Last modified: December 2018

AHELP for CIAO 4.11 Sherpa v1


Context: models


Velocity shift a multiplicative model. XSpec convolution model *Experimental*.


This convolution model velocity shifts a multiplicative model. It takes the calculated model and shifts energies by -Ev/c.

xsvmshift Parameters

Number Name Description
1 Velocity Velocity (km/s)

Loading the X-Spec convolution models

Please see ahelp xsconvolve for information on how to load the model.


XSpec version

This information is taken from the XSpec User's Guide. Version 12.10.0e of the XSpec models is supplied with CIAO 4.11.


sherpa> from sherpa_contrib.xspec.xsconvolve import load_xsvmshift
sherpa> load_xsvmshift("vms")
sherpa> set_source( * vms(xsphabs.zgal) *
sherpa> vms.velocity = -6000

The power-law is multiplied by both a velocity-shifted (zgal) and local (gal) absorption.

About Contributed Software

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.

See Also

list_model_components, list_models, load_xscflux, load_xsclumin, load_xscpflux, load_xsgsmooth, load_xsireflect, load_xskdblur, load_xskdblur2, load_xskerrconv, load_xslsmooth, load_xspartcov, load_xsrdblur, load_xsreflect, load_xsrfxconv, load_xsrgsxsrc, load_xssimpl, load_xsvashift, load_xsxilconv, load_xszashift, load_xszmshift, models, tablemodel, xs, xsconvolve