Last modified: December 2020

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/xsdiskm.html
AHELP for CIAO 4.13 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:

Attribute Definition
accrate The accretion rate, in Eddington luminosities.
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 4.13 comes with support for version 12.10.1s of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.1s

Bugs

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

See Also

models
xsdisk, xsdisko