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.
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 ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.