Experience with combined Fe
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Experience with combined Fe 55 / Tycho SNR calibration PowerPoint PPT Presentation


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Experience with combined Fe 55 / Tycho SNR calibration. NRCO 71. EPIC Calibration & Operations Meeting. Mallorca, Spain, 2008 April 7 - 8. Internal calibration source onboard XMM-Newton / EPIC-pn. Al-K Mn-K. 30 ks in 2000  210 ks in 2008.

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Experience with combined Fe 55 / Tycho SNR calibration

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Experience with combined Fe55 / Tycho SNR calibration

NRCO 71

EPIC Calibration & Operations Meeting

Mallorca, Spain, 2008 April 7 - 8


Internal calibration source onboard XMM-Newton / EPIC-pn

Al-K Mn-K


30 ks in 2000

 210 ks in 2008

30 ks

10 ks


does the internal calibration source disturb the Tycho observation ?

does Tycho disturb the calclosed measurement ?

Experience with combined Fe55 / Tycho SNR calibration

  • General plan:

  • start with ‘normal’ Tycho observation

  • add the internal calibration source

  • finish with ‘normal’ calclosed observation

  • Unfortunately, this sequence was scheduled as three independent observations, performed in a non-contiguous mode

  • superposition with short-term changes in the absolute energy scale

  • no firm conclusions about potential changes of the absolute energy scale possible

  • however: general idea about ‘calopen’ observations


Experience with combined Fe55 / Tycho SNR calibration

1) Tycho FF Medium, 2007-12-30 / 19:55 – 2007-12-31 / 03:37, 27 ks


Experience with combined Fe55 / Tycho SNR calibration

2) Tycho FF Cal Medium, 2008-01-01 / 19:58 – 2008-01-02 / 09:59, 50 ks


Experience with combined Fe55 / Tycho SNR calibration

3) Calclosed, 2008-01-03 / 01:06 – 2008-01-03 / 08:11, 25 ks


1) Tycho FF Medium, 2007-12-30 / 19:55 – 2007-12-31 / 03:37, 27 ks


2) Tycho FF Cal Medium, 2008-01-01 / 19:58 – 2008-01-02 / 09:59, 50 ks


3) Calclosed, 2008-01-03 / 01:06 – 2008-01-03 / 08:11, 25 ks


5.75 6.00 keV

adu

Narrow-line images at Mn-K: 5.70 – 6.05 keV

ΔE = 350 eV


Narrow-line images at Mn-K: 5.70 – 6.05 keV

scaled to the same exposure time

ΔE = 0.35 keV

Tycho CalClosed Tycho + CalClosed


Tycho + CalClosed

all energy bands centered on Mn-K

ΔE = 0.35 keV

ΔE = 1.0 keV

ΔE = 2.0 keV

ΔE = 5.0 keV


Narrow-line images at Al-K: 1.375 – 1.575 keV

1.25 1.50 1.75 keV

adu

ΔE = 200 eV


Narrow-line images at Al-K: 1.375 – 1.575 keV

scaled to the same exposure time

ΔE = 0.20 keV

Tycho CalClosed Tycho + CalClosed


calclosed


Tycho


Tycho + calclosed


Mn-K

calclosed


Mn-K

Tycho + calclosed


Al-K

calclosed


Al-K

Tycho + calclosed


CTI determination: Illustration of the Template Cross Correlation method (EPIC pn)

25 macro pixels,

20-29 singles per macro pixel


calclosed

CTI


Tycho + calclosed

CTI


Tycho + calclosed

CTI


Experience with combined Fe55 / Tycho SNR calibration

  • Tycho + calclosed seems ok for Mn-K, but not for Al-K

  • Tycho better suited for LW than for FF

  • Calclosed & LW no useful combination

 are there celestial calibration targets which are better suited for a combined Fe55 exposure ?


Vela SNR


Vela SNR (62 ks)


calclosed (25 ks)


Vela SNR + calclosed (scaled to 62 ks)


Experience with combined Fe55 / Tycho SNR calibration

  • Vela + calclosed might be an interesting alternative:

  • the parts of the Vela SNR covered by the FOV are similarly extended as the internal calibration source

  • the X-ray surface brightness of the Vela SNR is similar to that of the internal calibration source

  • the X-ray spectrum of the Vela SNR is almost complementary to that of the internal calibration source

  • But the Al-K region would need to be checked in detail..


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