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