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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

http://www.astro.yale.edu/coppi/eqpair/eqpap4.ps.

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:

 

par1

lh/ls, ratio of the hard to soft compactnesses

par2

lbb, the soft photon compactness

par3

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

par4

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

par5

tp, the Thomson scattering depth

par6

radius, the size of the scattering region (cm)

par7

gmin, minimum Lorentz factor of the pairs

par8

gmax, maximum Lorentz factor of the pairs

par9

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

par10

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

par11

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

par12

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

par13

Fe_abund, relative abundance of iron

par14

Ab>He, relative abundance of other metals

par15

Tdisk, temperature of reflecting disk

par16

x, ionization parameter of reflector

par17

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

par18

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

par19

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

par20

Redshift, z

norm

 

 

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