xsbvcoolflow

Context: models

Synopsis

The XSPEC bvcoolflow model: cooling flow, mekal.

Syntax

xsbvcoolflow

The xsbvcoolflow model is an additive model component.

Description

The model is described at [1] .

Example

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

Create a component of the xsbvcoolflow 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.Velocity frozen            0            0        10000       km/s
   mdl.switch   frozen            2            0            3           
   mdl.norm     thawed            1            0        1e+24

PARAMETERS

The parameters for this function are:

Parameter	Definition
lowT	The low temperature in keV.
highT	The high temperature in keV.
He	The abundance relative to Solar.
C	The abundance relative to Solar.
N	The abundance relative to Solar.
O	The abundance relative to Solar.
Ne	The abundance relative to Solar.
Na	The abundance relative to Solar.
Mg	The abundance relative to Solar.
Al	The abundance relative to Solar.
Si	The abundance relative to Solar.
S	The abundance relative to Solar.
Ar	The abundance relative to Solar.
Ca	The abundance relative to Solar.
Fe	The abundance relative to Solar.
Ni	The abundance relative to Solar.
Redshift	The redshift of the plasma.
Velocity	The gaussian sigma for the velocity broadening (in km/s) which is only used when switch > 1.
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. 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/XSmodelCoolflow.html

Changes in CIAO

Added in CIAO 4.17

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.