Last modified: December 2018

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

xsmekal

Context: models

Synopsis

The XSPEC mekal model: emission, hot diffuse gas (Mewe-Kaastra-Liedahl).

Syntax

xsmekal

The xsmekal model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.kT       thawed            1       0.0808         79.9        keV
   mdl.nH       frozen            1        1e-05        1e+19       cm-3
   mdl.Abundanc frozen            1            0         1000           
   mdl.redshift frozen            0       -0.999           10           
   mdl.switch   frozen            1            0            2           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

kT

The temperature of the plasma, in keV.

nH

H density, in cm^-3.

Abundanc

The metal abundance of the plasma, as defined by the set_xsabund function.

redshift

The redshift of the plasma.

switch

If 0, the mekal code is run to evaluate the model; if 1 then interpolation of the mekal data is used; if 2 then interpolation of APEC data is used. See [1] for more details. This parameter can not be thawed.

norm

The normalization of the model: see [1] for an explanation of the units.

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.