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Timing Mo de low-energy background (OCR-1762)
Michael Freyb erg, Vadim Burwitz, MPE

Motivation (status June 2006):
· for analysis of serendipitous science (not only!) or faint sp ectral features there should b e detailled knowledge on camera background (e.g., in onon-optimum instrument mo de set-up) · camera background obtained with Closed filter · minimum accumulated time p er mo de: length of maximum exp osure (i.e. 1 revolution) · LW mo de: 136 ks, SW mo de: 174 ks, TI mo de: 57 ks so far · use one calibration observation with a sub ject not useful otherwise for EPICpn for a TI mo de Closed filter observation · next "p ossible" case: NRCO-63: MOS-1 filter check, Omega Cen: has already b een observed after (0307 0112220101 PNS003) the EPIC-pn micrometeorite event (0156 0095810401 PNS003), no obvious (!) indication of damage of the Medium filter
MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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OCR-1762: idea of setup
· Main idea: calibration measurement without loss of scientific observing time i.e. no additional load on calibration budget · Take a serendipituous (non EPIC-pn) calibration observation: NRCO-63: 1227 0412780101 (2006-08-21), 20 ks · TI mo de Closed filter exp osure: normal set-up (lower threshold 40 adu 200 eV): 10 ks · TI mo de Closed filter exp osure: changed set-up (lower threshold 36 adu 180 eV): 10 ks · within SAS b oth exp osures can b e treated the same: parameter lowerthreshold=40 in task epframes · information from non-standard set-up "for free" (i.e., low-energy background) · no additional offset map calculation in b etween · Lower threshold: 40 [adu] (A1 CMLOTH0: F1615=552) 36 [adu] (A1 CMLOTH0: F1615=548): OCR needed

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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OCR-1762: feasibility

· 0644 0125321001 PNS010: TI Closed, 12.8 ks, 40 adu · total rate (incl. MIPs, imp ortant for telemetry): 77.5 cts/s · parameterization of low-energy sp ectrum by: p ower-law (index = -2.79 (fit to channel range 70 - 200 adu), and Gaussian (40 - 51 adu). · Extrap olating from 40 adu to 36 adu: exp ected total rate: 194 cts/s · maximum rate without counting mo de: > 400 cts/s · : 1227 0412780101 PNU002: 187 cts/s

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: overview of Closed filter exp osures

Observation-ID 0503 0125910901 0598 0105262401 0644 0125321001 0683 0154150401 0817 0165160201 0820 0165160301 Total PNS014 PNS003 PNS010 PNS003 PNS003 PNS003

Time [s] 10998 8603 12790 5184 9686 9684 56945

Obs-Start 2002-09-07T20:11:32 2003-03-15T14:51:07 2003-06-15T08:44:58 2003-09-01T05:28:19 2004-05-26T21:40:02 2004-05-31T11:51:37

Rate 40 Rate 36 [cts/s] [cts/s] 75.5 180.2 79.2 192.4 77.5 194.1 83.8 228.8 86.5 175.2 89.2 211.1 82 200

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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EPIC-pn: Timing mo de raw sp ectra (no pattern recognition)

0644 0125321001 PNS010 Closed: raw (black ), fit to p ower-law comp onent (red), residual (blue), Gauss low-energy comp onent (green). N132D (dashed magenta), Vela X-1 (dashed cyan),yellow: EPIC-pn FM1 (PANTER, 1 adu 5.3 eV).
MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0503 0125910901 PNS014

Sp ectrum and two-comp onent low-energy fit for 0503 0125910901 PNS014. Measured total rate (40 adu), extrap olations for lowered thresholds 39 ... 30 adu.
MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0598 0105262401 PNS003

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0644 0125321001 PNS010

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0683 0154150401 PNS003

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0817 0165160201 PNS003

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XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 0820 0165160301 PNS003

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 1227 0412780101 PNS001

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XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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TI mo de: 1227 0412780101 PNU002

: movie
MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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OCR-1762: summary + conclusions
· OCR-1762 1227 0412780101 PNU002 successful ! · count rates (dominated by low-energy sp ectral part) as exp ected [187 vs. 194 cts/s] · no unexp ected increase of background b elow default threshold · mayb e general trend, that background increases with time: increasing p ower-law normalization (solar minimum ?)

MF + VB MPE Garching

XMM-Newton EPIC Calibration Meeting, Mallorca, 26 Oct 2006

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