IXO/CAT: Response Files


Response Files

Response file ftp site (or this alternate site): Here you can find a tar file containing the response matrix ("rsp") files for CAT orders 1-5, the zeroth order + direct contribution, and the no-grating response. The CAT files are for a nominal resolving power of 3000 and Lorentzian profiles. Example scripts and the README are included in the tar file(s).

NOTE: our ftp site has been having difficulty and hanging after transfer of about 2MB. We're looking into it. If you can't get the files, email me (David P. Huenemoerder, dph@space.mit.edu) and tell me where I can upload them for you.

These are standard response matrix files suitable for use in ISIS, Xspec, or Sherpa.


  1. CAT_D180_R3000_Lm1.rsp: 180 degrees of sectors tiled per side ("D180"), resolving power 3000 ("R3000"), Lorentzian instrumental profile ("_L"), first order ("m1"). "rsp" implies that both redistribution and effective area are included.
  2. CAT_D180_R3000_Lm2.rsp: 2nd order;
  3. CAT_D180_R3000_Lm3.rsp: 3rd order;
  4. CAT_D180_R3000_Lm4.rsp: 4th order;
  5. CAT_D180_R3000_Lm5.rsp: 5th order;
  6. CAT_D180_m0.rsp: Zeroth order, plus the direct beam from the open inner annulus. This portion falls on the microcalorimeter detector.
  7. XMS.rsp: The no-grating response.
An instrumental configuration is defined by items 1-5, or no grating, item 6.

Other Files

We have also made responses for he nominal IXO Project requirements of effective area ~3000 cm^2, resolving power of ~3000. We have done this by scaling the sector area down to a full-angle of 54 degrees and also computing the corresponding zeroth order throughput. Resolution was left unchanged, though in detail, it may improve with a smaller sector angle. The files are as above with a "D54" instead of "D180" mnemonic.

Other files are available on request, for either Gaussian profiles or R~5000. Separate effective area ("ARF") and redistribution ("RMF") files are also available. the ARF files contain additional columns which are the factors of the effective area (mirror, detector, grating efficiencies).

This page was last updated Jan 8, 2010 by David P. Huenemoerder. To comment on it or the material presented here, send email to dph@space.mit.edu.
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