XSPEC V12 Models

Alphabetical Summary of Models

Model	Description
absori	Ionized absorber.
acisabs	Extra absorption due to contamination on the ACIS filters.
agauss, zagauss	Gaussian line profile in wavelength space.
ascac	ASCA PSF mixing model.
apec, vapec, vvapec	APEC thermal plasma model.
atable	Additive table model.
bapec, bvapec, bvvapec	Velocity broadened APEC thermal plasma model.
bbody, zbbody	Blackbody spectrum, with redshift variant
bbodyrad	Blackbody spectrum with norm proportional to surface area.
bexrav	E-folded broken power-law reflected from neutral matter
bexriv	E-folded broken power-law reflected from ionized matter
bknpower	Broken powerlaw.
bkn2pow	Three-segment broken powerlaw.
bmc	Comptonization by relativistically moving matter.
bremss, vbremss, zbremss	Thermal bremsstrahlung, with redshift variant.
c6mekl, c6pmkl, c6vmkl, c6vpmkl	6th-order Chebyshev polynomial DEM using mekal and variants
cabs	Compton scattering (non-relativistic)
cemekl, cevmkl	Multi-temperature mekal.
cflow	Cooling flow model.
cflux	Calculate flux of other model components.
compbb	Comptonized blackbody spectrum after Nishimura et al. 1986.
compLS	Comptonization spectrum after Lamb and Sanford 1979.
compmag	Thermal and bulk Comptonization for cylindrical accretion onto the polar cap of a magnetized neutron star.
compPS	Comptonization spectrum after Poutanen and Svenson 1986.
compST	Comptonization spectrum after Sunyaev and Titarchuk 1980.
comptb	Thermal and bulk Comptonization of a seed blackbody-like spectrum.
compTT	Comptonization spectrum after Titarchuk 1994.
constant	Energy-independent multiplicative factor.
cpflux	Convolution model to calculate photon flux.
cplinear	Non-physical model for low count background spectra.
cutoffpl	Powerlaw with high energy exponential rolloff.
cyclabs	Cyclotron absorption line.
disk	Disk model.
diskbb	Multiple blackbody disk model.
diskir	Irradiated inner and outer disk.
diskline	Line emission from relativistic accretion disk.
diskm	Disk model with gas pressure viscosity.
disko	Modified blackbody disk model.
diskpbb	Accretion disk with power-law T(r).
diskpn	Accretion disk around a black hole.
dust	Dust scattering out of the beam.
edge, zedge	Absorption edge.
eplogpar	Log-parabolic blazar model with vFv normalization.
eqpair, eqtherm, compth	Paolo Coppi's hybrid hot plasma emission models.
equil, vequil	Equilibrium ionization collisional plasma model from Borkowski.
etable	Table model for exponential of -1 times the input.
expabs	Low-energy exponential rolloff.
expdec	Exponential decay
expfac	Exponential factor.
ezdiskbb	Multiple blackbody disk model with zero-torque inner boundary.
gabs	Gaussian absorption line.
gadem, vgadem	Plasma emission, multi-temperature with gaussian distribution of emission measure.
gaussian, zgauss	Simple gaussian line profile.
gnei, vgnei	Generalized single ionization NEI plasma model.
grad	GR accretion disk around a black hole.
grbm	Gamma-ray burst model.
gsmooth	Gaussian smoothing with an energy dependent sigma.
heilin	Voigt absorption profiles for He I series.
highecut, zhighect	High energy cutoff.
hrefl	Simple reflection model good up to 15 keV.
ireflect	Reflection from ionized material.
kdblur	Convolve with the Laor model shape.
kdblur2	Convolve with the Laor2 model shape.
kerrbb	Multi-temperature blackbody model for thin accretion disk around a Kerr black hole.
kerrconv	Accretion disk line shape with BH spin as a free parameter.
kerrd	Optically thick accretion disk around a Kerr black hole.
kerrdisk	Accretion disk line emission with BH spin as free parameter.
laor	Line from accretion disk around a black hole.
laor2	Line from accretion disk with broken power-law emissivity around a black hole.
logpar	Log-parabolic blazar model.
lorentz	Lorentzian line profile.
lsmooth	Lorentzian smoothing with an energy dependent sigma.
lyman	Voigt absorption profiles for H I or He II Lyman series.
meka, vmeka	Mewe-Gronenschild-Kaastra thermal plasma (1992).
mekal, vmekal	Mewe-Kaastra-Liedahl thermal plasma (1995).
mkcflow, vmcflow	Cooling flow model based on mekal.
mtable	Multiplicative table model.
nei, vnei	Simple nonequilibrium ionization plasma model.
notch	Notch line absorption.
npshock, vnpshock	Plane-parallel shock with ion and electron temperatures.
nsa	Neutron star with hydrogen atmosphere
nsagrav	Neutron star with hydrogen atmosphere for different g
nsatmos	Neutron star H atmosphere with e- conduction and self-irradiation.
nsmax	Neutron star magnetic atmosphere.
nsmaxg	Neutron star with a magnetic atmosphere.
nsx	Neutron star with a non-magnetic atmosphere.
nteea	Pair plasma model.
nthcomp	Thermally comptonized continuum.
optxagn, optxagnf	Colour temperature corrected disc and energetically coupled Comptonisation model for AGN.
partcov	Convert absorption model into a partial covering absorption.
pwab	Power-law distribution of neutral absorbers.
pcfabs, zpcfabs	Partial covering fraction absorption.
pegpwlw	Powerlaw with pegged normalization.
pexmon	Neutral Compton reflection with self-consistent Fe and Ni lines.
pexrav	Exponentially cut-off power-law reflected from neutral matter.
pexriv	Exponentially cut-off power-law reflected from ionized matter.
phabs, vphabs, zphabs, zvphabs	Photo-electric absorption
pileup	CCD pile-up model for Chandra
plabs	Absorption model with power-law dependence on energy.
plcabs	Cut-off powerlaw observed through dense, cold matter.
posm	Positronium continuum.
powerlaw, zpowerlw	Simple photon power law.
projct	3-D to 2-D projection mixing model.
pshock, vpshock	Constant temperature, plane-parallel shock plasma model.
pwab	Power-law distribution of neutral absorbers.
raymond, vraymond	Raymond-Smith thermal plasma.
rdblur	Convolve with the diskline model shape.
recorn	Change correction norm for a spectrum (replaces old recornrm command).
redden	IR/optical/UV extinction from Cardelli et al. (1989)
redge	Recombination edge.
reflect	reflection from neutral matter
refsch	E-folded power-law reflected from an ionized relativistic disk.
rnei, vrnei, vvrnei	Non-equilibrium recombining collisional plasma.
sedov, vsedov	Sedov model with electron and ion temperatures.
simpl	Comptonization of a seed spectrum.
sirf	Multi-blackbody self-irradiated funnel model.
smaug	Model for an optically-thin, spherically-symmetric thermal plasma.
smedge	Smoothed absorption edge.
spexpcut	Super-exponential cutoff absorption.
spline	Spline multiplicative factor.
srcut	Synchrotron radiation from cut-off electron distribution.
sresc	Synchrotron radiation from escape-limited electron distribution.
SSSice	Einstein Observatory SSS ice absorption.
step	Step function convolved with gaussian.
suzpsf	Suzaku PSF mixing model
swind1	Absorption by partially ionized material with large velocity shear.
tbabs, ztbabs, tbgrain, tbvarabs	Absorption due to the ISM including molecules and grains.
uvred	UV reddening.
varabs, zvarabs	Photoelectric absorption with variable abundances.
wabs, zwabs	Photoelectric absorption (Morrison & McCammon).
wndabs, zwndabs	Photoelectric absorption with low energy window.
xion	The reflected spectrum from a photo-ionized accretion disk.
xmmpsf	XMM PSF model
zashift	Redshift an additive model.
zbabs	EUV ISM attenuation.
zdust	Extinction by dust grains (Pei, 1992).
zigm	UV/Optical attenuation by the intergalactic medium.
zmshift	Redshift a multiplicative model.
zredden	Redshifted IR/optical/UV extinction from Cardelli et al. (1989)
zsmdust	Extinction by dust grains in starburst galaxies.
zvfeabs	Redshifted absorption with variable iron abundance.
zxipcf	Partial covering absorption by partially ionized material.