XSTBvarabs

class sherpa.astro.xspec.XSTBvarabs(name='tbvarabs')[source]

Bases: sherpa.astro.xspec.XSMultiplicativeModel

The XSPEC TBvarabs model: ISM grain absorption.

The model is described at [1].

nH

The equivalent hydrogen column (in units of 10^22 atoms/cm^2).

He, C, N, O, Ne, Na, Mg, Al, Si, S, Cl, Ar, Ca, Cr, Fe, Co, Ni

The abundance of the element in solar units.

H2
The equivalent molecular hydrogen column (in units of
10^22 atoms/cm^2).
rho

The grain density, in g/cm^3.

amin

The minimum grain size, in micro-meters.

amax

The maximum grain size, in micro-meters.

PL

The power-law index of grain sizes.

H_dep, He_dep, C_dep, N_dep, O_dep, Ne_dep, Na_dep, Mg_dep, Al_dep,
Si_dep, S_dep, Cl_dep, Ar_dep, Ca_dep, Cr_dep, Fe_dep, Co_dep, Ni_dep

The grain depletion fraction of the element.

redshift

The redshift of the absorber.

See also

XSTBabs, XSTBfeo, XSTBgas, XSTBgrain, XSTBpcf, XSTBrel, XSzTBabs

Notes

The set_xsabund function changes the relative abundances of the elements, in particular the “wilm” setting.

References

[1]https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelTbabs.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.
reset()
set_center(\*args, \*\*kwargs)
startup()
teardown()

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.

reset()
set_center(*args, **kwargs)
startup()
teardown()