next up previous contents
Next: Equil Up: Additive Model Components Previous: Eplogpar

Eqpair, eqtherm, compth: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.

These models are based on Paolo Coppi's hybrid thermal/non-thermal hot plasma emission model for X-ray binaries. The underlying physics and a detailed description of the code are included in the draft paper

Do not use these models without reading and understanding this paper. Simplified models eqtherm and compth are provided for cases where non-thermal processes are not important and photon-photon pair production can be ignored. These should only be used if lbb <~ 10.

The temperature of the thermal component of the electron distribution and the total electron optical depth (for both ionization electrons and electron-positron pairs) are written out if the chatter level is set to 15. This information is important for checking self-consistency.

In versions 1.10 and above the Compton reflection is done by a call to the ireflct model code and the relativistic blurring by a call to rdblur. This does introduce some changes in the spectrum from earlier versions. For the case of a neutral reflector (i.e. the ionization parameter is zero) more accurate opacities are calculated. For the case of an ionized reflector the old version assumed that for the purposes of calculating opacities the input spectrum was a power-law (with index based on the 2-10 keV spectrum). The new version uses the actual input spectrum, which is usually not a power law, giving different opacities for a given ionization parameter and disk temperature. The Greens' function integration required for the Compton reflection calculation is performed to an accuracy of  0.01 (i.e. 1%). This can be changed using e.g. xset EQPAIR_PRECISION 0.05.

The parameters for all three models are:



lh/ls, ratio of the hard to soft compactnesses


lbb, the soft photon compactness


kTbb, if > 0 then temperature of a blackbody; if < 0 then abs(kTbb) is the Tmax parameter for the diskpn model


lnt/lh, fraction of power supplied to energetic particles which goes into accelerating non-thermal particles


tp, the Thomson scattering depth


radius, the size of the scattering region (cm)


gmin, minimum Lorentz factor of the pairs


gmax, maximum Lorentz factor of the pairs


Ginj, if < 0 then non-thermal spectrum is assumed mono-energetic at gmax; if > 0 then a power-law from gmin to gmax


pairinj, if = 0 then accelerated particles are electrons from thermal pool; if = 1 then accelerated particles are electrons and positrons


cosIncl, inclination of reflecting material wrt line-of-sight


Refl, fraction of scattering region's emission intercepted by reflecting material


Fe_abund, relative abundance of iron


Ab>He, relative abundance of other metals


Tdisk, temperature of reflecting disk


x, ionization parameter of reflector


b, power-law index with radius of disk reflection emissivity


Rin, inner radius of reflecting material (GM/c2)


Rout, outer radius of reflecting material (GM/c2)


Redshift, z




next up previous contents
Next: Equil Up: Additive Model Components Previous: Eplogpar