next up previous contents
Next: Bknpower Up: Additive Model Components Previous: Bexrav

bexriv: reflected e-folded broken power law, ionized medium

Broken power-law spectrum multiplied by exponential high-energy cutoff, exp(-E/Ec), and reflected from ionized material. See Magdziarz & Zdziarski 1995, MNRAS, 273, 837 for details. Ionization and opacities of the reflecting medium is computed as in the absori model. The output spectrum is the sum of an e-folded broken power law and the reflection component. The reflection component alone can be obtained for . Then the actual reflection normalization is . Note that you need to change then the limits of  excluding zero (as then the direct component appears). If Ec = 0, there is no cutoff in the power law. The metal and iron abundances are variable with respect to those set by the command abund.

 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 BEXRIV_PRECISION eg xset BEXRIV_PRECISION 0.05. The default precision is 0.01 (ie 1%).

par1

, first power law photon index

par2

Ebreak, break energy (keV)

par3

, second power law photon index

par4

Ec, the e-folding energy in keV (if Ec = 0 there is no cutoff)

par5

relrefl, reflection scaling factor (1 for isotropic source above disk)

par6

redshift, z

par7

abundance of elements heavier than He relative to the solar abundances

par8

iron abundance relative to the above

par9

cosine of inclination angle

par10

disk temperature, K

par11

disk ionization parameter, , where Fion is the 5eV–20 keV irradiating flux, n is the density of the reflector; see Done et al., 1992, ApJ, 395, 275

norm

photon flux at 1 keV of the cutoff broken power-law only (no reflection) in the observed frame.

 

next up previous contents
Next: Bknpower Up: Additive Model Components Previous: Bexrav