Synopsis
The XSPEC ismabs model: A high resolution ISM absorption model with variable columns for individual ions.
Syntax
xsismabs The xsismabs model is a multiplicative model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsismabs", "mdl")
>>> print(mdl)Create a component of the xsismabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.H thawed 0.1 0 1e+06 10^22 mdl.HeII frozen 0 0 1e+06 10^16 mdl.CI thawed 33.1 0 1e+06 10^16 mdl.CII frozen 0 0 1e+06 10^16 mdl.CIII frozen 0 0 1e+06 10^16 mdl.NI thawed 8.32 0 1e+06 10^16 mdl.NII frozen 0 0 1e+06 10^16 mdl.NIII frozen 0 0 1e+06 10^16 mdl.OI thawed 67.6 0 1e+06 10^16 mdl.OII frozen 0 0 1e+06 10^16 mdl.OIII frozen 0 0 1e+06 10^16 mdl.NeI thawed 12 0 1e+06 10^16 mdl.NeII frozen 0 0 1e+06 10^16 mdl.NeIII frozen 0 0 1e+06 10^16 mdl.MgI thawed 3.8 0 1e+06 10^16 mdl.MgII frozen 0 0 1e+06 10^16 mdl.MgIII frozen 0 0 1e+06 10^16 mdl.Si_I thawed 3.35 0 1e+06 10^16 mdl.Si_II frozen 0 0 1e+06 10^16 mdl.Si_III frozen 0 0 1e+06 10^16 mdl.S_I thawed 2.14 0 1e+06 10^16 mdl.S_II frozen 0 0 1e+06 10^16 mdl.S_III frozen 0 0 1e+06 10^16 mdl.ArI thawed 0.25 0 1e+06 10^16 mdl.ArII frozen 0 0 1e+06 10^16 mdl.ArIII frozen 0 0 1e+06 10^16 mdl.CaI thawed 0.22 0 1e+06 10^16 mdl.CaII frozen 0 0 1e+06 10^16 mdl.CaIII frozen 0 0 1e+06 10^16 mdl.Fe thawed 3.16 0 1e+06 10^16 mdl.redshift frozen 0 -1 10
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| H | The equivalent hydrogen column (in units of 10^22 atoms/cm^2). |
| HeII, CI, CII, CIII, NI, NII, NIII, OI, OII, OIII, NeI, NeII, NeIII, MgI, MgII, MgIII, Si_I, Si_II, Si_III, S_I, S_II, S_III, ArI, ArII, ArIII, CaI, CaII, CaIII, Fe | The column for the species (in units of 10^16 atoms/cm^2). |
| redshift | The redshift of the absorber. |
Notes
As Sherpa parameter names are case insensitive the parameters for Silicon and Sulfur include an underscore character after the element name to avoid conflict: that is Si_I and S_I refer to the XSPEC SiI and SI parameters respectively.
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelIsmabs.html
XSPEC version
CIAO 4.15 comes with support for version 12.12.1c of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.12.1c
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.