Xspec Manual
User Manual:
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- Introduction
- Spectral Fitting and XSPEC
- XSPEC Overview and Helpful Hints
- Syntax
- How to return to the XSPEC12>prompt
- Getting Help
- Commands
- Issuing Commands
- Control Commands
- Query, chatter and shutting XSPEC up (somewhat)
- Scripts and the Save command
- Miscellaneous
- Data Commands
- Model Commands
- Fitting Commands
- Binning and Grouping data
- Plotting Commands
- Setting Commands
- Breaking With Ctrl-C
- Customizing XSPEC
- Customizing system-wide
- Walks through XSPEC
- Introduction
- Brief Discussion of XSPEC Files
- Fitting Models to Data: An Old Example from EXOSAT
- Simultaneous Fitting
- Multiple Models: a Background Modeling Example
- Using XSPEC to Simulate Data: an Example for Chandra
- Producing Plots: Modifying the Defaults
- Markov Chain Monte Carlo Example
- INTEGRAL/SPI: A Walk Through Example
- INTEGRAL Specific Command Line Scripts
- XSPEC Commands
- XSPEC Models
- Alphabetical Summary of Models
- Additive Model Components
- agauss, zagauss: gaussian line profile in wavelength space
- apec, vapec, vvapec: APEC emission spectrum
- atable: tabulated additive model
- bapec, bvapec, bvvapec: velocity broadened APEC thermal plasma model
- bbody, zbbody: blackbody
- bbodyrad: blackbody spectrum, area normalized
- bexrav: reflected e-folded broken power law, neutral medium
- bexriv: reflected e-folded broken power law, ionized medium
- bknpower: broken power law
- bkn2pow: broken power law, 2 break energies
- bmc: Comptonization by relativistic matter
- bremss, vbremss, zbremss: thermal bremsstrahlung
- btapec, bvtapec, bvvtapec: velocity broadened APEC emission spectrum with separate continuum and line temperatures
- c6mekl, c6vmekl, c6pmekl, c6pvmkl: differential emission measure using Chebyshev representations with multi-temperature mekal
- carbatm: Nonmagnetic carbon atmosphere of a neutron star
- cemekl, cevmkl: plasma emission, multi-temperature using mekal
- cflow: cooling flow
- compbb: Comptonization, black body
- compLS: Comptonization, Lamb & Sanford
- compmag: Thermal and bulk Comptonization for cylindrical accretion onto the polar cap of a magnetized neutron star
- compPS: Comptonization, Poutanen & Svenson
- compST: Comptonization, Sunyaev & Titarchuk
- comptb: Thermal and bulk Comptonization of a seed blackbody-like spectrum
- compTT: Comptonization, Titarchuk
- cplinear: a non-physical piecewise-linear model for low count background spectra.
- cutoffpl: power law, high energy exponential cutoff
- disk: accretion disk, black body
- diskbb: accretion disk, multi-black body components
- diskir: Irradiated inner and outer disk
- diskline: accretion disk line emission, relativistic
- diskm: accretion disk with gas pressure viscosity
- disko: accretion disk, inner, radiation pressure viscosity
- diskpbb: accretion disk, power-law dependence for T(r)
- diskpn: accretion disk, black hole, black body
- eplogpar: log-parabolic blazar model with F normalization
- Eqpair, eqtherm, compth: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.
- equil, vequil: collisional plasma, ionization equilibrium
- expdec: exponential decay
- ezdiskbb: multiple blackbody disk model with zero-torque inner boundary
- gadem, vgadem: plasma emission, multi-temperature with gaussian distribution of emission measure.
- gauss, zgauss: gaussian line profile
- gnei, vgnei, vvgnei: collisional plasma, non-equilibrium, temperature evolution
- grad: accretion disk, Schwarzschild black hole
- grbm: gamma-ray burst continuum
- hatm: Nonmagnetic hydrogen atmosphere of a neutron star
- kerrbb: multi-temperature blackbody model for thin accretion disk around a Kerr black hole
- kerrd: optically thick accretion disk around a Kerr black hole
- kerrdisk: accretion disk line emission with BH spin as free parameter
- laor: accretion disk, black hole emission line
- laor2: accretion disk with broken-power law emissivity profile, black hole emission line
- logpar: log-parabolic blazar model
- lorentz: lorentz line profile
- meka, vmeka: emission, hot diffuse gas (Mewe-Gronenschild)
- mekal, vmekal: emission, hot diffuse gas (Mewe-Gronenschild-Kaastra)
- mkcflow, vmcflow: cooling flow, mekal
- nei, vnei, vvnei: collisional plasma, non-equilibrium, constant temperature
- nlapec: continuum-only APEC emission spectrum
- npshock, vnpshock, vvnpshock: shocked plasma, plane parallel, separate ion, electron temperatures
- nsa: neutron star atmosphere
- nsagrav: NS H atmosphere model for different g
- nsatmos: NS Hydrogen Atmosphere model with electron 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: non-thermal pair plasma
- Nthcomp: Thermally comptonized continuum
- Optxagnf, optxagn: Colour temperature corrected disc and energetically coupled Comptonisation model for AGN.
- pegpwrlw: power law, pegged normalization
- pexmon: neutral Compton reflection with self-consistent Fe and Ni lines.
- pexrav: reflected powerlaw, neutral medium
- pexriv: reflected powerlaw, ionized medium
- plcabs: powerlaw observed through dense, cold matter
- posm: positronium continuum
- powerlaw, zpowerlw: power law photon spectrum
- pshock, vpshock, vvpshock: plane-parallel shocked plasma, constant temperature
- raymond, vraymond: emission, hot diffuse gas, Raymond-Smith
- redge: emission, recombination edge
- refsch: reflected power law from ionized accretion disk
- rnei, vrnei, vvrnei: non-equilibrium recombining collisional plasma
- sedov, vsedov, vvsedov: sedov model, separate ion, electron temperatures
- sirf: self-irradiated funnel
- slimbh: Stationary slim accretion disk
- smaug: optically-thin, spherically-symmetric thermal plasma.
- snapec: galaxy cluster spectrum using SN yields
- srcut: synchrotron spectrum, cutoff power law
- sresc: synchrotron spectrum, cut off by particle escape
- step: step function convolved with gaussian
- tapec, vtapec, vvtapec: APEC emission spectrum with separate continuum and line temperatures
- voigt: Voigt line profile
- Multiplicative Model Components
- absori: ionized absorber
- acisabs: Chandra ACIS q.e. decay
- cabs: Optically-thin Compton scattering.
- constant: energy-independent factor
- cyclabs: absorption line, cyclotron
- dust: dust scattering
- edge, zedge: absorption edge
- etable: exponential tabular model
- expabs: exponential roll-off at low E
- expfac: exponential modification
- gabs: gaussian absorption line
- heilin: Voigt absorption profiles for He I series
- highecut, zhighect: high-energy cutoff
- hrefl: reflection model
- ismabs: A high resolution ISM absorption model with variable columns for individual ions
- lyman: Voigt absorption profiles for H I or He II Lyman series
- mtable: multiplicative tabular model
- notch: absorption line, notch
- pcfabs, zpcfabs: partial covering fraction absorption
- phabs, vphabs, zphabs, zvphabs: photoelectric absorption
- plabs: power law absorption
- pwab: power-law distribution of neutral absorbers
- recorn: change correction norm for a spectrum
- redden: interstellar extinction
- smedge: smeared edge
- spexpcut: super-exponential cutoff absorption
- spline: spline modification
- SSSice: Einstein SSS ice absorption
- swind1: absorption by partially ionized material with large velocity shear
- tbabs, ztbabs, tbfeo, tbgas, tbgrain, tbpcf, tbvarabs, tbrel: ISM grain absorption
- uvred: interstellar extinction, Seaton Law
- varabs, zvarabs: photoelectric absorption
- wabs, zwabs: photoelectric absorption, Wisconsin cross-sections
- wndabs, zwndabs: photo-electric absorption, warm absorber
- xion: reflected spectrum of photo-ionized accretion disk/ring
- xscat: dust scattering
- zbabs: EUV ISM attenuation
- zdust: extinction by dust grains
- zigm: UV/Optical attenuation by the intergalactic medium
- zredden: redshifted version of redden
- zsmdust: extinction by dust grains in starburst galaxies
- zvfeabs: photoelectric absorption with free Fe edge energy
- zxipcf: partial covering absorption by partially ionized material
- Convolution Model Components
- cflux: calculate flux
- clumin: calculate luminosity
- cpflux: calculate photon flux
- gsmooth: gaussian smoothing
- ireflect: reflection from ionized material
- kdblur: convolve with the laor model shape
- kdblur2: convolve with the laor2 model shape
- kerrconv: accretion disk line shape with BH spin as free parameter
- lsmooth: lorentzian smoothing
- partcov: partial covering
- rdblur: convolve with the diskline model shape
- reflect: reflection from neutral material
- rfxconv: angle-dependent reflection from an ionized disk
- simpl: comptonization of a seed spectrum
- xilconv: angle-dependent reflection from an ionized disk
- vashift: velocity shift an additive model
- vmshift: velocity shift a multiplicative model
- zashift: redshift an additive model
- zmshift: redshift a multiplicative model
- Pile-Up Model Components
- Mixing Model Components
- The User Interface
- Statistics in XSPEC
- Adding Models to XSPEC
- Overview of PLT
- Associated Programs
- Using the XSPEC Models Library in Other Programs
- Adding a Custom Chain Proposal Algorithm
- Changes between v11 and v12
- Older Release Notes