Synopsis
The XSPEC zkerrbb model: multi-temperature blackbody model for thin accretion disk around a Kerr black hole.
Syntax
xszkerrbb The xszkerrbb model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xszkerrbb", "mdl") >>> print(mdl)
Create a component of the xszkerrbb 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 0.5 -0.99 0.9999 mdl.i frozen 30 0 85 deg mdl.Mbh thawed 1e+07 3 1e+10 M_sun mdl.Mdd thawed 1 1e-05 100000 M0yr mdl.z frozen 0.01 0 10 mdl.fcol frozen 2 -100 100 mdl.rflag frozen 1 -3.40282e+38 3.40282e+38 mdl.lflag frozen 1 -3.40282e+38 3.40282e+38 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
Attribute | Definition |
---|---|
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 [-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 M_solar/year. See [1] for more details. |
z | The redshift of the black hole |
fcol | 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
Changes in CIAO
New in CIAO 4.14
The xszkerrbb model (added in XSPEC 12.11.0) is new in CIAO 4.14.
XSPEC version
CIAO 4.14 comes with support for version 12.12.0 of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.12.0
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.
See Also
- models
- xskerrbb