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The Slow Slew Survey. Richard Saxton / Pedro Rodriguez November 2006. Operations. Scan over the Galactic plane at 30 degs/hour Orbit 1242 - 16 legs covering 45 x ~0.5 degs with 15 arcmin overlap between legs ~200 sq degs - PowerPoint PPT Presentation
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TheTheSlow Slew SurveySlow Slew Survey
Richard Saxton / Pedro RodriguezRichard Saxton / Pedro Rodriguez
November 2006November 2006
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 22
OperationsOperations Scan over the Galactic plane at 30 degs/hour Orbit 1242 - 16 legs covering 45 x ~0.5 degs with 15 arcmin overlap between legs ~200 sq degs Open loop slew for 1.5 hours, followed by closed-loop slew of 17 mins to set position to start of next leg. Nominal Manually intensive to plan Drift was very small, typical offset was 2 arc mins Gives effectively a 1ks pointed obs at the end of each slew leg Closed slew data not available this time because of PN DLI
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 33
Exposure timeExposure time
PN exposure map – Pedro Rodriguez
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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Exposure timeExposure time
M1 – mean=17.3 M2 – mean=21.5 s PN – mean=18.6 s
With overlap, PN mean exposure time ~35 s
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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Instrument modes: EPIC-pnInstrument modes: EPIC-pn EPIC-pnEPIC-pn operated in FF mode with Medium filter operated in FF mode with Medium filter
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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Instrument modes: EPIC-MOSInstrument modes: EPIC-MOS EPIC-MOSEPIC-MOS cameras operated in FF (3x3 pixel binning) mode with Medium cameras operated in FF (3x3 pixel binning) mode with Medium
filterfilter
Leg 9124200003
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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MOS 3x3 modeMOS 3x3 mode
SAS for simplicity remaps raw pixels from the 203x201back onto the original 610 x 602 grid randomising to avoid gaps.
emchain emenergy:rejectbade3e4=NO emenergy:detectbadoffset=NO badpixfind=no
Use events with #XMMEA_EM && PATTERN==0
203
201New SAS mode
PRIMEFULLWIN3X3
Intended 0.4 s frame time but 0.8 s inpractice.
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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Instrument modes: RGSInstrument modes: RGS RGSRGS operated with 1 CCD centred on Oxygen VII (~0.7 keV) operated with 1 CCD centred on Oxygen VII (~0.7 keV)
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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PSFPSF
IGR J17497-2821 – Andy Read
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 1212
PSFPSF
Extension=12” in slew direction due to frame time of 400 ms – actually24” extension because of800 ms clocking.
• PSF needs to be modeled fully for correct ARF• Experience with PN eFF mode (18” extension) shows that sources are still found but are falsely flagged as extended
1E 1746.7-3224
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 1313
PSFPSF
IGR J17497-2821 – Andy Read
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 1414
PropertiesPropertiesMean background (c/arcminMean background (c/arcmin22) from slew legs 5,7:) from slew legs 5,7:
INST 0.2-12 0.2-2 2-12INST 0.2-12 0.2-2 2-12---------------------------------------------------------------------------------- PN 0.56 0.28 0.28PN 0.56 0.28 0.28 M1 0.10 0.062 0.041M1 0.10 0.062 0.041 M2 0.11 0.067 0.066M2 0.11 0.067 0.066
But extraction region bigger for MOS (1.5-2x depending on final frame time)But extraction region bigger for MOS (1.5-2x depending on final frame time)
Flux LimitsFlux Limits
INST 0.2-12 0.2-2 2-12INST 0.2-12 0.2-2 2-12-------------------------------------------------------------------------------------------------------------- PN 5x10PN 5x10-13-13 2.5x10 2.5x10-13-13 1.6x10 1.6x10-12-12
PN+MOS1/2 4x10PN+MOS1/2 4x10-13-13 2x10 2x10-13 -13 1.3x10 1.3x10-12-12
PN: Exposure time ~6x normal slew, limitsPN: Exposure time ~6x normal slew, limitsMOS ~3x lower eff. Area (depending on spectrum, etc.) but 2-3x lower backgnd.MOS ~3x lower eff. Area (depending on spectrum, etc.) but 2-3x lower backgnd.
MOS 3x3 Pattern 0 = Singles + 2/3 doubles + 4/9 (trips+quads) + Part of Patt 31MOS 3x3 Pattern 0 = Singles + 2/3 doubles + 4/9 (trips+quads) + Part of Patt 31 Q.E. to be calibrated….Q.E. to be calibrated….
3x deeper than XMMSL1
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Slow slew survey / Richard SaxtonSlow slew survey / Richard Saxton 1515
Source listSource list Coords Count Rate ID PN M1 M2 RASS17 47 55.84 -26 33 50.0 270.3 58.3 64.5 19.2 GX 3+0117 38 58.07 -44 26 59.8 204.4 - - 61.9 V* V926 Sco17 50 11.92 -37 03 02.6 89.3 - - 4.1 4U 1746-3717 46 05.01 -29 30 53.3 39.4 - - 0.14 2E 1742.9-292917 49 37.93 -28 21 15.2 46.6 10.6 8.8 - IGR J17497-282117 47 25.85 -29 59 58.7 35.7 14.5 9.3 0.1 AX J1747.4-300017 47 25.95 -30 02 38.8 13.3 9.2 4.1 0.1 AX J1747.4-300317 46 20.91 -28 43 40.0 9.1 - - - 2E 1743.1-284217 43 54.73 -29 44 41.4 8.6 - - - GREAT ANNIHILATOR17 50 03.98 -32 25 51.4 6.0 - - 0.08 2E 1746.7-322517 47 39.40 -35 48 23.0 4.0 0.9 1.0 0.25 HD 16152917 47 35.02 -40 07 35.1 1.6 0.21 0.46 - HD 16147117 48 35.74 -32 54 55.5 1.7 0.41 0.25 0.05 1RXS J174835.9-32551317 46 01.74 -40 47 48.3 0.8 - - 0.05 HD 32432317 49 07.22 -27 32 30.0 0.9 0.17 - - AX J1749.1-2733
Nov 13-15 2006Nov 13-15 2006SSC PotsdamSSC Potsdam
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Source list statsSource list stats
Search on combined first 8 EPIC-pn slews (Pedro Rodriguez) –
72 sources in 86 deg2 (> 3 sigma)Position error = 3.6 arc sec (median) [Simbad optical positions]
MOS positions also generally ok to a few arc secs
44/72 identified from SIMBAD, 33/72 Rosat sources
30-40% unknown sources, brightest=1.8 c/s (pn) [F=5E-12]
Standard edetect_chain issues:
- Many false “Halo” sources around bright sources- eexpmap took ~ 0.5 hours / 1 deg image for 0.1s resolution drove the processing schedule
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SpectraSpectra
1E 1746.7-3224 – LMXB, NH=6E21
Pile-up a problem @
PN: 8 c/s
MOS: 1 c/s for pointed FF mode x 6 for 0.4s frame time / ~3 for 3x3 big pixel x 1.5 - 2 (?) for slew movement of PSF across 4 big pixels during frame
≈ 3-4 c/s ≈ same pile-up flux limit for MOS / PN !
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Spectral: bright sourcesSpectral: bright sources
GX 3+01 – NH=1E22
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SummarySummary PN – no surprises MOS – work to do with s/w, calibration and CCFs Great for mapping large extended sources Probe flux levels intermediate between XMMSL1and dedicated short pointings Covers 200 deg2 in 1 revolution Position error is ~4 arcsecs – similar to pointed obs forlow count sources