xsbcie

Context: models

Synopsis

The XSPEC bcie model: Emission spectrum from a plasma in Collisional-ionization equilibrium.

Syntax

xsbcie

The xsbcie 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("xsbcie", "mdl")
>>> print(mdl)

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.kT       thawed            1        0.008           64        keV
   mdl.Abundanc frozen            1            0            5           
   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.
Abundanc	The metal abundances (He fixed at that defined by the set_xsabund command). The elements included are C, N, O, Ne, Mg, Al, Si, S, Ar, Ca, Fe, and Ni. Relative abundances are set by set_xsabund ). 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

[1]

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.