Chandra X-Ray Observatory
CXC
1. Comparison of RGS Model for
1E0102.2-7219 to the HETG data
2. BI CCD CTI Correction for ACIS
Paul Plucinsky, Dan Dewey,
& Joseph DePasquale
Paul Plucinsky
1
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
Gratuitous Pretty Pictures of E0102
S3 Summed Data ~100 ks
RGS Spectrum (Pollock 2006)
Objective: develop a spectral model which can be used by RGS, HETG,
EPIC & ACIS, etc.
Paul Plucinsky
2
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
What’s New Since the Iceland 2006 Meeting?
• Pollock’s model based on the RGS data has been used by Dan
Dewy of the HETG team to compare to the HETG data
• Dan adopted the RGS spectral model, including the normalizations
• Dan developed a spatial model for the structure of the remnant
• He created simulated datasets to compare the against the MEG
and HEG data from the Chandra HETG
The overall agreement is encouraging !!!
• Good agreement on the bright lines, some disagreement on the
weaker lines
All of the following work has been done by Dan,
many thanks !!!
Paul Plucinsky
3
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
Dewey Spatial and Spectral Model
Paul Plucinsky
4
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
MEG minus
1st order
MgXI
NeX NeIX
OVIII
OVII
Simulation
Comparison
KS test
Paul Plucinsky
5
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
MEG plus
1st order
MgXI
NeX NeIX
OVIII
OVII
Simulation
Comparison
KS test
Paul Plucinsky
6
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
HEG minus
1st order
MgXI
NeX NeIX
Simulation
Comparison
KS test
Paul Plucinsky
7
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
HEG plus
1st order
MgXI
NeX
NeIX
Simulation
Comparison
KS test
Paul Plucinsky
8
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
Where Do We Go From Here ?
• Dewey analysis needs to be updated with latest response files for
HRMA/ACIS/HETG
• Line-based analysis needs to be updated with the latest response
files for HRMA/HETG/ACIS
• RGS data need to be re-analyzed with new background model for
RGS
• RGS and HETG teams agree on a model well before the IACHEC
meeting in California
• ACIS, MOS, and pn use the new model to fit the CCD spectra
Paul Plucinsky
9
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
2. CTI Correction in CIAO for S3 and S1
• Penn State CTI corrector available since 2001
• CXC response products for S1 and S3 used a position-dependent
gain correction which recovers the true values of the PHs but does
not improve the spectral resolution
• S3 and S1 data will now be CTI-corrected in the events files
provided to GOs
• All TEN CCDs will be CTI-corrected as of CIAO and CALDB
release in December 2006
• small, but significant improvement in spectral resolution and QE
uniformity
Paul Plucinsky
10
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
BI CTI correction: PH vs. Row #
Current CALDB: no CTI correction
Paul Plucinsky
Prototype CALDB: CTI correction
11
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
BI CTI correction: PH vs. Row #
Paul Plucinsky
12
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
S3 CTI correction: Mn-K at the Aimpoint
No CTI
correction:
FWHM~162 eV
With CTI
correction:
FWHM~151 eV
Paul Plucinsky
13
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
S3 CTI correction: Mn-K at the Top
No CTI
correction:
FWHM~182 eV
With CTI
correction:
FWHM~157 eV
Paul Plucinsky
14
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
Current
CALDB
No CTI
correction:
E0102 on
S3
Red Chi=
1.44
Paul Plucinsky
15
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
BI CTI
correction:
E0102 on
S3
Red Chi=
1.10
Paul Plucinsky
16
EPIC Cal October 2006
Chandra X-Ray Observatory
CXC
BI CTI
correction:
E0102 on
S1
Red Chi=
1.57
Paul Plucinsky
17
EPIC Cal October 2006