A multi-temperature blackbody model for a thin, steady state, general relativistic accretion disk around a Kerr black hole. The effect of self-irradiation of the disk is considered, and the torque at the inner boundary of the disk is allowed to be non-zero. This model is intended as an extension to grad, which assumes that the black hole is non-rotating. For details see Li et al. (2005).
The redshift version zkerrbb has the mass accretion rate parameter in units of Solar masses per year and the distance parameter replaced by redshift.
Parameters for kerrbb:
par1 | eta, ratio of the disk power produced by a torque at the disk
inner boundary to the disk power arising from accretion. It must be
![]() ![]() |
par2 | specific angular momentum of the black hole in units of the
black hole mass M (geometrized units G=c=1). Should be ![]() |
par3 | disk's inclination angle (the angle between the axis of the
disk and the line of sight). It is expressed in degrees. i=0 is for a
"face-on" accretion disk. i should be ![]() |
par4 | the mass of the black hole in units of the solar mass. |
par5 | the “effective” mass accretion rate of the disk in units of
![]() ![]() |
par6 | the distance from the observer to the black hole in units of kpc. |
par7 | spectral hardening factor, T![]() ![]() |
par8 | a flag to switch on/off the effect of self-irradiation (never
allowed to be free). Self-irradiation is included when >
0. Self-irradiation is not included when ![]() |
par9 | a flag to switch on/off the effect of limb-darkening (never
allowed to be free). The disk emission is assumed to be limb-darkened
when >0. The disk emission is assumed to be isotropic when
lflag is ![]() |
K | normalization. Should be set to 1 if the inclination, mass and distance are frozen. |
Parameters for zkerrbb:
par1 | eta, ratio of the disk power produced by a torque at the disk
inner boundary to the disk power arising from accretion. It must be
![]() ![]() |
par2 | specific angular momentum of the black hole in units of the
black hole mass M (geometrized units G=c=1). Should be ![]() |
par3 | disk's inclination angle (the angle between the axis of the
disk and the line of sight). It is expressed in degrees. i=0 is for a
"face-on" accretion disk. i should be ![]() |
par4 | the mass of the black hole in units of the solar mass. |
par5 | the “effective” mass accretion rate of the disk in units of
![]() ![]() |
par6 | the redshift of the black hole. |
par7 | spectral hardening factor, T![]() ![]() |
par8 | a flag to switch on/off the effect of self-irradiation (never
allowed to be free). Self-irradiation is included when >
0. Self-irradiation is not included when ![]() |
par9 | a flag to switch on/off the effect of limb-darkening (never
allowed to be free). The disk emission is assumed to be limb-darkened
when >0. The disk emission is assumed to be isotropic when
lflag is ![]() |
K | normalization. Should be set to 1 if the inclination, mass and distance are frozen. |