xspexriv

Context: models

Synopsis

Exponentially cutoff power law reflected from ionized matter. XSpec model.

Exponentially cutoff power law spectrum reflected from ionized material. See Magdziarz and Zdziarski (MNRAS, 273, 837; 1995) for details. Ionization and opacities of the reflecting medium are computed as in xsabsori. The output spectrum is the sum of an e-folded power law and the reflection component.

The reflection component alone can be obtained for relRefl < 0. Then the actual reflection normalization is |relRefl|. Note that you then need to change the limits of relRefl to exclude zero (as then the direct component appears). If foldE = 0 there is no cutoff in the power law.

The metal and iron abundance are variable with respect to those defined by the set_xsabund command.

The core of this model is a Greens' function integration with one numerical integral performed for each model energy. The numerical integration is done using an adaptive method which continues until a given estimated fractional precision is reached. The precision can be changed by setting PEXRIV_PRECISION, e.g., 'xset PEXRIV_PRECISION 0.05' (see 'ahelp set_xsxset'). The default precision is 0.01 (i.e., 1%).

This is an additive model component.

xspexriv Parameters

Number	Name	Description
1	phoindex	power law photon index, N_E prop. to E^(-PhoIndx)
2	folde	the e-folding energy in keV (if foldE=0, there is no cutoff; change the lower limit for that)
3	rel_refl	reflection scaling factor; if < 0, there is no direct component; relRefl=1 for isotropic source above disk
4	redshift	redshift, z
5	abund	abundance of elements heavier than He relative to that defined by set_xsabund
6	fe_abund	iron abundance relative to that defined by set_xsabund
7	cosincl	cosine of inclination angle
8	t_disk	disk temperature in K
9	xi	disk ionization parameter, xi = 4 pi F_ion/n, where F_ion is the 5 eV - 20 keV irradiating flux and n is the density of the reflector; see Done et al., 1992, ApJ, 395, 275
10	norm	photon flux at 1 keV (photons/keV/cm^2/s) of the power law only in the observed frame

XSpec version

This information is taken from the XSpec User's Guide. Version 12.7.1 of the XSpec models is supplied with CIAO 4.4.1.

Bugs

For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.