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XMM-Newton EPIC Background Working Group - Providing Clear Information and Tools for Background Analysis

The XMM-Newton EPIC Background Working Group was founded approximately one year ago to steer and supervise the analysis of the EPIC Background. Regular meetings and presentations have been held to provide the user with clear information on the background analysis. The group has released a web page with recommended information, papers, and summary tables. They are also working on developing various background analysis tools and a SAS tool for professional flare screening.

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XMM-Newton EPIC Background Working Group - Providing Clear Information and Tools for Background Analysis

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  1. XMM-Newton EPIC BackGround Working Group founded (~1 year ago)Steering and supervising committee to provide the user with clear information on the EPIC Background and (SAS)-Tools to treat the EPIC Background correctly for various scenarios (ESAC, Goddard, Leicester, MPE) Regular meetings (3rd on 02/05/06) and telecons + presentations (SSC, NAM) Released: BG analysis web page with recommended information, papers, summary tables etc:http://xmm.esac.esa.int/external/xmm_sw_cal/background/index.shtml XMM-ESAS XMM-Newton Extended Source Analysis Software package model the quiescent particle background both spectrally and spatially for the EPIC MOS detectors XMM-Newton blank sky event files used when the user has difficulty in extracting a suitable background region from their observation (clusters, SNRs, filled FOV etc…) Links to sets of closed EPIC event files Under development: SAS tool to perform professional flare screening for EPIC-MOS and EPIC-pn (SASdevel) XMM-ESAS for pn Various other BG analysis tools Long-term timeline of instrumental BG + soft proton flare spatial and spectral analysis Analysis of XRT+EPIC Straylight – out-of-FOV and out-of-window EPIC BGWG

  2. SS/KK XMM-ESAS • soft proton flare screening • modeling the quiescent particle background both spectrally and spatially for the EPIC MOS detectors • producing background spectra for user-defined regions of the detectors and background images (FITS standard) • XMM-ESAS is based on the software used for the background modeling described in Snowden, Collier & Kuntz (2004, ApJ, 610, 1182). Fitted background subtracted spectrum Proton flare screening Same fit as above but without the background subtracted from the data

  3. XMM-ESAS Background subtracted, exposure corrected, and Adaptively smoothed image of Abell 1795 in the 0.35-1.25 keV band.

  4. Superposition of many pointed observations of pipeline product data from 2XMM – flare-cleaned, filtered, source-removed… Background events files and exposure maps - MOS1, MOS2, pn Mode (eFF, FF) Filter (thin, medium, thick) Type (filled, unfilled) Vignetting (with, without [Exp. Maps]) S/W Select BG events from a certain area of the sky Cast event files onto sky Re-project and rebin exposure maps onto sky All to match user’s own data and analysis Available from ESAC BG page JAC/AMR Blank Sky Analysis Images from events files with sources removed Images from events files after event filling

  5. Blank Sky Analysis Instrument Mode Filter NOBS Exp.time (s)

  6. Instrumental BG for a typical MOS chip – KK/SS Rate Hardness Index

  7. - Not all chips are well behaved… Detector Phenomenology

  8. Not all chips are well behaved… Detector Phenomenology

  9. -Not all chips are well behaved… MOS1-4, MOS1-5, MOS2-2, MOS2-5 anomalous states occur at different times always characterized by high rates and low hardness Detector Phenomenology

  10. MOS1-4, MOS1-5, MOS2-2, MOS2-5 always characterized by high rates and low hardness due to low energy “plateau” “extra” component somewhat localized for some chips Detector Phenomenology 0.3-0.8 keV 2-5S 2-5H

  11. MOS1-4, MOS1-5, MOS2-2, MOS2-5 “extra” component somewhat localized for some chips, but not so clear in other cases MOS1-4 anomalous state does not generally appear in the corner pixels Detector Phenomenology 0.3-0.8 keV 1-4S 1-4H

  12. Summary of States S: “standard state” V: “verification” : 1-4, 2-2, 2-5 for Rev<41.5 H: “high”:1-4, 1-5, 2-5, detectable in corner pixels A: “anonymous”: 1-4, not detectable in corner pix. No other chip has yet been detected in A state But since A state can only be detected in FWC data… Need to understand what causes these states Are there detector parameters that can be used to detect these states independently? Particularly important for the A states! Detector Phenomenology

  13. Soft Proton Flares

  14. - Only small scale feature is low energy “hot” edge of MOS1-2, none seen in MOS2 - Distribution flat at low energies, peaked at higher energies Soft Proton Flares

  15. EPIC Background Working Group: For updates on: knowledge, understanding, software (ESAS), files (blank sky, closed) etc. … http://xmm.vilspa.esa.es/external/xmm_sw_cal/background/index.shtml

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