EVALUATION OF THE XMM NEWTON CROSS CALIBRATION ARCHIVE Ana García Ruiz de Gopegui ESAC trainee Oct-Dec 2009 Supervisor: Martin Stuhlinger

Evaluation of the XMM Newton Cross Calibration Archieve INDEX 1. PURPOSE 2. INTRODUCTION 3. PSF 4. PILE-UP 5. OVERVIEW OF THE SCRIPT 6. RESULTS 7. SUMMARY 8. OUTLOOK Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 1. PURPOSE Create a tool to verify that the results of spectral analysis do not depend on the extraction region. The goal of this tool: -easy to use -automatic -generic -fast -useful for all type of point source Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 2. INTRODUCTION XMM-Newton: Most powerful X-ray telescope launched in December, 1999. Carries 3 different types of instruments: EPIC (European Photon Imaging Camera)‏ 3 CCD cameras for X-ray imaging and moderate resolution spectroscopy 2 different types of EPIC cameras: MOS and PN RGS (Reflecting Grating Spectrometer)‏ High-resolution X-ray spectroscopy Optical Monitor (OM)‏ For optical/UV imaging and grism spectroscopy. Evaluation of the XMM Newton Cross Calibration Archieve

3. Point Spread Function (PSF)‏ Determine the ability of an X-ray mirror to focus photons. PSF differs slightly between telescopes. The PSF can be affected by pile-up effects when the count rate exceeds certain limits of counts per frame. (a) 3D PSF without pile-up (b) 3D Pile-up PSF Evaluation of the XMM Newton Cross Calibration Archieve

Point Spread function for MOS1 (heavily piled-up to show the substructures) Front view of the mirror Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 3. Point spread function The shape of the PSF core is different for all cameras: (b) SPF for MOS2 (a) SPF for MOS1 Evaluation of the XMM Newton Cross Calibration Archieve

→50%lost at 10” (=200 xy coord)‏ 3. Point spread function Encircled energy as a function of radius from the centre of the PSF PSF profile →50%lost at 10” (=200 xy coord)‏ Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 4. EPIC photon pile-up Pile-up: Arrival of more than one photon within the readout time of the detectors Pattern pile-up: Two or more photons arriving next to each other in the same readout time. Energy pile-up: Two photons hitting the same pixel in the same readout. Consequences: Shifts the spectrum towards higher energies Less counts at the PSF centre Evaluation of the XMM Newton Cross Calibration Archieve

Loss of counts at the centre of the PSF 4. EPIC photon pile-up The PSF is influenced by pile-up: too many photons arrive at the same time at the core of the PSF clean PSF Loss of counts at the centre of the PSF →pile-up effect: artificial hole at its centre Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 5. OVERVIEW OF THE SCRIPT (1) Download data from XMM-Newton Science Archive (2) Define the source region and the background region (3) Extract spectrum from all different annulli (4) Find a suitable model for the source spectrum (5) Spectral fitting for all the individual spectrum (6) Compare results of the different annulli. Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve (2) Images from different regions Evaluation of the XMM Newton Cross Calibration Archieve

(3) Spectra for different regions Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 6. FINAL RESULT Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 7. SUMMARY All the parameters are identical (within errors) until ~20 arcsec: moderate pile-up does not affect scientific results. General tool that makes everything automatically except: definition of source/background coordinates and spectral model of the source. Why do we create this tool?? EPIC group is changing the model for the PSF: with this tool we check the results of the spectral analysis (→should be independent from the region we extract the data)‏ Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve 8. OUTLOOK (a) Current model (b) New model Evaluation of the XMM Newton Cross Calibration Archieve

Evaluation of the XMM Newton Cross Calibration Archieve Thanks to you all…. …. Any questions?? Evaluation of the XMM Newton Cross Calibration Archieve