xsvmcflow

Context: models

Synopsis

The XSPEC vmcflow model: cooling flow, mekal.

Syntax

xsvmcflow

The xsvmcflow model is an additive model component.

Description

The model is described at [1] . The results of this model depend on the cosmology settings set with set_xscosmo .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.lowT     thawed          0.1       0.0808         79.9        keV
   mdl.highT    thawed            4       0.0808         79.9        keV
   mdl.He       frozen            1            0         1000           
   mdl.C        frozen            1            0         1000           
   mdl.N        frozen            1            0         1000           
   mdl.O        frozen            1            0         1000           
   mdl.Ne       frozen            1            0         1000           
   mdl.Na       frozen            1            0         1000           
   mdl.Mg       frozen            1            0         1000           
   mdl.Al       frozen            1            0         1000           
   mdl.Si       frozen            1            0         1000           
   mdl.S        frozen            1            0         1000           
   mdl.Ar       frozen            1            0         1000           
   mdl.Ca       frozen            1            0         1000           
   mdl.Fe       frozen            1            0         1000           
   mdl.Ni       frozen            1            0         1000           
   mdl.Redshift frozen          0.1            0           10           
   mdl.switch   frozen            2            0            3           
   mdl.norm     thawed            1            0        1e+24

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
lowT	The minimum temperature, in keV.
highT	The maximum temperature, in keV.
He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni	The abundance relative to Solar.
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; if 3 then SPEX data (only usable with XSPEC 12.14.0 or later). See [1] for more details. This parameter can not be thawed.
norm	The mass accretion rate (solar mass per year).

References

[1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelMkcflow.html

Changes in CIAO

Changed in CIAO 4.17

The redshift parameter default has changed from 0 to 0.1 and for the switch parameter from 1 to 2 to match XSPEC 12.14.0 and the maximum value is now 3.

XSPEC version

CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.14.0k

Bugs

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