AHELP for CIAO 4.15 Sherpa
The XSPEC kerrbb model: multi-temperature blackbody model for thin accretion disk around a Kerr black hole.
xskerrbb The xskerrbb model is an additive model component.
The model is described at  .
>>> create_model_component("xskerrbb", "mdl") >>> print(mdl)
Create a component of the xskerrbb model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.eta frozen 0 0 1 mdl.a thawed 0 -1 0.9999 mdl.i frozen 30 0 85 deg mdl.Mbh thawed 1 0 100 Msun mdl.Mdd thawed 1 0 1000 Mdd0 mdl.Dbh frozen 10 0 10000 kpc mdl.hd frozen 1.7 1 10 mdl.rflag frozen 1 -3.40282e+38 3.40282e+38 mdl.lflag frozen 0 -3.40282e+38 3.40282e+38 mdl.norm thawed 1 0 1e+24
The attributes for this object are:
|eta||The ratio of the disk power produced by a torque at the disk inner boundary to the disk power arising from accretion. See  for more details.|
|a||The specific angular momentum of the black hole in units of the black hole mass M (when G=c=1). It should be in the range [-1, 1).|
|i||The disk inclination angle, in degrees. A face-on disk has i=0. It must be less than or equal to 85 degrees.|
|Mbh||The mass of the black hole, in solar masses.|
|Mdd||The "effective" mass accretion rate in units of 10^18 g/s. See  for more details.|
|Dbh||The distance from the observer to the black hole, in units of kpc.|
|hd||The spectral hardening factor, Tcol/Teff. See  for more details.|
|rflag||A flag to switch on or off the effect of self irradiation: when greater than zero the self irradition is included, otherwise it is not. This parameter can not be thawed.|
|lflag||A flag to switch on or off the effect of limb darkening: when greater than zero the disk emission is assumed to be limb darkened, otherwise it is isotropic. This parameter can not be thawed.|
|norm||The normalization of the model. It should be fixed to 1 if the inclination, mass, and distance are frozen.|
-  https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKerrbb.html
CIAO 4.15 comes with support for version 12.12.1c of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.12.1c
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.