Synopsis
Summary of Sherpa models (excluding XSPEC)
Description
The following table lists most of the models available within Sherpa. See "ahelp xs" for those models provided by XSPEC, and "ahelp tablemodel" and "ahelp load_user_model" for information on table and user-supplied models, respectively.
Sherpa models (exclding those from XSPEC)
Model name | Description |
---|---|
absorptionedge | Optical model of an absorption edge. |
absorptiongaussian | Gaussian function for modeling absorption (equivalent width). |
absorptionlorentz | Lorentz function for modeling absorption (equivalent width). |
absorptionvoigt | Voigt function for modeling absorption (equivalent width). |
accretiondisk | A model of emission due to an accretion disk. |
atten | Model the attenuation by the Inter-Stellar Medium (ISM). |
bbody | A one-dimensional Blackbody model. |
bbodyfreq | A one-dimensional Blackbody model (frequency). |
beta1d | One-dimensional beta model function. |
beta2d | Two-dimensional beta model function. |
blackbody | Emission from a black body. |
box1d | One-dimensional box function. |
box2d | Two-dimensional box function. |
bpl1d | One-dimensional broken power-law function. |
bremsstrahlung | Bremsstrahlung emission. |
brokenpowerlaw | Broken power-law model. |
ccm | Galactic extinction: the Cardelli, Clayton, and Mathis model. |
const1d | A constant model for one-dimensional data. |
const2d | A constant model for two-dimensional data. |
cos | One-dimensional cosine function. |
delta1d | One-dimensional delta function. |
delta2d | Two-dimensional delta function. |
dered | A de-reddening model. |
devaucouleurs2d | Two-dimensional de Vaucouleurs model. |
disk2d | Two-dimensional uniform disk model. |
edge | Photoabsorption edge model. |
emissiongaussian | Gaussian function for modeling emission. |
emissionlorentz | Lorentz function for modeling emission. |
emissionvoigt | Voigt function for modeling emission. |
erf | One-dimensional error function. |
erfc | One-dimensional complementary error function. |
exp | One-dimensional exponential function. |
exp10 | One-dimensional exponential function, base 10. |
fm | UV extinction curve: Fitzpatrick and Massa 1988. |
gauss1d | One-dimensional gaussian function. |
gauss2d | Two-dimensional gaussian function. |
hubblereynolds | Two-dimensional Hubble-Reynolds model. |
jdpileup | A CCD pileup model for the ACIS detectors on Chandra. |
linebroad | A one-dimensional line-broadening profile. |
lmc | LMC extinction: the Howarth model. |
log | One-dimensional natural logarithm function. |
log10 | One-dimensional logarithm function, base 10. |
logabsorption | Gaussian function for modeling absorption (log of fwhm). |
logemission | Gaussian function for modeling emission (log of fwhm). |
logparabola | One-dimensional log-parabolic function. |
lorentz1d | One-dimensional normalized Lorentz model function. |
lorentz2d | Two-dimensional un-normalised Lorentz function. |
normbeta1d | One-dimensional normalized beta model function. |
normgauss1d | One-dimensional normalised gaussian function. |
normgauss2d | Two-dimensional normalised gaussian function. |
opticalgaussian | Gaussian function for modeling absorption (optical depth). |
poisson | One-dimensional Poisson function. |
polynom1d | One-dimensional polynomial function of order 8. |
polynom2d | Two-dimensional polynomial function. |
polynomial | Polynomial model of order 5. |
powerlaw | Power-law model. |
powlaw1d | One-dimensional power-law function. |
recombination | Optically-thin recombination continuum model. |
scale1d | A constant model for one-dimensional data. |
scale2d | A constant model for two-dimensional data. |
schechter | One-dimensional Schecter model function. |
seaton | Galactic extinction: the Seaton model from Synphot. |
sersic2d | Two-dimensional Sersic model. |
shell2d | A homogenous spherical 3D shell projected onto 2D. |
sigmagauss2d | Two-dimensional gaussian function (varying sigma). |
sin | One-dimensional sine function. |
sm | Galactic extinction: the Savage & Mathis model. |
smc | SMC extinction: the Prevot et al. 1984 model. |
sqrt | One-dimensional square root function. |
stephi1d | One-dimensional step function. |
steplo1d | One-dimensional step function. |
tan | One-dimensional tan function. |
xgal | Extragalactic extinction: Calzetti, Kinney and Storchi-Bergmann |
Are models evaluated at a point or across a bin?
The integration of models in Sherpa is controlled by an integration flag in each model structure. Refer to "ahelp integrate" for information on integrating model components.
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.
See Also
- models
- list_model_components, list_models, load_xscflux, load_xsclumin, load_xscpflux, load_xsgsmooth, load_xsireflect, load_xskdblur, load_xskdblur2, load_xskerrconv, load_xslsmooth, load_xspartcov, load_xsrdblur, load_xsreflect, load_xsrfxconv, load_xsrgsxsrc, load_xssimpl, load_xsvashift, load_xsvmshift, load_xsxilconv, load_xszashift, load_xszmshift, tablemodel, xs, xsconvolve