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EPIC

ESAC

Energy calibration refinement of EPIC-pn eFF mode and verification of energy calibration of all EPIC modes

XMM-EPIC Operations and Calibration Meeting 1st February 2005

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 1


Overview
·

EPIC

ESAC

Analyze a special observation of the supernova remnant Cas-A in order to refine the energy cross-calibration of the EPIC-pn extended Full Frame mode (eFF) with respect to the Full Frame mode (FF) Analyze observations of Cas-A and N132D from different revolutions in order to verify the agreement in energy calibration between modes Analyze CalClosed observations to check the energy line position for Al and Mn lines

·

·

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 2


General data analysis

EPIC

ESAC

·

Extract spectra of the targets for
- Different mode - Different revolution

·

Determine and compare line positions

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 3


Outline of the eFF Vs FF calibration
· The extended Full Frame mode showed an overcorrection for the onboard calibration source at Al and Mn energies compared to the Full Frame mode · A special observation of Cas A was performed in order to measure and correct these differences in a wider range of energy · Ratio of line positions between eFF and FF modes were calculated and used to derive a correction function to be implemented into SAS and in a new Current Calibration File (EPN_CTI_0014.CCF)

EPIC

ESAC

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 4


Ratio of line positions: Cas-A
Ratio eFF/FF Vs Energy
1.006 1.004 1.002 1

EPIC

ESAC

Ratio

0.998 0.996 0.994 0.992 0.99 0 1 2 3 4 5 6 7

Red: before correction

Energy eFF (KeV)

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 5


Information from cal source

EPIC

ESAC

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 6


Calibration of eFF Vs FF mode: correction function
Energy eFF (KeV) Al-K Si XIII S XV Ar XVII Ca XIX Mn-K Fe XXV 1.47649 1.86454 2.46067 3.13805 3.89890 5.91143 6.60701 Energy FF (KeV) 1.47072 1.85800 2.45355 3.12881 3.90339 5.90290 6.59980 Ratio FF/EFF 0.99608975 0.99649243 0.99710648 0.99705550 1.00115161 0.99855595 0.99877860

EPIC

ESAC

Energy eFF * f(E) = Energy eFF

corrected

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 7


Verification of correction: Cas-A
Ratio eFF/FF Vs Energy
1.006 1.004 1.002 1

EPIC

ESAC

Ratio

0.998 0.996 0.994 0.992 0.99 0 1 2 3 4 5 6 7

Red: before correction Green: after correction

Energy eFF (KeV)

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 8


Verification of correction: cal source

EPIC

ESAC

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 9


Calibration of eFF Vs FF mode
Ratio eFF/FF Vs Energy
1.006 1.004 1.002

EPIC

ESAC

| Difference %| Before correction Al -K Si XIII S XV Ar XVII Ca XIX Mn-K
0 1 2 3 4 5 6 7

| Difference % | After correction 0.06 0.10 0.08 0.01 0.51 0.04 0.13

Ratio

1 0.998 0.996 0.994 0.992 0.99

0.39 0.35 0.29 0.29 0.12 0.14 0.12

Fe XXV

Energy eFF (KeV)

Red: Cas-A data before correction Green: Cas -A data after correction Triangle: internal calibration source

eFF energy calibration agrees with FF within ~0.1% (before 0.4%)
M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 10


General verification of energy calibration
· PN camera
· · FF mode stability: Cas -A Different PN modes:
· · · · eFF/FF: Cas-A LW/FF: Cas-A & N132D SW/FF: Cas-A & N132D Timing/FF: Cas-A

EPIC

ESAC

·

MOS cameras
· · LW mode stability: N132D Different MOS modes:
· LW/FF: N132D FF mode: N132D

·

MOS & PN cameras
·

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 11


PN camera: FF mode stability.
Cas-A

EPIC

ESAC

1.004 1.002 1

FF comparison

Ratio

0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV)

Rel. Accuracy in line energy determination ~0.1%

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 12


Different pn modes.
PN camera: eFF Vs FF 1.004 1.002 1
Ratio

Cas-A & N132D
PN camera: SW Vs FF 1.004 1.002 1

EPIC

ESAC

Ratio

0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV) CasA_eFF(836)/FF(836) Int Cal Source_eFF/FF

0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV) CasA_SW(312)/FF(116) N132D_SW(341)/FF(474)

eFF Vs FF: ~0.1%
PN camera: LW Vs FF 1.004 1.002 1 0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV) CasA_LW(308)/FF(116) N132D_LW(474)/FF(474) 1.004 1.002 1

SW Vs FF: ~0.4%
PN camera: Timing Vs FF

Ratio

Ratio

0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV) CasA_Timing(312)/FF(312)

LW Vs FF: ~0.1%

Timing Vs FF: ~0.2%
M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 13


Summary of agreement between different pn modes
PN camera
1.004 1.002 1
Ratio

EPIC

ESAC

0.998 0.996 0.994 0.992 0 1 2 3 4 5 6 7 Energy line position (KeV) CasA_SW(312)/FF(116) Int Cal Source_eFF/FF CasA_LW(308)/FF(116) N132D_LW(474)/FF(474) CasA_Timing(312)/FF(312) N132D_SW(341)/FF(474) CasA_eFF(836)/FF(836)

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 14


MOS cameras: LW mode stability.N132D
N132D. MOS1_LW. Ratio revs 283, 474, 771 Vs rev 83
1.025 1.02 1.015
Ratio

EPIC

ESAC

MOS2_LW. Ratio revs 283, 474, 771 Vs rev 83
1.025 1.02 1.015
Ratio

1.01 1.005 1 0.995 0.99 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Energy line position (KeV) rev 283/83 rev 474/83 rev 771/83

1.01 1.005 1 0.995 0.99 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Energy line position (KeV) rev 283/83 rev 474/83 rev 771/83

Rel. accuracy in line energy determination ~0.5%

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 15


MOS cameras: LW Vs FF.
N132D
MOS1 & MOS2 cameras
1.025 1.02 1.015 1.01
Ratio

EPIC

ESAC

1.005 1 0.995 0.99 0.985 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Energy line position (KeV) MOS1_LW(83)/FF(83) MOS2_LW(83)/FF(83)

Rel. accuracy in line energy determination ~0.5%

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 16


MOS Vs PN.
1.025 1.020 1.015
Ratio mos/pn

N132D

EPIC

ESAC

FF/Med all cameras

1.010 1.005 1.000 0.995 0.990 0.985 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Mos energy line positions (KeV) 1.003 0.999 0.994
1.001

1.003

1.000

mos1/pn

mos2/pn

Agreement between cameras: ~0.4%

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 17


CalClosed observations: absolute energy calibration
Cal Closed: Al line
1.505 5.925

EPIC

ESAC

Cal closed: Mn alpha line

Energy line position (KeV)

Energy line position (KeV)

1.5 1.495 1.49 1.485 1.48 1.475 1.47 1.465 0 100 200 300 400 Revolution
Mos1_patt<=4 Mos2_patt<=4 Pn_patt<=4

5.92 5.915 5.91 5.905 5.9 5.895 5.89 5.885 0 100 200 300 400 Revolution
Mos1_patt<=4 Mos2_patt<=4 Pn_patt<=4 Pn_patt=0,patseq=0 Pn_patt=0,2,4

1.486 KeV

5.896KeV

500

600

700

800

500

600

700

800

· Al line: all cameras agree in line energy · Mn line: MOS cameras agree in line energy but for pn doubles (1,3) slight overcorrection

M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 18


Results

EPIC

ESAC

· Energy determination in eFF mode will change by up to ~0.4% using the newest SAS (6.1.0) getting an accuracy of ~0.1% with respect to the FF mode · Relative energy calibration pn (1-6 keV)
­ pn: 0.1% (0.4% SW)

· Relative energy calibration MOS (0.5-2 keV)
­ MOS: 0.5 %

· Absolute energy calibration
­ MOS: 0.3 % (Al), 0.1 % (Mn) ­ pn: 0.3 % (Al), 0.2 % (Mn)
M. Pilar Esquej , XMM- Newton European Space Astronomy Centre Page 19