The Slow Slew Survey Richard Saxton / Pedro Rodriguez November 2006 Nov SSC Potsdam Slow slew survey / Richard Saxton 2 Operations Scan over the Galactic plane at 30 degs/hour Orbit 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 SSC Potsdam Slow slew survey / Richard Saxton 3 Exposure time PN exposure map Pedro Rodriguez Nov SSC Potsdam Slow slew survey / Richard Saxton 4 Exposure time M1 mean=17.3 M2 mean=21.5 sPN mean=18.6 s With overlap, PN mean exposure time ~35 s Nov SSC Potsdam Slow slew survey / Richard Saxton 5 Instrument modes: EPIC-pn EPIC-pn operated in FF mode with Medium filter Nov SSC Potsdam Slow slew survey / Richard Saxton 6 Instrument modes: EPIC-MOS EPIC-MOS cameras operated in FF (3x3 pixel binning) mode with Medium filter EPIC-MOS cameras operated in FF (3x3 pixel binning) mode with Medium filter Leg Nov SSC Potsdam Slow slew survey / Richard Saxton 7 MOS 3x3 mode SAS for simplicity remaps raw pixels from the 203x201 back 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== New SAS mode PRIMEFULLWIN3X3 Intended 0.4 s frame time but 0.8 s in practice. Nov SSC Potsdam Slow slew survey / Richard Saxton 8 MOS 3x3 energy scale Spectrum of all pattern 0 events Al = /- 7 eV Looks good Nov SSC Potsdam Slow slew survey / Richard Saxton 9 Instrument modes: RGS RGS operated with 1 CCD centred on Oxygen VII (~0.7 keV) RGS operated with 1 CCD centred on Oxygen VII (~0.7 keV) Nov SSC Potsdam Slow slew survey / Richard Saxton 10 MOS-2 full slew, first leg (242/3), 30 degrees/hour MOS-2 PN Slow survey mode 1E MOS position 10 off Nov SSC Potsdam Slow slew survey / Richard Saxton 11 PSF IGR J Andy Read Nov SSC Potsdam Slow slew survey / Richard Saxton 12 PSF Extension=12 in slew direction due to frame time of 400 ms actually 24 extension because of 800 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 Nov SSC Potsdam Slow slew survey / Richard Saxton 13 PSF IGR J Andy Read Nov SSC Potsdam Slow slew survey / Richard Saxton 14 Properties Mean background (c/arcmin 2 ) from slew legs 5,7: INST INST PN PN M M M M But extraction region bigger for MOS (1.5-2x depending on final frame time) Flux Limits INST INST PN 5x x x PN 5x x x PN+MOS1/2 4x x x PN+MOS1/2 4x x x PN: Exposure time ~6x normal slew, limits 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 31 Q.E. to be calibrated. Q.E. to be calibrated. 3x deeper than XMMSL1 Nov SSC Potsdam Slow slew survey / Richard Saxton 15 Source list Coords Count Rate ID PN M1 M2 RASS GX V* V926 Sco U E IGR J AX J AX J E GREAT ANNIHILATOR E HD HD RXS J HD AX J Nov SSC Potsdam Slow slew survey / Richard Saxton 16 Source list stats Search on combined first 8 EPIC-pn slews (Pedro Rodriguez) 72 sources in 86 deg 2 (> 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 Nov SSC Potsdam Slow slew survey / Richard Saxton 17 Light curve Shows vignetting effect of movement through detector Nov SSC Potsdam Slow slew survey / Richard Saxton 18 Spectra 1E LMXB, NH=6E21 Pile-up a 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 (?) for slew movement of PSF across 4 big pixels during frame 3-4 c/s same pile-up flux limit for MOS / PN ! Nov SSC Potsdam Slow slew survey / Richard Saxton 19 Spectral: bright sources GX 3+01 N H =1E22 Nov SSC Potsdam Slow slew survey / Richard Saxton 20 Summary PN no surprises MOS work to do with s/w, calibration and CCFs Great for mapping large extended sources Probe flux levels intermediate between XMMSL1 and dedicated short pointings Covers 200 deg 2 in 1 revolution Position error is ~4 arcsecs similar to pointed obs for low count sources