Fitting pn and MOS data with the IACHEC Models for E0102 ... · The IACHEC model for E0102 is the result of years of work by the members of this group. Chandra X-ray Observatory CXC

CXCChandra X-ray Observatory

Paul Plucinsky EPIC Cal/Ops 2017

Fitting pn and MOS data with the IACHEC Models for E0102 and N132D

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IACHEC Thermal SNR Working Group One of the “Standard candle” working groups. Many thanks to the WG members:

XMM-Newton RGS Andy Pollock(Sheffield), Martin Stuhlinger (ESAC) XMM-Newton MOS Steve Sembay (Leicester) XMM-Newton pn Frank Haberl (MPE) Chandra ACIS Paul Plucinsky (SAO) Chandra HETG Dan Dewey (MIT) Suzaku XIS Eric Miller (MIT) Swift XRT Andrew Beardmore (Leicester) Models Adam Foster (SAO) ASTROSAT Sunil Chandra (TIFR)

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The IACHEC model for E0102 is the result of years of work by the members of this group.



N132D: X-ray brightest in the LMC 1.7X2.3 arcmin, 25x33.5 pc t ~ 3,000 yr (Morse et al. 1996) LX(0.3-10.0 kev) = 1.0x1038 ergs s-1

no compact object “O-rich” core-collapse SNR

E0102: X-ray brightest in the SMC 0.77X0.77 arcmin, 13X13 pc t ~ 2,000 yr (Finklestein et al. 2006) LX(0.3-10.0 kev) = 2.5x1037 ergs s-1


ACIS 0.35-8.0 keV ACIS 0.35-8.0 keV

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E0102: X-ray brightest in the SMC 0.77X0.77 arcmin, 13X13 pc t ~ 2,000 yr (Finkelstein et al. 2001) LX(0.3-10.0 kev) = 2.5x1037 ergs s-1


ACIS 0.35-8.0 keVRed (0.3-0.5 keV), Green (0.5-0.75 keV), Blue (0.75 – 7.0 keV)

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E0102: X-ray brightest in the SMC 0.77X0.77 arcmin, 13X13 pc t ~ 2,000 yr (Finkelstein et al. 2001) LX(0.3-10.0 kev) = 2.5x1037 ergs s-1


Red (0.3-0.5 keV), Green (0.5-0.75 keV), Blue (0.75 – 7.0 keV)

Red (0.3-0.75 keV), Green (0.8-1.1 keV), Blue (1.1 – 2.0 keV)

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The IACHEC E0102 Paper is Published !Many thanks to Andy B., Adam, Frank, Eric, Andy P. and Steve for their patience



10 15 20 25

10!4

10!3

0.01

0.1

Coun

ts s!

1 cm!2

A!1

Wavelength (A)

OV

II F

OV

II R

OV

III

Ne

IX F

Ne

IX R

Ne

X

RGS Spectra of E0102

E0102

7

Pollock (Sheffield)

Strong well-separated lines in the 0.5-1.0 keV

bandpass make this target attractive for

calibration of CCD instruments

Just a reminder why we use

E0102



Comparison of E0102 Line Normalizations for MOS, pn, ACIS, XIS and XRT

Norm OVII OVIII NeIX NeXMOS and

pn disagree by 5-15% depending on the line,

this is apparently

larger than the

discrepancy suggested by other analyses.



Time Dependence of ACIS S3 on axis in subarray mode

9

IACHEC value

average of data



Time Dependence of pn in small window mode

10

the pn in small window mode on-axis is remarkably

stable

2005 2010 2015

0.9

0.95

11.

05

Line

Rat

io

Year

EPIC pn Small Window ModeSAS 14.0

Ne XNe IXO VIIIO VII

Haberl (MPE)



Time Dependence of MOS in large window mode

11

2000 2002 2004 2006 2008 2010 2012 2014

0.90

0.95

1.00

1.05

1.10

ratio

inst

r/IAC

HEC MOS1

2000 2002 2004 2006 2008 2010 2012 2014Year

0.90

0.95

1.00

1.05

1.10

MOS2

Norm OVII OVIII NeIX NeX

Sembay (Leicester)



Time Dependence of Suzaku XIS

12

Miller (MIT)

Norm OVII OVIII NeIX NeX



Time Dependence of Swift XRT in WT Mode

13

Beardmore (Leicester) Norm OVII OVIII NeIX NeX



- Martin S., Andy P., & Matteo G. worked on an empirical model with Gaussians for the lines similar to what was done for E0102

- 121 Gaussians for the lines identified in RGS data and pn/MOS data - two component absorption, Galactic and LMC - two “no-line” APEC model for the continuum, one with kT=0.175 keV and

the other with 1.14 keV - power-law component for the background - global normalization that modifies the entire model - 403 parameters in the model UGH !!!

N132D IACHEC Model Description

Fitting Methodology- Only 4 free parameters, all others frozen - fit in the 0.3 - 10.0 keV bandpass - Line energies and widths are not allowed to vary - Only the normalization of the Si XIII, S XV, and Ar AVII line are allowed to

vary - the global normalization is allowed to cary - pn spectral fits used the “gainfit” model in XSPEC - detector background is now modeled, not subtracted, Gaetz (SAO) models



N132D ACTION ITEMS FROM 2017 IACHEC

- Andy P. will modify the line widths of some line and change the normalizations of some of the weak lines, we expect the CCD instruments will be insensitive to these changes

- Adam and Paul will process pn and MOS data with SAS16 and analyze those spectra [Done, results presented today]

- Develop a non-linear gain correction for the pn data and apply the correction to the events and do NOT use “gain fit” in XSPEC

- the WG will explore allowing the continuum normalization and shape to vary - the WG will experiment wit different energy ranges over which to fit

N132D IACHEC Model v2.10 Released before the 2017 IACHEC Meeting Significant changes from v2.9 to v2.10: • use APEC v3.0.8 • use “nlapec” model in XSPEC • remove power-law component that was there as a crude background model

Objectives of Model Development Short term: use model to compare effective areas in the 1.5 - 3.5 keV bandpass Long term: develop a standard model for the community to use



“Stringent” Data Selection for MOS

“Stringent” Data Selection for pn • only use PrimeSmallWindow mode to minimize pileup • spectral extraction region is completely enclosed by the Small Window area • only use Thin or Medium filter • low background • no cal source included • no obvious problems with fit to the IACHEC model • 14 of 47 data sets conform with selection criteria

• only use PrimePartialW3 mode to minimize pileup • spectral extraction region is completely enclosed by the Window area • only use Thin or Medium filter • low background • no cal source included • “inner” part of the patch area can NOT intersect spectral extraction region • “outer” part of the patch area can NOT exceed 50% of the spectral

extraction region • 17 of 43 data sets conform with selection criteria



N132D: sample images for data selection

17

included

excluded

excluded

included

inner and outer patch

pn

pn

MOS1

MOS2



N132D: sample pn fits for one observation. Fits in 4 energy ranges are evaluated

18

0.3-10.0 keV

10−3

0.01

0.1

1

10

100

norm

aliz

ed c

ount

s s−1

keV

−1

2000−0523,PrSmWin,Exp=9954.7,Pile=N,Back=6.9e6,Con=0.993,RPchi=0.89,Cstat=2072.9N132D,v2.10,SAS16,pn,0125100201_pnS001,Medium,DETX=70.3,DETY=332.8,DOF=1937.0

1 100.5 2 50.6

0.8

1

1.2

1.4

ratio

Energy (keV)plucinsk 20−Apr−2017 12:43

0

50

100

norm

aliz

ed c

ount

s s−1

keV

−1


0.4 0.6 0.8 1 1.2 1.4

−5

0

5

norm

aliz

ed c

ount

s s−1

keV

−1


0.1

1

10

norm

aliz

ed c

ount

s s−1

keV

−1


1.5 2 2.5 3 3.5

0.5

1

1.5

ratio


10−3

0.01

2×10−3

5×10−3

0.02

0.05

norm

aliz

ed c

ount

s s−1

keV

−1


5.5 6 6.5 7 7.5 80

0.5

1

1.5

2

2.5

ratio


0.3-1.5 keV

1.5-3.0 keV 5.5-8.0 keV



N132D:simultaneous fit to 14 selected data sets

19

pn 0.3-10.0 keV

10−3

0.01

0.1

1

10

100

norm

aliz

ed c

ount

s s−1

keV

−1

PrSmWin,Thin or Med,Con=0.990,RPchi=1.25,Cstat=36979.3,DOF=27170.0N132D,v2.10,SAS16,pn,simultaneously fit 14 selected data sets

1 100.5 2 50.6

0.8

1

1.2

1.4

ratio


instrument background




20

pn 0.3-1.5 keV

0

50

100

norm

aliz

ed c

ount

s s−1

keV

−1


0.4 0.6 0.8 1 1.2 1.4

−5

0

5

norm

aliz

ed c

ount

s s−1

keV

−1





21

pn 1.5-3.5 keV

0.1

1

10

norm

aliz

ed c

ount

s s−1

keV

−1


1.5 2 2.5 3 3.5

0.5

1

1.5

ratio


Si XIII

S XV

Ar XVII




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pn 5.5-8.0 keV

10−3

0.01

2×10−3

5×10−3

0.02

0.05

norm

aliz

ed c

ount

s s−1

keV

−1


5.5 6 6.5 7 7.5 80

0.5

1

1.5

2

2.5

ratio


Linear gain adjustment is driven by low energy data. This makes the fit worse at the Fe-K line. Need a non-linear gain adjustment instrument background



Issues with MOS processing and analysis • for latest reprocessing with SAS16 we used: FLAG==0 and pattern==0 in the evselect extendedsource=yes in arfgen • Sembay recommends FLAG==#XMMEA_EM

How to process the data in the future ?? Sembay suggests two approaches with a suitably large extraction region:

1. use extendedsource=no and FLAG==#XMMEA_EM and accept inaccuracy in bad pixel correction

2. use extendedsource=yes and FLAG==#XMMEA_EM and correct results of the encircled energy fraction



Encircled Energy Fraction for N132D Sembay (Leicester)




25

MOS1 0.3-10.0 keV

10−3

0.01

0.1

1

10

100

norm

aliz

ed c

ount

s s−1

keV

−1


1 100.5 2 50.6

0.8

1

1.2

1.4

ratio


No gain adjustment to the MOS1 data




26

MOS1 0.3-1.5 keV

0

10

20

30

norm

aliz

ed c

ount

s s−1

keV

−1

PrSmWin,Thin or Med,Con=0.991,RPchi=2.53,Cstat=10453.5,DOF=4059.0N132D,v2.10,SAS16,MOS1,simultaneously fit 14 selected data sets

0.4 0.6 0.8 1 1.2 1.4−2

−1

0

1

2

norm

aliz

ed c

ount

s s−1

keV

−1






27

MOS1 1.5-3.5 keV

Si XIII

S XV

Ar XVII

0.1

1

norm

aliz

ed c

ount

s s−1

keV

−1


1.5 2 2.5 3 3.5

0.6

0.8

1

1.2

1.4

ratio






28

MOS1 5.5-8.0 keV


10−4

10−3

0.01

norm

aliz

ed c

ount

s s−1

keV

−1


5.5 6 6.5 7 7.5 80

0.5

1

1.5

2

2.5

ratio




MOS2 Results No MOS2 results from SAS16 processing. The normalizations we are getting for the MOS2 spectra processed with SAS16 with the parameters as we set them are 10-25% different from MOS1.

MOS1 MOS2



N132D: Comparison of Fitted Norms for S XIII, S XV, & Ar XVII

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Norm Si XIII S XV Ar XVII

2017

Shown at the IACHEC, based on single observations for pn and MOS1/MOS2



N132D: Comparison of Fitted Norms for S XIII, S XV, & Ar XVII

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Norm Si XIII S XV Ar XVII 2017

Norm Si XIII S XV Ar XVII

Use pn and MOS1 simultaneous fits



N132D Future Work

- Resolve MOS processing issues and create data sets to use for this analysis - Experiment with allowing the continuum shape and normalization to vary - Decide on the bandpass for the fits and which parameters are free

Documents

Fitting pn and MOS data with the IACHEC Models for E0102 ... · The IACHEC model for E0102 is the result of years of work by the members of this group. Chandra X-ray Observatory CXC