screening issues for 2xmm / reprocessing
Post on 13-Jan-2016
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Screening Issuesfor
2XMM / Reprocessing
Anja Schröder, Univ of Leicester, UK
Outline
• Reprocessing: all products
• 2XMM: – additional automatic source flagging– manual source flagging
Reprocessing
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
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
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
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?
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
Flag 1 and MOS1 flag 8
flag 1: red diamond (-> MASKFRAC)
flag 8 for M1: red square
PN flag 8: bright columns in band 1
PN band 1 image
PN band 1 image
41% observations have at least one flag 9
31% of the flagged detections are apparently caused by a bright column
PN flag 8: bright columns in band 1
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
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
Flag 3: in extended emission
extended sources:
r = 4 x EXT ["] rmax = 200”
point sources
flag 3: yellow diamonds
Flag 5 & 7: probably spurious extended emission
extended sources:
r = 160” rate ratio <= 0.4
point sources
flag 5/7: white ellipse
Reprocessing: No automatic flags
Not flagged are:• OOT events (-> spur detections when src
piled up)• RGA reflection spike• single reflections:
Screening Sources for 2XMM
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 !
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
Additional automatic flagging: RGA spike
RGA scattered light spike … but no source
Additional automatic flagging: RGA spike
RGA scattered light spike … but no source
Manual flagging: extended source
point sources:
r = 65*SQRT(RATE)
extended sources:
r = EXT ["]
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
Manual flagging: point source
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
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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