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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 fe 55 tycho snr calibration

Experience with combined Fe55 / Tycho SNR calibration

NRCO 71

EPIC Calibration & Operations Meeting

Mallorca, Spain, 2008 April 7 - 8


Experience with combined fe 55 tycho snr calibration

Internal calibration source onboard XMM-Newton / EPIC-pn

Al-K Mn-K


Experience with combined fe 55 tycho snr calibration

30 ks in 2000

 210 ks in 2008

30 ks

10 ks


Experience with combined fe 55 tycho snr calibration

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 fe 55 tycho snr calibration

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 fe 55 tycho snr calibration

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 fe 55 tycho snr calibration

Experience with combined Fe55 / Tycho SNR calibration

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


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

5.75 6.00 keV

adu

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

ΔE = 350 eV


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

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

1.25 1.50 1.75 keV

adu

ΔE = 200 eV


Experience with combined fe 55 tycho snr calibration

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


Experience with combined fe 55 tycho snr calibration

calclosed


Experience with combined fe 55 tycho snr calibration

Tycho


Experience with combined fe 55 tycho snr calibration

Tycho + calclosed


Experience with combined fe 55 tycho snr calibration

Mn-K

calclosed


Experience with combined fe 55 tycho snr calibration

Mn-K

Tycho + calclosed


Experience with combined fe 55 tycho snr calibration

Al-K

calclosed


Experience with combined fe 55 tycho snr calibration

Al-K

Tycho + calclosed


Experience with combined fe 55 tycho snr calibration

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

25 macro pixels,

20-29 singles per macro pixel


Experience with combined fe 55 tycho snr calibration

calclosed

CTI


Experience with combined fe 55 tycho snr calibration

Tycho + calclosed

CTI


Experience with combined fe 55 tycho snr calibration

Tycho + calclosed

CTI


Experience with combined fe 55 tycho snr calibration

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 ?


Experience with combined fe 55 tycho snr calibration

Vela SNR


Experience with combined fe 55 tycho snr calibration

Vela SNR (62 ks)


Experience with combined fe 55 tycho snr calibration

calclosed (25 ks)


Experience with combined fe 55 tycho snr calibration

Vela SNR + calclosed (scaled to 62 ks)


Experience with combined fe 55 tycho snr calibration

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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