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To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.

The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.

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vashift: velocity shift an additive model

This convolution model velocity shifts an additive model. It takes the calculated model and shifts energies $-Ev/c$.

The energies command must be to used to extend the energy range over which the model.

The parameter is:

par1=$v$ velocity (km/s)

An example model use is: 

XSPEC>model phabs*vashift*(pow+ga)
which velocity shifts the power-law and gaussian then multiplies by local absorption.