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XMM EPIC MOS Andy Read EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 XRT Point Spread Function in Slewing Mode.

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Presentation on theme: "XMM EPIC MOS Andy Read EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 XRT Point Spread Function in Slewing Mode."— Presentation transcript:

1 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 XRT Point Spread Function in Slewing Mode

2 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 SLX 1744-299 ~ 4 arcmin SLX 1744-300 ~ 1.5 arcmin A few suitable off-axis sources are now appearing in the XMM archive… Work ongoing… Sources both on- and off- axis… moving sources… NGC7603 10 arcmin off-axis QSO 1308+326 7 arcmin off-axis AX J1746.3-2843 5.5 arcmin off-axis Off-Axis PSF

3 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 SiriusSgr X-3 pn ccd#6 pn ccd#9 EPIC PSFs For the Slew & Slow-Slew Survey, Incorporating New Modes Based on present understanding (from slew event files) Any arbitrary, straight, constant-speed path of a source through any EPIC detector

4 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 SiriusSgr X-3 pn ccd#6 pn ccd#9 EPIC PSFs For the Slew & Slow-Slew Survey, Incorporating New Modes Based on present understanding (from slew event files) Any arbitrary, straight, constant-speed path of a source through any EPIC detector

5 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 321456 121110789 DETY DETX RAWY RAWX RAWY RAWX SlewY SlewX Slew Direction PN Source Direction SlewX DETX = SlewY DETY =

6 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 DETY DETX SlewY SlewX Slew Direction RAWY RAWX 1 5 6 7 4 3 2 MOS1 Source Direction SlewX DETY = SlewY - DETX =

7 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 DETY DETX SlewY SlewX Slew Direction RAWY RAWX 1 72 63 54 MOS2 Source Direction SlewX - DETX = SlewY - DETY =

8 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 SlewY SlewX β b b – ‘impact parameter’ β – ‘impact angle’ 2 Main Parameters Also: Slew speed (90°/hr, 30°/hr) Mode (FF, eFF, 3x3) Energy …

9 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Vignetting must be taken into account – central PSFs contribute more to final summed PSF – calculate vignetted-weighted sum MOS1 MOS2

10 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Low vignetting High vignetting DETY DETX MOS1 MOS2

11 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 MOS2 function is identical Implies, with exposure maps, detector positions of low/high vignetting RGAs cause azimuthal variations in off-axis vignetting in the MOSs

12 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 DETY DETX SlewY SlewX Slew Direction RAWY RAWX 1 5 6 7 4 3 2 MOS1 Source Direction SlewX DETY = SlewY - DETX = RGS1 low vig. high vig.

13 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 DETY DETX SlewY SlewX Slew Direction RAWY RAWX 1 72 63 54 MOS2 Source Direction SlewX - DETX = SlewY - DETY = RGS2 low vig. high vig. ?

14 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 pn extended full frame – ‘frameblur’ of 18 arcseconds Slew Direction ‘ Frame-blurring ’ – within a single frame the source can travel an appreciable distance PSF at each point is blurred (stretched) in the slew direction, depending on slew-speed & mode

15 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 InstrumentModeFrame timeSlew speed‘Frameblur’ (sec)(deg/hr)(arcsec) PNFF0.073906.57 302.19 eFF0.209018.0 306.0 LW0.048904.32 301.44 MOS1/2FF2.690234.0 3078.0 LW0.99081.0 3027.0 3x30.49036.0 3012.0

16 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 InstrumentModeFrame timeSlew speed‘Frameblur’ (sec)(deg/hr)(arcsec) PNFF0.073906.57 302.19 eFF0.209018.0 306.0 LW0.048904.32 301.44 MOS1/2FF2.690234.0 3078.0 LW0.99081.0 3027.0 3x30.49036.0 3012.0

17 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 InstrumentModeFrame timeSlew speed‘Frameblur’ (sec)(deg/hr)(arcsec) PNFF0.073906.57 302.19 eFF0.209018.0 306.0 LW0.048904.32 301.44 MOS1/2FF2.690234.0 3078.0 LW0.99081.0 3027.0 3x30.49036.0 3012.0

18 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 2-D PSFs – ‘medium’ CCF PSFs – Images – fn( instr, E, theta, phi ) – used in SAS source-searching 1-D PSFs – ‘extended’ CCF PSFs – King profile (r0, alpha) – fn(instr, E, theta) – used in ARF generation/spectral fitting PSFs that are used :

19 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 2-D PSFs – ‘medium’ CCF PSFs – Images – fn( instr, E, theta, phi ) – used in SAS source-searching

20 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Source path calculated (e.g. b=5500, β=25°, for MOS1, Full-Frame, slew-speed=90°/hr) Step through n small intervals of source path – Is the source on the detector (Y/N)? For each ‘Y’ - Interpolate and rotate appropriate PSF (position, energy, instrument, mode etc.) from CCF 2-D images (512 x 512, 1.1“) - Obtain vignetting (pos, E, instr. etc.), and weight PSF image by vignetting - Stretch PSF for ‘frameblurring’ (instrument, mode, slew-speed) Add PSFs for whole source path and normalise 2D image (512 x 512, 1.1“) (sum over image = 1) MOS1, Full-Frame, slew-speed=90°/hr - 4′ PSF – unusable… Image log-scaled to enhance low-SB features

21 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 MOS1 3x3 mode slew-speed=30°/hr 12“ PSF – very usable…

22 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Need for Vignetting : e.g. PN, b=13500, β =-45°, for PN, Full-Frame, slew- speed=30°/hr) Larger contribution from off-axis PSFs (elongation in perpendicular-to-slew direction) when vignetting not correctly taken into account No VignettingVignetting

23 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Loss of CCD6 MOS1 3x3 mode slew-speed=30°/hr Loss of CCD6 causes shape change in 2-D PSF

24 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 100" MOS2 3x3 mode slew-speed=30°/hr 12“ PSF blurring Outer parts of PSF due to off-axis PSFs Inner parts of PSF due to frameblurring

25 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 pn e.g. b=-17000 β =5° (zoom-in on PSF) All PSFs compact (short frame times) FF 30°/hr best eFF 30°/hr ≈ FF 90°/hr pn, FF, 90°/hr, FB:6.6" pn, FF, 30°/hr, FB:2.2" pn, eFF, 30°/hr, FB:6.0"

26 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 CCF Files Possible CCF 2-D PSF images For each instrument, mode, energy… 2-D PSF as Function of b (impact parameter) If β (impact angle) not equal to ~0, then would need several times more images as function of b and β

27 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 CCF Files Possible CCF 2-D PSF images For each instrument, mode, energy… 2-D PSF as Function of b (impact parameter) If β (impact angle) not equal to ~0, then would need several times more images as function of b and β (note large ‘jump’ in PSF shape at edges of detector as path moves from 1 CCD to 3 CCDs)

28 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 2-D PSFs – ‘medium’ CCF PSFs – Images – fn( instr, E, theta, phi ) – used in SAS source-searching 1-D PSFs – ‘extended’ CCF PSFs – King profile (r0, alpha) – fn(instr, E, theta) – used in ARF generation/spectral fitting

29 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Source path calculated (e.g. b=0, β=0°, for MOS2, 3x3 mode, slew-speed=30°/hr) Step through n small intervals of source path – Is the source on the detector (Y/N)? For each ‘Y’ - Obtain 1-D King parameters (r0, alpha) (position, energy, instrument) from CCF - Create a 2-D image of (circular) PSF - Obtain vignetting (pos, E, instr. etc.), and weight PSF image by vignetting - Stretch PSF image for ‘frameblurring’ (instrument, mode, slew-speed) Sum weighted PSFs for whole source path Fit 2D summed PSF image with a King profile to give r0, alpha for whole source path Note: frameblurred PSFs are now non-circular (visible?) – Fitted King profiles look very good Vignetting – King parameters of final PSF are closer to those of central PSF than edge PSFs Frameblurred PSFs are wider (larger r0, flatter alpha) than the non-FB PSFs

30 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of impact parameter impact angle=0, energy=2keV All examples: pn FF, MOS 3x3, 30°/hr PN MOS1 MOS2(no CCD6) Actual CCF parameters

31 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of impact parameter (zoom) impact angle=0, energy=2keV MOS1 MOS2(no CCD6)

32 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of impact angle impact parameter=0, energy=2keV PN MOS1 MOS2(no CCD6)

33 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of impact angle (zoom) impact parameter=0, energy=2keV MOS1 MOS2(no CCD6)

34 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of energy impact parameter=0, impact angle=0 PN MOS1 MOS2(no CCD6)

35 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 r0 and alpha as function of energy impact parameter=10000, impact angle=0 PN MOS1 MOS2(no CCD6)

36 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Tangential projection not valid over whole slew. Long slews need to be subdivided to maintain astrometry. Divide slew into ~1 deg 2 images and recalculate sky positions. Source search using near-standard pipeline tuned for ~zero background + New CCF files Slew speed = 90°/hr : on-source time <~12 s (mean ~8 s) Slew speed = 30°/hr : on-source time <~36 s (mean ~24 s)

37 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Slew sources searched for in sky co-ordinate images…

38 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Slew source encircled energy & ARFs etc. calculated using sky co-ordinate images…

39 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Detector-Sky issues ? For pointed observations, sky and detector images are closely related… for slews, this may not be the case… When the source-searching finds a candidate source, how does it know what PSF is appropriate (i.e. what b, β) ? Similarly for arfgen – how does it know what the appropriate PSF is ?

40 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 Closing thoughts… Azimuthal MOS-RGA vignetting variations not included Will β always be ~0? If not, may need a whole extra dimension of CCF entries (easy to produce)

41 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Mallorca, Spain 26-27/10/06 SLX 1744-299 ~ 4 arcmin SLX 1744-300 ~ 1.5 arcmin Slewing-mode PSFs (1-D & 2-D) calculated using current CCF pointed PSFs Improvements in pointed PSFs, especially off-axis (ongoing) lead easily & directly to improved slewing-mode PSFs NGC7603 10 arcmin off-axis QSO 1308+326 7 arcmin off-axis AX J1746.3-2843 5.5 arcmin off-axis

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