1 / 15

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:

coxdavid
Download Presentation

Report from the BGWG (05/11/07)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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)

More Related