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Report from the BGWG (05/11/07)

Report from the BGWG (05/11/07). Andy Read, on behalf of the EPIC-BGWG Jenny Carter, Matthias Ehle, Michael Freyberg, Kip Kuntz, Silvano Molendi, Wolfgang Pietsch, Steve Snowden. Reaction from User Group Meeting: 7-8 June 2007 (ME). Immediately after presentation:

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Report from the BGWG (05/11/07)

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  1. Report from the BGWG (05/11/07) Andy Read, on behalf of the EPIC-BGWG Jenny Carter, Matthias Ehle, Michael Freyberg, Kip Kuntz, Silvano Molendi, Wolfgang Pietsch, Steve Snowden

  2. Matthias Ehle - SCI-OAX Reaction from User Group Meeting: 7-8 June 2007 (ME) • Immediately after presentation: • UG chair (M. Arnaud) expressed thanks for all the work done by EPIC BGWG • R. Mushotzky asked about maintainability of ESAS  plan is to get it into SAS • Lack of enough FWC data to properly characterize instrumental BG  deferred for general discussion • M. Arnaud asked about tool to select blank sky fields based on galactic coordinates (not only RA/Dec). • During Discussions: • UG recognized and was impressed by tremendous amount of work done by BGWG ! • Lack of enough FWC data to properly characterize instrumental BG  Recommendation 2007-06-08/45: The UG recommends that the BGWG makes a study of the needs for closed filter data • This study exists as shown by S. Snowden during previous BGWG meeting “Filter Wheel Closed Calibration Observations” •  Quick solution: NRCO#70 approved for 2007 in August; now in EPIC routine cal plan: monthly 10 ksec dedicated FWC full frame exposures in ‘good part’ of orbit:

  3. XMM-ESAS update (SS) Acceptance for publication of the Analysis Methods/Cluster Catalog Paper Available through Astro-Ph (and here) Acceptance for publication of the Particle Background Paper Available here (not yet in Astro-Ph) Modification required for SAS V7.1 Still a work in progress Requires patches which are not yet available PN Modifications Slow progress until MOS update for SAS 7.1 PN data processing by K.Kuntz ~finished -> Couple months of CPU

  4. New release of files May 2007 addressing issues: low-E residual sources in some files small correction to vignetted exposure maps addition exposure maps with extra flags made available Updates to pages count rate graphs added in SSC bands Investigation/consideration of: ghosting problem, scaling of exposure maps, addition of new modes and increasing the size of the component file sets BGSelector tool improved, generic version of SelectRADec select on eq./gal coordinates, nH, revn., exposure, time ready for upload to pages BGWG Blank Sky Summary (JAC/AMR) • 0.5 - 2.0 keV

  5. Smaller Scripts/Tasks - New Fin_over_Fout [New – Available] Warnings put in regarding use of the MOS1 algorithm with post Rev-961 MOS1 CCD6 loss [New numbers calculated by SM – will be input v.soon]

  6. Smaller Scripts/Tasks - New BGrebinimage2SKY [New – Available] Sky template: e.g.4.35" Sky output: 4.35" Input: ANY" Now can rebin and reproject any DETX/DETY image of any binning onto the sky to the spatial scale and sky X/Y position of a user input image

  7. EPIC-pn data more scarce & RGS on longer time at end of rev • Conclusions based mainly on RGS – within scatter, no difference between instruments

  8. Evolution of the BG (years) • Instruments generally agree • No clear trend in evolution of BG • Largest changes seen at end of rev – peaks of BG increase from 2000 to 2003-2005 and then decline

  9. Evolution of the BG (months) • Seasonal dependence due to asymmetry of the Earth’s magnetic field along the sun-antisun line. • Beginning: Strong seasonal effect – high Feb-Aug – lower for rest of year – min in Dec & Jan – variation factor can be ~8 • Apogee: Similar – marked minimum in Dec & Jan – variation only <3 (only <1.5 in Mar-Oct) • End: Highest levels and strongest variations – Max in Apr (~8x Aug-Sep) – plus yearly effect

  10. Evolution of the XMM BG (Years)

  11. Evolution of the XMM BG (Months)

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