XMM EPIC MOS Andy Read ([email protected]) Background, Operations & Calibration (BOC) meeting...
43
XMM EPIC MOS Andy Read ([email protected]) Background, Operations & Calibration (BOC) meeting Mallorca, 30/03/09-01/04/09 The XRT Point Spread Function Andy Read
XMM EPIC MOS Andy Read ([email protected]) Background, Operations & Calibration (BOC) meeting Mallorca, 30/03/09-01/04/09 The XRT Point Spread Function
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 The XRT Point Spread Function Andy Read
Slide 2
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 The XRT Point Spread Function Andy Read Updates
from previous BOC meeting New developments, remodellings, central
peaks, EBG, triangles & pentagons Migrating into CAL & SAS:
CCF, arfgen et al, - The Full 2-D PSF First tests in SAS &
CAL
Slide 3
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Energy Off-axis angle PN 2XMM source list -
select M1, M2, PN point sources that have large numbers of counts,
are below pile-up limit, cover full range in off-axis angle
(>250 obs) create calibrated event lists Clean event files
(high-BG, out-FOV etc.), extract source, reject bad fields, create
source images (all E-bands, all instruments), subtract other
sources, detector-rotate, Gaussian re-centre Stack good images
together for each instrument (pn, M1, M2), E-band, off-axis angle -
clean, BG-subtract stacked images, re-normalize, create CCF-like
files Improvements in source-detection for bright on- and off-axis
sources Blue: current CCFs Green: New 2-D PSFs EPIC PSF :
Determining the on- and off-axis 2-D PSF
Slide 4
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Energy Off-axis angle PN EPIC PSF : Determining
the on- and off-axis 2-D PSF Spoke non-rotation means that spokes
in theta-phi-corrected stacked images are smeared out and averaged.
These images can be used to parametrize the average PSF model.
Slide 5
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Use AMR-created azimuthally-stacked 2-D PSF
real-data images (for each instrument, energy, off-axis angle) Use
CIAO-Sherpa to fit elliptical + Gaussian profile (beta2d + gauss2d)
to images (central Gaussian to model core) Elliptical (core radius,
alpha, ellipticity [tied]) and Gaussian (FWHM, ellipticity [tied]),
plus relative (G/E) normalization, obtained for each instrument,
energy, off-axis angle CCF files have been produced (RDS) with new
EBG PSF CCF extension Numbers/trends/problems currently being
reviewed (improvements have been [and will be] made) Can be used in
arfgen... New CCF PSF EBG - EllBetaGauss Elliptical (Beta) plus
central Gaussian parametrization of the 2-D PSF
Slide 6
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Example : MOS2 - Rev 301 (MCG-06-30-15) 0.225 keV
King fit Central Gaussian needed to model just the very centre
Slide 7
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Example : MOS2 - Rev 301 (MCG-06-30-15) 0.225 keV
King + Gaussian fit Note normalization ratio ~20% Note Gaussian is
narrow Central Gaussian needed to model just the very centre
Slide 8
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 PSF King+Gaussian 1-D Fitting - Ratio of
normalizations [Gauss/King] versus Energy - M1/M2 : Significant
Gauss component required, at low/medium-E [no Gauss component
required at high-E] - PN : No significant Gauss component required
Central Gaussian needed only for MOS and at low & medium
energies
Slide 9
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 EBG Elliptical (Beta) + central Gaussian
Slide 10
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Calculated Enclosed Energies at various energies
and off-axis angles for 20 and 40 circles from the EBG CCF
parameters MOS1 20 40
Slide 11
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 20 40 Calculated Enclosed Energies at various
energies and off-axis angles for 20 and 40 circles from the EBG CCF
parameters MOS2
Slide 12
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 20 40 Calculated Enclosed Energies at various
energies and off-axis angles for 20 and 40 circles from the EBG CCF
parameters PN
Slide 13
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 20 40 Calculated Enclosed Energies at various
energies and off-axis angles for 20 and 40 circles from the EBG CCF
parameters SCISIM (CCF MEDIUM same for all EPIC instruments)
Slide 14
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 First good set of model parameters (core radius
[E], slope [E], ellipticity [E&G], FWHM [G], normalization
ratio [G/E]) estimated for each EPIC instrument (3), off-axis angle
(6) and energy (8) First CCFs (M1, M2, pn) have been created (AMR
-> RDS) CAL software/calls essentially completed calls need to
be included in SAS tasks arfgen able to work with
optimally-selected elliptical regions, and with EBG
parameterization (RDS) First tests of arfgen usage, enclosed
energies obtained, fluxes obtained - all in progress Hopefully full
EBG system by next major SAS release Status EBG
Parametrization
Slide 15
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 EBG Parameters in CCF Files
Slide 16
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 1 st study of 24 off-axis point sources (M.
Guainazzi, R. Saxton, M. Stuhlinger) Comparing flux ratios in
several energy bands: New/Old New: via (optimum) elliptical
spectral extraction (new eregionanlyse), using new arfgen and new
EBG PSF Old: via circular spectral extraction, using arfgen and old
EXTENDED PSF MOS1
Slide 17
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 MOS2 Both MOSs show zero to very small flux
decreases over soft to medium-hard energy ranges. 7-9% decreases
are seen in the hardest energy range (4-10 keV)
Slide 18
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 pn pn shows very small flux increases over soft
to medium-hard energy ranges. 5% decrease is seen in the hardest
energy range (4-10 keV)
Slide 19
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Consistent improvements in the MOS2/pn flux
ratio, with some evidence for similar improvements for MOS1/pn
Large scatter, low stats at very lowest energy so far (See RDS BOC
talk for details on M09 paper)
Slide 20
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 The star-like pattern the spokes is created by
the spider which supports the 58 co-axial Wolter I mirrors of the
telescope The Full 2-D PSF
Slide 21
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Observed spokes are actually due to the gaps
between the spider legs, not the legs themselves, which are
coincident with the secondary spikes and the dark lanes. Without
the spider you would see uniform scattering wings without the
radial gaps.
Slide 22
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Dark lanes? Shadowing must be due to the electron
deflector arms which mirror the spider and are mounted after the
rear aperture. Secondary spokes? Due to scattering at a small level
from the sides of the spider legs.
Slide 23
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 In (PA-corrected) space, the spokes are not
rotated, as the source moves about on the detector i.e. anywhere on
the detector(s), the source spokes keep the same orientations for
all EPIC 16 main spokes 22.5 apart (360/16) Offset of 11.25
(22.5/2) General well-known tangential sagittal-plane stretching
rotates with the source around the detector Spokes and other (to be
seen later) components do not rotate around the detector The PSF of
a source at a particular azimuth is not merely a simple rotation of
the same source at a different azimuth Each point on each EPIC
detector has a unique PSF
Slide 24
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 In an observation, though all the sources are
tangentially distorted at different angles, the spokes from all the
bright sources line up
Slide 25
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 From EBG to the Full 2-D PSF Stacked images in
general work well in emldetect Can model these images (and have
done - EBG) Can create idealized images from these models (EBG
image, example shown right) These however have a smeared azimuthal
dependence (created from several sources at different azimuths)
Need to (in CAL/CCF/emldetect): choose/create the correct EBG image
(instrument, off-axis angle, energy) rotate the EBG image for the
detector position of the source factor in the known azimuthal
(spokes etc.) dependence i.e. filter the EBG image azimuthally,
retaining overall profile, and including correct angles, offsets,
spoke sizes etc Finally, filter in (via similar method) any gross
azimuthal filtering (e.g. the MOS2 triangle)
Slide 26
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Flat-Topped Triangular Function spoke 22.5 1.00
0.18 Estimated (from the data) widths of various components Profile
needs to be such that no change is introduced to the full (360)
radial profile i.e. areas need to cancel out X Y H 1.00 2 2X + Y H
= 1
Slide 27
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09
Slide 28
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Look at the gross azimuthal properties... e.g.
The MOS2 triangle Certain (sets of) MOS2 mirror shells are not
perfectly circular It is a mirror effect, like the spokes, and does
not rotate with position on the detector
Slide 29
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 MOS2 = 0 Strong effect! (45%) 3-peaked cosine
function fits well (peaks at 50, 170, 290) 45% of mean
Slide 30
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 MOS1 13% of mean Much weaker (~13%) 5-peaked
pentagon function (cosine) (62, 134, 206, 278, 350)
Slide 31
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 PN Nothing seen (yet) in pn
Slide 32
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Point Spread Function: Six stages towards a full
2-D PSF MOS1MOS2 [1] Ell. PSF at given off-ax angle/energy [2]
Central Gauss peak (off-ax/en) [3] Combine 1+2 [4] Rotate to
correct source PA [5] Az-filter spoke structure [6] Az-filter gross
azimuthals EBG
Slide 33
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Energy Off-axis angle M1
Slide 34
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Energy Off-axis angle M2
Slide 35
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Energy Off-axis angle PN
Slide 36
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Uses EBG parameterization as seed hence needs EBG
system & CAL to be already in place it is Requires very large
software migration and updates to CAL (completed) &
SAS/emldetect (first stages) First pieces of software (IDL) sent
(late 08) to RDS First full set of code sent early 09 First SAS/CCF
version appearing ~now (e.g. calview/psfgen can create full 2-D
PSF) Only when in place can any sensible testing be started
(source- detection, source parameterization etc. SSC/SOC to perform
testing) If no major problems, may have a first beta version in
place by next major SAS release but, some problems... Status Full
2-D PSF
Slide 37
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Full 2-D PSF some initial problems...
Slide 38
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Full 2-D PSF ...now looking good AMR CAL
AMR/CAL
Slide 39
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Full 2-D PSF ...now looking good AMR CAL AMR/CAL
Moir-like interference pattern actually in AMR image
Slide 40
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Full 2-D PSF ...now looking good Full 2-D PSF now
in CAL accessible via e.g. calview
Slide 41
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09
Slide 42
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 Georg/AIP to incorporate into emldetect and
perform testing idea is to make ELLBETA (EBG) PSF an option in
emldetect, with the default still set to MEDIUM SSC to test
emldetect with ELLBETA over many fields (all types normal, crowded,
problem fields) compare results Continuing spectral tests (ESAC) of
bright off-axis (and on-axis) sources with arfgen and ELLBETA
Rigorous spectral analysis of bright sources using complex models
and various extraction 'radii' (Future) Re-stacking, re-modelling
of more data to obtain better EBG parameters update CCFs especially
at high-energies... Full 2-D PSF Testing...
Slide 43
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 MOS events spread across the RGS dispersion axis
Is this a PSF issue? Out-of-time events? Is this a PSF issue? Some
proper handling of the Sagittal-Meridional effect (off-axis and
energy dependent) Azimuthal phi-dependence of the EBG parameters?
e.g. RGA obscuration, individual chip-to-chip height variations
Pentagon in pn? Dark lanes electron deflector?... Full 2-D PSF The
Far Future...
Slide 44
XMM EPIC MOS Andy Read ([email protected]) Background,
Operations & Calibration (BOC) meeting Mallorca,
30/03/09-01/04/09 End