xmm 1 mos2 ccd5 anomaly status of the investigations
Post on 20-Dec-2015
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![Page 1: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/1.jpg)
1Martin Stuhlinger, ESAC
XMM
MOS2 CCD5 anomaly
Status of the investigations.
![Page 2: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/2.jpg)
XMM-Newton
2
Martin Stuhlinger, ESAC
Detection of the problem
• Maite Ceballos and Jean Ballet discovered a large excess of counts <1 keV in MOS2 CCD5.
• Effect stops abruptly at about 1keV.
• Effect appears quite often.
• Jean Ballet informed ESAC.
Rev. 891: MOS2 - 200-500 eV
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XMM-Newton
3
Martin Stuhlinger, ESAC
Facing the beast
Out-FOV region MOS2 CCD5
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XMM-Newton
4
Martin Stuhlinger, ESAC
How to find other observations
• Compare CCD5 count rates with rates of other peripheric CCDs.
• Analyse out-FOV area to exclude effects of different sky regions (field sources) and backgrounds.
• Compare count rate ratios of individual CCD to the mean count rate to avoid wrong detections due to border effects of out-FOV area.
• Exclude 2 CCDs with highest count rates from mean count rate.
• Verify that this scheme is working correctly.
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XMM-Newton
5
Martin Stuhlinger, ESAC
Out-FOV border effects
Rev. 919 MOS2
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XMM-Newton
6
Martin Stuhlinger, ESAC
Scanning the archive: MOS2
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XMM-Newton
7
Martin Stuhlinger, ESAC
Scanning the archive: MOS1
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XMM-Newton
8
Martin Stuhlinger, ESAC
Examples: MOS2 CCD5 + CCD2
![Page 9: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/9.jpg)
XMM-Newton
9
Martin Stuhlinger, ESAC
Examples: MOS2 CCD5 with 2 steps
![Page 10: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/10.jpg)
XMM-Newton
10
Martin Stuhlinger, ESAC
Examples: MOS1 CCD4
![Page 11: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/11.jpg)
XMM-Newton
11
Martin Stuhlinger, ESAC
Examples: MOS1 CCD5
![Page 12: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/12.jpg)
XMM-Newton
12
Martin Stuhlinger, ESAC
Triggered by high radiation?
![Page 13: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/13.jpg)
XMM-Newton
13
Martin Stuhlinger, ESAC
Triggered by high radiation? Unlikely!
![Page 14: XMM 1 MOS2 CCD5 anomaly Status of the investigations](https://reader036.vdocuments.us/reader036/viewer/2022062313/56649d4d5503460f94a2be73/html5/thumbnails/14.jpg)
XMM-Newton
14
Martin Stuhlinger, ESAC
Search for correlation with HK parameter
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XMM-Newton
15
Martin Stuhlinger, ESAC
Conclusions
• MOS2 CCD5 effect is present from begin of the mission.
• (Short) phases in the past, continuously present since rev. 874.
• Effect also found in other CCDs of MOS1 and MOS2.
• So far no switch on/off detected within an observation.
• No occurrence of strange event pattern.
• No correlation with radiation monitors.
• Started to correlate with HK parameters.
• Perfect addition to the EPIC anomaly gallery.