Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/xssirf.html
AHELP for CIAO 4.11 Sherpa v1

xssirf

Context: models

Synopsis

The XSPEC sirf model: self-irradiated funnel.

Syntax

xssirf

The xssirf model is an additive model component.

Description

The model is described at [1] .


Example

>>> create_model_component("xssirf", "mdl")
>>> print(mdl)

Create a component of the xssirf model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.tin      thawed            1         0.01          100        keV
   mdl.rin      thawed         0.01        1e-05            1       rsph
   mdl.rout     thawed          100          0.1        1e+08       rsph
   mdl.theta    thawed         22.9            1           89        deg
   mdl.incl     frozen            0          -90           90        deg
   mdl.valpha   frozen         -0.5           -1            2           
   mdl.gamma    frozen        1.333          0.5           10           
   mdl.mdot     frozen         1000          0.5        1e+07           
   mdl.irrad    frozen            2            0           10           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

tin

The inner temperature (at the inner, inside-the-funnel photosphere), in keV.

rin

The inner (inner, inside-the-fulle photosphere) radius in "spherisation radius" units (see [1] for details).

rout

The outer photosphere radius in "spherisation radius" units

theta

The half-opening angle of the cone, in degrees.

incl

The inclination angle of the funnel, in degrees. Affects mainly self-occultation and relativistic boost effects.

valpha

The velocity law exponent.

gamma

The adiabatic index. It affects the inner, hotter parts of the flow, therefore we set is to 4/3 by default.

mdot

The mass ejection rate in Eddington (critical) units.

irrad

The number of iterations for irradiation.

norm

The normalization of the model.

References

XSPEC version

CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.0e

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.