XSkerrbb

class sherpa.astro.xspec.XSkerrbb(name='kerrbb')

Bases: sherpa.astro.xspec.XSAdditiveModel

The XSPEC kerrbb model: multi-temperature blackbody model for thin accretion disk around a Kerr black hole.

The model is described at [1].

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.

See also

XSgrad

References

[1]	(1, 2, 3, 4) https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKerrbb.html

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
version_enabled

Methods Summary

apply(outer, *otherargs, **otherkwargs)
calc(pars, xlo, *args, **kwargs)
get_center()
guess(dep, *args, **kwargs)	Set an initial guess for the parameter values.
regrid(*arrays)
reset()
set_center(*args, **kwargs)
startup()	Called before a model may be evaluated multiple times.
teardown()	Called after a model may be evaluated multiple times.

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

version_enabled = True

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(pars, xlo, *args, **kwargs)

get_center()

guess(dep, *args, **kwargs)

Set an initial guess for the parameter values.

Attempt to set the parameter values, and ranges, for the model to match the data values. This is intended as a rough guess, so it is expected that the model is only evaluated a small number of times, if at all.

regrid(*arrays)

reset()

set_center(*args, **kwargs)

startup()

Called before a model may be evaluated multiple times.

See also

teardown()

teardown()

Called after a model may be evaluated multiple times.

See also

setup()