XMM-Newton SAS: Watchout Page

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Дата изменения: Unknown
Дата индексирования: Fri Sep 5 18:36:34 2008
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XMM-Newton SAS: Watchout Page RGS spectrum of HR1099

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Software requirements

`LOW`, `MEDIUM`, `HIGH`, `EXTENDED` ... how do I get "the" EPIC PSF from `calview`?

The calibration file GUI task calview supports the visualization of the four basic representations of the X-ray Point Spread Function (PSF) that are encoded in the Calibration Access Layer (CAL) as part of the SAS. They can be selected by setting the Accuracy Level parameter in the calview window before invoking View/PSF or View/Encircled Energy/Encircled Energy (PSF):

LOW, corresponding to a single Gaussian parameterization. It is both energy and off-axis angle dependent, but the same for each EPIC telescope
MEDIUM, corresponding to 2-D maps generated from SciSim simulations. It is energy and off-axis angle dependent, but the same for each EPIC telescope
EXTENDED, corresponding to a King-profile model, energy, off-axis and telescope dependent [details can be found in the EPIC Calibration Status Document. Further information can be found in the following Technical Notes: CAL-TN-0022-1.0, EPIC-MCT-TN-011 (MOS), and EPIC-MCT-TN-012 (pn)]
HIGH, corresponding to a three-Gaussian model, dependent on the off-axis angle only (over a limited validity range)

As a baseline, the EXTENDED mode gives the best results for 1-D PSFs. A summary of its applicability is given in the EPIC Calibration Status Document. There is no good general model for a 2-D PSF yet, due principally to the lack of the necessary in-orbit measurements. The MEDIUM model, although based on simulations, and although it assumes that all the mirror modules have the same response, may at least give an idea of the off-axis PSF deformation. For more detailed information on the LOW, MEDIUM and HIGH mode PSFs, as well as the calibration files and the calibration SAS interface, the user is referred to the Calibration Access and Data Handbook.

Pages maintained by SAS librarian.
Any question about SAS should be addressed to the XMM-Newton help desk.
Updated on: November 18, 2006

LOW, MEDIUM, HIGH, EXTENDED ... how do I get "the" EPIC PSF from calview?

`LOW`, `MEDIUM`, `HIGH`, `EXTENDED` ... how do I get "the" EPIC PSF from `calview`?