|AHELP for CIAO 4.9 Sherpa v1||
The XSpec convolution models *Experimental*.
The sherpa_contrib.xspec.xsconvolve module provides an *experimental* interface to the X-Spec convolution models. Please contact the CXC HelpDesk if you have problems with these models.
Convolution components apply a convolution operator to an input model flux calculated from a source (additive) model, as modified by other components (multiplicative factors or other convolution operators). They differ from multiplicative components, which only apply a bin-wise multiplicative factor, by allowing transformations of the flux across energy bins.
Commands to create convolution models
|load_xsireflect||reflection from ionized material|
|load_xskdblur||convolve with the laor model shape|
|load_xskdblur2||convolve with the laor2 model shape|
|load_xskerrconv||accretion disk line shape with BH spin as free parameter|
|load_xsrdblur||convolve with the diskline model shape|
|load_xsreflect||reflection from neutral material|
|load_xssimpl||comptonization of a seed spectrum|
|load_xszashift||Redshift an additive model|
|load_xsmshift||Redshift a multiplicative model|
To use these model, the xsconvolve module from the CIAO contributed package must be installed. The relevant load routine can then be loaded with a command like
sherpa> from sherpa_contrib.xspec.xsconvolve import load_xscflux
or all models loaded by saying
sherpa> from sherpa_contrib.xspec.xsconvolve import *
The load command can then be used to create a component in the same manner as load_conv, namely
sherpa> load_zashift("zas") sherpa> set_source(xsphabs.gal * zas(xspowerlaw.pl + xsgaussian.gl)) sherpa> zas.redshift = 0.23
which applies a local absorption model to the redshifted power law and gaussian componente.
- This is an experimental release of the convolution models; please take care when using this model.
- The convolution models can be applied to any 1D model, not just the X-Spec models.
- Sherpa does not have an equivalent of the extend command in X-Spec.
This information is taken from the XSpec User's Guide. Version 12.8.0k of the XSpec models is supplied with CIAO 4.6.
The sherpa_contrib.xspec.xsconvolve module is new in this release.
This script is not an official part of the CIAO release but is made available as "contributed" software via the CIAO scripts page. Please see this page for installation instructions - such as how to ensure that the parameter file is available.
For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.
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