Synopsis
The XSPEC vcph model: Cooling + heating model for cool core clusters
Syntax
xsvcph The xsvcph model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsvcph", "mdl")
>>> print(mdl)Create a component of the xsvcph model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.peakT thawed 2.2 0.1 100 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 0 50 mdl.switch frozen 2 0 3 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| peakT | The peak temperature, in keV. |
| He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni | The abundance of the element, with respect to Solar. |
| Redshift | The redshift. |
| 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, in solar mass per year. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelCph.html
Changes in CIAO
Changed in CIAO 4.17
The switch parameter default has changed from 1 to 2 to match XSPEC 12.14.0 and the maximum value is now 3.
Changed in CIAO 4.14
The default Redshift parameter value has changed from 0.1 to 0 to match XSPEC.
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.