Experience with combined Fe55 / Tycho SNR calibration

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RESULTS FROM TYCHO SNR CALMEDIUM OBSERVATION

Presentation transcript:

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

Experience with combined Fe55 / Tycho SNR calibration General plan: start with ‘normal’ Tycho observation add the internal calibration source finish with ‘normal’ calclosed observation does the internal calibration source disturb the Tycho observation ? does Tycho disturb the calclosed measurement ? 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

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

all energy bands centered on Mn-K 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 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..