle-aged stars, gas, and spiral arms are concentrated.
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C.
Tolman surface brightness test
The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
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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.
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E.
Leo I Dwarf Galaxy
Leo I Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
- 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: Einasto density profile Target entity description: The Einasto density profile is a mathematical model used in astrophysics to describe how the density of dark matter and stars varies smoothly with distance from the centers of galaxies and galaxy clusters.
-
A.
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.
-
B.
Galactic thin disk
The Galactic thin disk is the relatively flat, rotating component of the Milky Way where most of its young to middle-aged stars, gas, and spiral arms are concentrated.
-
C.
Tolman surface brightness test
The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
-
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.
Leo I Dwarf Galaxy
Leo I Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical model
ⓘ
density profile ⓘ galactic structure model ⓘ |
| advantage | better fits to simulated dark matter halos than NFW in many cases ⓘ |
| appliesTo |
dark matter halos
ⓘ
galaxies ⓘ galaxy clusters ⓘ |
| assumes | spherical symmetry in simplest form ⓘ |
| canBeExtendedTo | axisymmetric systems ⓘ |
| characteristic |
curved logarithmic slope
ⓘ
smoothly varying density with radius ⓘ |
| comparedWith |
Burkert profile
ⓘ
Hernquist profile ⓘ Jaffe profile ⓘ |
| contrastWith |
Navarro–Frenk–White profile
ⓘ
isothermal sphere profile ⓘ |
| creator | Jaan Einasto ⓘ |
| dependsOn | radius ⓘ |
| describes | radial mass density distribution ⓘ |
| field |
astrophysics
ⓘ
cosmology ⓘ |
| generalizes | Sérsic profile ⓘ |
| hasParameter |
Einasto density profile
self-linksurface differs
ⓘ
surface form:
Einasto index
scale density ⓘ scale radius ⓘ shape parameter ⓘ |
| mathematicalForm | exponential of a power of radius ⓘ |
| namedAfter | Jaan Einasto ⓘ |
| originatedIn | 1970s ⓘ |
| property |
finite central density
ⓘ
non-power-law inner slope ⓘ |
| relatedConcept |
Sérsic index
ⓘ
dark matter halo profile ⓘ halo mass–concentration relation ⓘ |
| similarTo | Sérsic profile ⓘ |
| usedFor |
describing galaxy rotation curve mass models
ⓘ
fitting N-body simulation halos ⓘ modeling dark matter distribution ⓘ modeling stellar distribution ⓘ |
| usedIn |
analysis of halo concentration
ⓘ
cosmological N-body simulations ⓘ dynamical modeling of galaxies ⓘ strong lensing mass models ⓘ weak lensing mass models ⓘ |
| usedToInfer |
dark matter fraction in galaxies
ⓘ
total mass distribution from kinematics ⓘ |
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: Einasto density profile Description of subject: The Einasto density profile is a mathematical model used in astrophysics to describe how the density of dark matter and stars varies smoothly with distance from the centers of galaxies and galaxy clusters.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Sérsic profile
this entity surface form:
Einasto index