1 / 12

MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009

MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009. Discovery history:. During analyses of MOS1 timing mode exposures. My MOS1 timing mode spectrum of highly absorbed source 1E1740.7-2942 looks very different to MOS2/pn at low energies.

tahir
Télécharger la présentation

MOS1 Timing Mode noise echo of the meteorite column Madrid, 23. March 2009

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  2. Discovery history: • During analyses of MOS1 timing mode exposures. • My MOS1 timing mode spectrum of highly absorbed source 1E1740.7-2942 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. M.Stuhlinger, ESAC

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

  4. Discovery history: • During analyses of MOS1 timing mode exposures. • My MOS1 timing mode spectrum of highly absorbed source 1E1740.7-2942 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 320-327 show noise component shifted to lower energies with increasing RAWX. M.Stuhlinger, ESAC

  5. 1E1740.7-2942 M.Stuhlinger, ESAC

  6. 1E1740.7-2942 RAWX325 RAWX324 RAWX323 RAWX322 RAWX321 RAWX320 M.Stuhlinger, ESAC

  7. Discovery: • During analyses of MOS1 timing mode exposures. • My MOS1 timing mode spectrum of highly absorbed source 1E1740.7-2942 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 322-325 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). M.Stuhlinger, ESAC

  8. 6 pixels to be ignored 1E1740.7-2942 M.Stuhlinger, ESAC

  9. RAWX 320 RAWX 319 RAWX 321 RAWX 322 RAWX 323 PI RAWX 324 RAWX 325 RAWX MOS1 1E1740.7-2942 (rev.1065): PI versus RAWX M.Stuhlinger, ESAC

  10. PI RAWX MOS1 Swift J1753.5-0127 (rev.1152): PI versus RAWX RAWX 320 RAWX 321 RAWX 319 RAWX 322 RAWX 323 RAWX 324 RAWX 325 M.Stuhlinger, ESAC

  11. PI RAWX MOS1 4U0142+61 (rev.1300): PI versus RAWX RAWX 320 RAWX 321 RAWX 319 RAWX 322 RAWX 323 RAWX 324 RAWX 325 M.Stuhlinger, ESAC

  12. 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. M.Stuhlinger, ESAC

More Related