Multiple blackbody disk model with zero-torque inner boundary. XSPEC model.
A multi-temperature blackbody model for a thin, steady-state, Newtonian accretion disk, assuming zero torque at the inner boundary for the disk at radius R_in. The temperature of the disk as a function of radius is assumed to be
T(r) = T_* r^(-3/4) (1-r^(-1/2))^(1/4) ,
where r = R/R_in and
T_* = f(3 G M Mdot / 8 pi R_in^3 sigma)^(1/4) .
The maximum temperature in the disk is given by
T_max = 0.488 T_* .
This model is an alternative to xsdiskbb, which assumes a non-zero torque at the inner edge and a temperature profile
T(r) = T_* r^(-3/4) ,
and it should be used to fit spectra of disks when the zero-torque inner boundary condition is appropriate. For details see Zimmerman et al. (2004) astro-ph/0408209.
This is an additive model component.
|1||t_max||maximum temperature in the disk (keV)|
|2||norm||(1/f^4) (R_in/D)^2 cos i, where R_in is the inner radius of the disk in km, D is the distance to the source in units of 10 kpc, i is the inclination, and f is the color to effective temperature ratio.|
This information is taken from the XSPEC User's Guide. Version 12.9.1n of the XSPEC models is supplied with CIAO 4.10.
For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.
To check the X-Spec version used by Sherpa, use the get_xsversion routine from the xspec module:
sherpa> from sherpa.astro.xspec import get_xsversion sherpa> get_xsversion() '12.9.1n'
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