Synopsis
The XSPEC bvcie model: Emission spectrum from a plasma in Collisional-ionization equilibrium.
Syntax
xsbvcie The xsbvcie model is an additive model component.
Description
The model is described at [1] . Note that set_xsxset should be used to change the XSET settings.
Example
>>> create_model_component("xsbvcie", "mdl")
>>> print(mdl)Create a component of the xsbvcie model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kT thawed 6.5 0.0808 68.447 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.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 -0.999 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 |
|---|---|
| kT | The plasma temperature in keV. |
| He | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| C | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| N | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| O | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Ne | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Na | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Mg | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Al | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Si | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| S | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Ar | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Ca | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Fe | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Ni | The abundance relative to Solar. The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| 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 normalization of the model. See [1] for more details. |
References
Changes in CIAO
Added in CIAO 4.17
XSPEC version
CIAO 4.18 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.