Synopsis
The XSPEC kerrbb model: multi-temperature blackbody model for thin accretion disk around a Kerr black hole.
Syntax
xskerrbb The xskerrbb model is an additive model component.
Description
The model is described at [1] .
Example
>>> 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 -100 100 mdl.lflag frozen 0 -100 100 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
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 [1] 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 [0, 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 [1] 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 [1] 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.
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKerrbb.html
XSPEC version
CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.10.0e
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.