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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.


lsmooth: lorentzian smoothing

Lorentzian smoothing with a variable width, which varies as the par2 power of the energy. The width at 6 keV is set with par1.

$\displaystyle \begin{array}{ll}
dC(E) = & \frac{\Sigma(E)}{2\pi[(E-X)^2+(\Sigma(E)/2)^2]}A(X)d(X)\\ [.2cm]\Sigma(E) = & \sigma(E/6)^\alpha
\end{array}$

where:

par1=$\sigma$ lorentzian sigma at 6 keV
par2=$\alpha$ power of energy for sigma variation