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psfgen The SAS Task

PSFgen tool offers high flexibility in generating PSFs for XMM instruments. Utilize main parameters like instrument selection, PSF accuracy level, energy of interest, and more to customize PSFs. Coordinate complexity options available. Check out examples and operating system dependencies.

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psfgen The SAS Task

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  1. psfgen The SAS Task

  2. What is psfgen? A tool that has more flexibility on creating PSFs of the XMM instruments.

  3. Main parameters • instrument, ccdnr– select the camera & CCD • level – PSF accuracy level • energy – list of energy of interest • theta, phi – PSF centre on the cameras • rotate – the telescope position angle • coortype – the output PSF coordinate • xsize, ysize – the size of the PSF

  4. Coordinate complexity Theta/phi (input of cal) Location on camera polar Cartesian xy (output of calview/cal) whole camera Invert X Rotate Image/PSF detx/dety Shrink 22 times rawx/rawy Individual CCD position angle: anti-clockwise on xy coordinate

  5. image parameter to rescue psfgen image=an_example_image.fits level=ELLBETA (Note: the centre of the source should be located at the region centre.)

  6. Examples – 0470_0109480101_002 MOS2 xy detx/dety rawx/rawy Select the source usingdifferent coordinates from xmmselect.

  7. Examples

  8. Operating System dependency MOS1 3000eV theta=500 phi=60 MOS2 1000eV theta=300 phi=45 (Note: the numbers in the table are the counts of the pixels that differ between two OS PSFs. The total pixel number of a PSF is about 40K.)

  9. Operating System dependency • Not the precision error. • Relative error from few percent to few hundreds percent. • Extreme example 1 – 0.001029 vs 0.014383 (10 times difference) • Extreme example 2 – 3.98332 vs 4.98503 (1.0017 difference)

  10. EPIC MOS Plotting Viewer http://manaslu.star.le.ac.uk/epic8/xmm-viewer/

  11. Thank you!

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