report from the bgwg (05/11/07)
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
2
Matthias Ehle - SCI-OAX
Reaction from User Group Meeting: 7-8 June 2007 (ME)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:
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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 progressRequires patches which are not yet available
PN ModificationsSlow progress until MOS update for SAS 7.1PN data processing by K.Kuntz ~finished
-> Couple months of CPU
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
BGWG Blank Sky Summary (JAC/AMR)
• 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
• 0.5 - 2.0 keV
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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]
Smaller Scripts/Tasks - New
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
Input: ANY" Sky template: e.g.4.35" Sky output: 4.35"
BGrebinimage2SKY
[New – Available]
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
Smaller Scripts/Tasks - New
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
• Conclusions based mainly on RGS – within scatter, no difference between instruments
• EPIC-pn data more scarce & RGS on longer time at end of rev
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
Evolution of the XMM BG (Years)
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
Evolution of the XMM BG (Months)
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Andy Read (amr30@star.le.ac.uk)OPS/CAL/BG (OCB) MeetingMallorca, Spain 05-07/11/07
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