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XMM-Newton 1 M.Stuhlinger, ESAC MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009.

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Presentation on theme: "XMM-Newton 1 M.Stuhlinger, ESAC MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009."— Presentation transcript:

1 XMM-Newton 1 M.Stuhlinger, ESAC MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009

2 XMM-Newton 2 M.Stuhlinger, ESAC Discovery history: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features.

3 XMM-Newton 3 M.Stuhlinger, ESAC Different spectra extractions cause different appearance

4 XMM-Newton 4 M.Stuhlinger, ESAC Discovery history: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features. Where do “my” low energy counts come from? Columns show noise component shifted to lower energies with increasing RAWX.

5 XMM-Newton 5 M.Stuhlinger, ESAC 1E

6 XMM-Newton 6 M.Stuhlinger, ESAC 1E RAWX320RAWX321RAWX323RAWX324RAWX325RAWX322

7 XMM-Newton 7 M.Stuhlinger, ESAC Discovery: During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E looks very different to MOS2/pn at low energies. Same spectrum extracted by Carlos Gabriel agrees with MOS2 and does not show low energy features. Where do “my” low energy the counts come from? Columns show noise component shifted to lower energies with increasing RAWX. Why the difference? We both exclude the hot column RAWX=319. Carlos used RAWX [300:316] (left PSF wing only), I used RAWX [300:317] or [321:330] (both PSF wings with gap).

8 XMM-Newton 8 M.Stuhlinger, ESAC 1E pixels to be ignored

9 XMM-Newton 9 M.Stuhlinger, ESAC MOS1 1E (rev.1065): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

10 XMM-Newton 10 M.Stuhlinger, ESAC MOS1 Swift J (rev.1152): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

11 XMM-Newton 11 M.Stuhlinger, ESAC MOS1 4U (rev.1300): PI versus RAWX RAWX 323 RAWX 322 RAWX 324 RAWX 325 RAWX 321 RAWX 319 RAWX 320 RAWX PI

12 XMM-Newton 12 M.Stuhlinger, ESAC Conclusions: Noise echo of meteorite column in RAWX [320:325] is common feature in MOS1 timing modes. Most probable noise echo is created within serial readout process. For extraction of MOS1 timing mode spectra (Rev.>961): Better ignore RAWX [318:325] Large fraction of the right (higher RAWX values) PSF wing is lost! Already recommended: Avoid MOS1 observations in timing mode.


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