XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL Meeting (OCB) Palermo 11-13/04/07 XRT Point...

XMMEPICMOS

Andy Read (amr30@star.le.ac.uk)EPIC CAL Meeting (OCB)Palermo 11-13/04/07

XRT Point Spread Function

Off-Axis PSFOn-Axis PSF improvements

1-D & 2-D PSFsImplications for (Slow) Slew…

Future…

XMMEPICMOS

• 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 in SAS:

XMMEPICMOS

• 2-D PSFs – ‘medium’ CCF PSFs – Images – fn(instr, E, theta, phi) – used in SAS source-searching

Images for each instrument at various Energy and Off-axis angle – presently all SCISIM-generated, simple, and all the same for each instrument – SAS-devel, SSC, UG, users etc say these are not good enough.

PSFs that are used in SAS:

XMMEPICMOS

On- and off-axis 2-D PSF - Analysis

• From 2XMMp source list, select M1, M2, PN point sources that

• have large numbers of counts

• are below pile-up limit (mode-dependent)

• cover full range in off-axis angle (0-15 arcmin)

• presently (April 2007) ~200 sources/instrument

XMMEPICMOS

• Clean event files for times of high-BG, bad events, out-FOV events etc.

• Make large-scale images – find exact position of source – reject if crowded field or there are chip gaps, bad columns etc through source

• Make small CCF (512x512, 1.1”) images around source

• All E-bands, all instruments

• Subtract other sources

XMMEPICMOS

• Rotate image

• wrt PA (see later)

• wrt PA and position on the detector

• Gaussian centre and rebin to exact centre of 512x512 image (1” binning)

• All performed for each source, for each energy-band and for each instrument

Rotate wrt PA Rotate wrt PA+DetPos Rotate wrt PA and rebinned/re-centred

Rotate wrt PA+DetPos and rebinned/re-centred

XMMEPICMOS

• Collect good final rebinned/re-centred/rotated images together for each:

• Instrument (3)

• Energy band (8)

• Off-axis angle band (6)

• Stack images together

• Clean, BG-subtract stacked images

• Clean headers

• Clean outer areas

• Careful BG-subtraction

• Re-normalization

• Create CCF files from final stacked, cleaned, BG-subtracted, re-normalized images

• Note: Can create on- and off-axis (E-dep) 1-D PSFs (i.e. extended mode – arfgen PSFs) by constructing radial profiles from these images and perform King-fitting

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

First source-search with AMR-‘F’ CCFs:

0032141201

Problem source to bottom-left

Blue – current CCFs

Green – AMR-‘F’ CCFs

XMMEPICMOS

0032141201

Estimated source counts

AMR-F v current

XMMEPICMOS

0032141201

Estimated source flux

AMR-F v current

XMMEPICMOS

0032141201

Estimated source count-rate

AMR-F v current

XMMEPICMOS

0032141201

Detection likelihood

AMR-F v current

XMMEPICMOS

0032141201

Estimated source extent

AMR-F v current

XMMEPICMOS

0032141201 Very bright off-axis source (problematic)

Current CCF AMR-F CCF

XMMEPICMOS

0032141201 Bright on-axis source

Current CCF AMR-F CCF

XMMEPICMOS

arfgen (non-default) works with AMR PSF CCF…good…

…but large offset…

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

‘G’

Energy

Off-axis angle

M1 More Data, improved BG subtraction, noise reduction, stacking… - Set ‘G’

XMMEPICMOS

‘G’

Energy

Off-axis angle

XMMEPICMOS

‘G’

Energy

Off-axis angle

XMMEPICMOS

0032141201

BLUE-CCF

GREEN-AMR-F

BLUE-CCF

GREEN-AMR-G

XMMEPICMOS

0108860701 – centre masked out

BLUE-CCF

GREEN-AMR-F

BLUE-CCF

GREEN-AMR-G

XMMEPICMOS

0112320201

BLUE-CCF

GREEN-AMR-F

BLUE-CCF

GREEN-AMR-G

XMMEPICMOS

Source-search with AMR-‘F’ CCFs:

0032141201

AMR-F v current

XMMEPICMOS

Source-search with AMR-‘G’ CCFs:

0032141201

AMR-G v current

XMMEPICMOS

Histogram of Ratio of Source counts

Current CCF/AMR CCF

(i.e. if CCF believed should be ~1)

AMR values larger

But G-parameters closer to current CCF

XMMEPICMOS

Histogram of Ratio of Source flux

Current CCF/AMR CCF

AMR values larger

But G-parameters closer to current CCf

XMMEPICMOS

Pause and take stock…

F (simpler) PSFs better at finding sources?

G (more data, less noisy) PSFs better at parameterizing sources?

Add more data… Improve G PSFs…

How about having 2 sets of images in CCF? AMR-F-like images to find the sources, and, once found, present CCF images or best AMR-‘z’ images to parameterize sources? Possible?

– Asked GL.

… first, an unusual problem…

XMMEPICMOS

MOS1 (or pn)

Point source has no obvious ‘shape’ – it is circularly symmetric

Off-axis versions are stretched tangentially

Off-axis PSFs (at a particular off-axis angle) are all the same shape – can be rotated and stacked

XMMEPICMOS

Point source has an obvious ‘shape’ – it is not circularly symmetric

Off-axis versions are stretched tangentially

Off-axis PSFs (at a particular off-axis angle) are all of different shape – cannot be rotated and stacked

Unless one has several bright sources at every point on the MOS2 detector, one must sacrifice either stretch or (orientation of) shape.

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

‘H’

Energy

Off-axis angle

M1 More Data, improved BG subtraction, noise reduction, stacking… improved rotation (esp. M2)- Set ‘H’

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

‘H’

Energy n.b. M2 shape retained…

Off-axis angle

XMMEPICMOS

Energy

Off-axis angle

‘F’

XMMEPICMOS

‘H’

Energy

Off-axis angle

XMMEPICMOS

Histogram of Ratio of Source counts

Current CCF/AMR CCF

AMR values larger

XMMEPICMOS

Histogram of Ratio of Source flux

Current CCF/AMR CCF

AMR values larger

XMMEPICMOS

arfgen works with AMR PSF CCF

F, G, H PSFs successively getting closer to extended ARF

XMMEPICMOS

3 2 1 4 5 6

12 11 10 7 8 9

Slew Direction

SlewX DETX = SlewY DETY =

Slew and Slow-Slew

-Can stack 2-D images at different detector positions to create (slow-)slew PSFs

(Last CAL meeting)

XMMEPICMOS

• MOS2

• 3x3 mode

• slew-speed=30°/hr

• 12“ PSF blurring

• NB: easy to create equivalent 10 deg/hr CCF PSFs

• Outer parts of PSF due to off-axis PSFs

• Inner parts of PSF due to frameblurring (note frameblurring far less at 10 deg/hr)

XMMEPICMOS

XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL Meeting (OCB) Palermo 11-13/04/07 XRT Point...

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