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

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 xydetx/dety rawx/rawy Select the source using different coordinates from xmmselect.

7. Examples

8. Operating System dependency MEDIUM Level LinuxSolaris OSX PowerPC OSX i386 Linux815581 Solaris391040 OSX PowerPC 390104 OSX i386 3900 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!