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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crossarf: mixing model for psf corrections when fitting
multiple regions
This is a general model for use when simultaneously fitting spectra from multiple regions with a telescope whose psf is large enough to scatter emission between the regions.
The model requires arf files to have been calculated for the contribution from each region to each other region. Each spectrum then needs an XFLTnnnn keyword set to “CrossArfRegion:N” where N is the region number (no particular scheme is required to assign region numbers as long as they are unique) as well as a series of XFLTnnnn keywords setting the cross arfs from region to region using the values “CrossArfFromNToM:arffile” where arffile is the arf giving the contributions to region M from region N.
As an example suppose that we have four regions then the keywords in the spectrum for the first region could be:
XFLT0001 = 'CrossArfRegion:1' XFLT0002 = 'CrossArfFrom1To2:test_1_2.arf' XFLT0003 = 'CrossArfFrom1To3:test_1_3.arf' XFLT0004 = 'CrossArfFrom1To4:test_1_4.arf'Note that it does not matter which spectrum contains the definitions for all the cross arfs as long as the spectra read in have the complete list required.