Sérsic profile
E823176
The Sérsic profile is a mathematical model that describes how the intensity of light from a galaxy varies with distance from its center, widely used to characterize galaxy structure and morphology.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sérsic profile canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T9793679 — 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: Sérsic profile Context triple: [Einasto density profile, generalizes, Sérsic profile]
-
A.
Sérsic index
The Sérsic index is a parameter that characterizes how the intensity of light in a galaxy varies with radius, widely used to describe and classify galaxy surface brightness profiles.
-
B.
Navarro–Frenk–White profile
The Navarro–Frenk–White profile is a widely used mathematical model describing the characteristic density distribution of dark matter halos in cosmology and galaxy formation studies.
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C.
Einasto density profile
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.
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D.
Faber–Jackson relation
The Faber–Jackson relation is an empirical correlation in astronomy that links the luminosity of an elliptical galaxy to the velocity dispersion of its stars, providing a key tool for estimating galactic distances and masses.
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E.
Salpeter initial mass function
The Salpeter initial mass function is a foundational mathematical description in astrophysics that specifies how many stars of different masses form in a given stellar population, characterized by a power-law distribution favoring low-mass stars.
- 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: Sérsic profile Target entity description: The Sérsic profile is a mathematical model that describes how the intensity of light from a galaxy varies with distance from its center, widely used to characterize galaxy structure and morphology.
-
A.
Sérsic index
The Sérsic index is a parameter that characterizes how the intensity of light in a galaxy varies with radius, widely used to describe and classify galaxy surface brightness profiles.
-
B.
Navarro–Frenk–White profile
The Navarro–Frenk–White profile is a widely used mathematical model describing the characteristic density distribution of dark matter halos in cosmology and galaxy formation studies.
-
C.
Einasto density profile
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.
-
D.
Faber–Jackson relation
The Faber–Jackson relation is an empirical correlation in astronomy that links the luminosity of an elliptical galaxy to the velocity dispersion of its stars, providing a key tool for estimating galactic distances and masses.
-
E.
Salpeter initial mass function
The Salpeter initial mass function is a foundational mathematical description in astrophysics that specifies how many stars of different masses form in a given stellar population, characterized by a power-law distribution favoring low-mass stars.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
galaxy light profile
ⓘ
surface brightness profile model ⓘ |
| alsoKnownAs |
Sérsic law
NERFINISHED
ⓘ
r^{1/n} law ⓘ |
| appliesTo |
disk galaxies
ⓘ
elliptical galaxies ⓘ galactic bulges ⓘ galaxies ⓘ |
| characterizes |
light concentration of galaxies
ⓘ
shape of galaxy surface brightness profiles ⓘ |
| dependsOn |
Sérsic index n controlling profile curvature
ⓘ
effective radius Re setting scale ⓘ |
| describes | radial variation of galaxy surface brightness ⓘ |
| field |
astrophysics
ⓘ
extragalactic astronomy ⓘ galaxy morphology ⓘ |
| generalizes |
de Vaucouleurs profile
NERFINISHED
ⓘ
exponential disk profile ⓘ |
| hasParameter |
Sérsic index n
NERFINISHED
ⓘ
central surface brightness I0 ⓘ effective radius Re ⓘ effective surface brightness Ie ⓘ scale radius ⓘ shape parameter b_n ⓘ |
| hasProperty |
can fit a wide range of galaxy types
ⓘ
flexible shape controlled by index n ⓘ monotonically decreasing intensity with radius ⓘ |
| implementedIn |
GALFIT
NERFINISHED
ⓘ
GIM2D NERFINISHED ⓘ IMFIT NERFINISHED ⓘ |
| introducedIn | 1963 ⓘ |
| mathematicalForm | I(R) = I_e * exp{-b_n[(R/R_e)^{1/n} - 1]} ⓘ |
| namedAfter | José Luis Sérsic NERFINISHED ⓘ |
| publication | Atlas de Galaxias Australes NERFINISHED ⓘ |
| relatedTo |
Petrosian radius
NERFINISHED
ⓘ
galaxy concentration index ⓘ half-light radius ⓘ |
| specialCase |
de Vaucouleurs profile when n = 4
ⓘ
exponential profile when n = 1 ⓘ |
| usedFor |
bulge–disk decomposition
ⓘ
classifying galaxy morphology ⓘ fitting galaxy images ⓘ galaxy structural decomposition ⓘ measuring galaxy concentration ⓘ measuring galaxy sizes ⓘ |
| usedIn |
galaxy evolution studies
ⓘ
photometric analysis of galaxies ⓘ survey data analysis ⓘ |
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: Sérsic profile Description of subject: The Sérsic profile is a mathematical model that describes how the intensity of light from a galaxy varies with distance from its center, widely used to characterize galaxy structure and morphology.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.