Last modified: December 2018

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

xsdiskm

Context: models

Synopsis

The XSPEC diskm model: accretion disk with gas pressure viscosity.

Syntax

xsdiskm

The xsdiskm model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.accrate  thawed            1        0.001            9           
   mdl.NSmass   frozen          1.4          0.4           10       Msun
   mdl.Rinn     frozen         1.03         1.01         1.03           
   mdl.alpha    frozen            1         0.01           10           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

NSmass

The central mass, in solar mass units.

Rinn

The inner disk radius in gravitational units (three Schwarzschild radii).

alpha

The viscosity.

norm

The normalization of the model: see [1] for details.

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.

See Also

models
xsdisk, xsdisko