next up previous contents
Next: Bexriv Up: Additive Model Components Previous: Bbodyrad

bexrav: reflected e-folded broken power law, neutral medium

A broken power-law spectrum multiplied by exponential high-energy cutoff, exp(-E/Ec), and reflected from neutral material. See Magdziarz & Zdziarski 1995, MNRAS, 273, 837 for details.

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 |relrefl|. 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 abundance are variable with respect to those set by the command abund. The opacities are those set by the command xsect. As expected in AGNs, H and He are assumed to be fully ionized.

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 BEXRAV_PRECISION eg xset BEXRAV_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

cosine of inclination angle

par7

abundance of elements heavier than He relative to the solar abundances

par8

iron abundance relative to the above

par9

redshift, z

norm

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

 

 

next up previous contents
Next: Bexriv Up: Additive Model Components Previous: Bbodyrad