XMM EPIC MOS Andy Read ([email protected]) OPS/CAL/BG (OCB) Meeting Mallorca, Spain 05-07/11/07...

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Andy Read ([email protected])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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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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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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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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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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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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• 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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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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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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Evolution of the XMM BG (Years)

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Evolution of the XMM BG (Months)

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XMM EPIC MOS Andy Read ([email protected]) OPS/CAL/BG (OCB) Meeting Mallorca, Spain 05-07/11/07...

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