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Efficient Screening and Reprocessing Strategies for the 2XMM Data Set

This presentation outlines the reprocessing and screening strategies implemented for the 2XMM data set. It delves into automatic source flagging, the extraction of information on attitude shifts, and the management of potential pileup events. The screening process involves both automated and manual reviews, with detailed estimates on time and manpower required for comprehensive assessment. The challenges of early observations and the necessity for manual flagging of certain detections are discussed, highlighting significant findings on spurious sources.

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Efficient Screening and Reprocessing Strategies for the 2XMM Data Set

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  1. Screening Issuesfor2XMM / Reprocessing Anja Schröder, Univ of Leicester, UK

  2. Outline • Reprocessing: all products • 2XMM: • additional automatic source flagging • manual source flagging

  3. Reprocessing

  4. Screening for reprocessing As part of the pipeline: • Automatic source flagging • Extraction of information about attitude shift and pileup • Easier presentation of PNG and PDF files To do manually: • View all html, PNG and PDF files • View images and source overlays • Give formalized comments about problems

  5. Screening for reprocessing: time estimate ODFs: 5137 in total (plus real-time observations from now on) Screening: ~ 20 minutes per ODF on average Man power in hours/week (excluding real-time screening): CESR 4 (+ ~full time from January) Saclay 5 MPE 5+5 AIP 5 OA full for 5 weeks LUX 20+8

  6. Screening for reprocessing: time estimate ODFs: 5137 in total (plus real-time observations from now on) Screening: ~ 20 minutes per ODF on average Man power in hours/week (excluding real-time screening): CESR 4 (+ ~full time from January) Saclay 5 MPE 5+5 AIP 5 OA full for 5 weeks LUX 20+8 __________ ~80 hours/week -> 21 weeks -> ~6 months

  7. Screening for reprocessing: Early revolutions Rev < 0054 – 0060: ‘new’ ODFs from commissioning phase and very early observations -> often testing of various modes etc -> not always recognized -> not processed properly? => how to screen?

  8. Automatic source flagging (dpssflag) • Flag 1: MASKFRAC (camera) < 0.5 • Flag 2: Near bright source (-> circle) • Flag 3: within extended (-> circle) • Flag 4 – 6: conditions for spurious extended sources (according to scheme by G. Lamer) • Flag 7: probably spurious extended source • Flag 8 – M1: on MOS 1 bright corner (central CCD/window) in bands 1, 2, 3 • Flag 9 – M1: near MOS 1 bright corner (central CCD/window) in bands 1, 2, 3 • Flag 8 - PN: on PN bright column in band 1

  9. Flag 1 and MOS1 flag 8 flag 1: red diamond (-> MASKFRAC) flag 8 for M1: red square

  10. PN flag 8: bright columns in band 1 PN band 1 image

  11. PN flag 8: bright columns in band 1 PN band 1 image 41% observations have at least one flag 9 31% of the flagged detections are apparently caused by a bright column

  12. Flag 2 & 4: near source flag 2:yellow circle point sources: r = 65*SQRT(RATE) rmin = 10" rmax = 400" => 91% of cases radius is fine flag 4 (not shown): prob. spurious extended detection

  13. Flag 3: in extended emission extended sources: r = 4 x EXT ["] rmax = 200” point sources src 1: EXT = 2.5 px src 2: EXT = 2.9 px

  14. Flag 3: in extended emission extended sources: r = 4 x EXT ["] rmax = 200” point sources flag 3:yellow diamonds

  15. Flag 5 & 7: probably spurious extended emission extended sources: r = 160” rate ratio <= 0.4 point sources flag 5/7: white ellipse

  16. Reprocessing: No automatic flags Not flagged are: • OOT events (-> spur detections when src piled up) • RGA reflection spike • single reflections:

  17. Screening Sources for 2XMM

  18. 2XMM Source Screening Source flagging: • automatic flagging done in the pipeline • additional automatic flagging (work in progress -> Masa): • OOT events • RGA scattered light spike • cannot automatically flag all spurious detections -> manual flagging is necessary for the catalogue !

  19. Additional automatic flagging: OOT events green and cyan: detections yellow: flags 2 and 3 white ellipse: likely spurious det if source piled-up -> OOT events are detected automatic flagging by: Masa Sakano

  20. Additional automatic flagging: RGA spike RGA scattered light spike … but no source

  21. Additional automatic flagging: RGA spike RGA scattered light spike … but no source

  22. Manual flagging: extended source point sources: r = 65*SQRT(RATE) extended sources: r = EXT ["]

  23. Manual flagging: extended source point sources: r = 65*SQRT(RATE) extended sources: r = EXT ["] ds9 contour: level: 3,5,10 smooth = 32 yellow polygon region: by hand

  24. Manual flagging: point source

  25. Manual flagging: point source yellow polygon region mask flag all sources within the region (warning flag only!) exclude inside region for sky coverage (log N – log S) conversion by: Maite Ceballos

  26. Screening for 2XMM: time estimate ODFs: 5137 in total Screening: 750 proprietary ~20% no EPIC data ~50%have no obvious spurious detections => ~1800 ODFs with <5 minutes per ODF Estimate: 2 persons at 2 hr/day: ~ 5 weeks

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