set_xsxsect

Context: modeling

Synopsis

Set the cross sections used by X-Spec models.

Syntax

set_xsxsect(name: str)

No return value.

Description

Set the X-Spec photoelectric absorption cross-sections setting, which changes the cross-sections used by all X-Spec absorption models except for `XSwabs` . It is equivalent to the X-Spec xsect command [1] .

Example

>>> set_xsxsect('vern')
 Cross Section Table set to vern:  Verner, Ferland, Korista, and Yakovlev 1996

PARAMETERS

The parameter for this function is:

Parameter	Type information	Definition
name	{ 'bcmc', 'obcm', 'vern' }	The options are: 'bcmc' from [2] with a new He cross-section based on [3] ; 'obcm' which is, the same as 'bcmc', but with the He cross-section from [2] , or 'vern' [4] .

Notes

The screen output of this function is controlled by the X-Spec chatter setting ( `set_xschatter` ).

References

[1] Note that this may refer to a newer version than the compiled version used by Sherpa; use get_xsversion to check.

[2] Balucinska-Church & McCammon (1992; Ap.J.400, 699).

[3] Yan, M., Sadeghpour, H. R., Dalgarno, A. 1998, Ap.J. 496, 1044

[4] Verner et. al., 1996, Ap.J., 465, 487.

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.