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EPIC

ESAC

Correct treatment of fast mode ARFs

Marcus G. F. Kirsch, G. Schoenherr, E. Kendziorra, M.J. Freyberg
Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 1


menu

EPIC

ESAC

· recap fast mode operations · Extraction region normalization treatment in fast modes · arf generation window versus fast modes

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 2


CCD readout in Timing Mode
CAMEX CAMEX CAMEX
Line 20 - 39 Line 0 - 19

EPIC

ESAC

1st readout 2nd readout

10th readout

Pseudo (macro) CCD:

64 x 200 macro pixel, contains information from 10 real CCD readouts

Line 180- 199

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 3


EPIC-pn Burst Mode

EPIC

ESAC

· Burst Mode
fast transfer of pixels under PSF · time resolution: 7 µs · life time only 3 %

Exposure in Burst Mode

·

· Max. count rate (flux) point source [s-1] ([mCrab]) : 60000 (6300)

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 4


Normalization pre 6.1

EPIC

ESAC

· Arfgen assumed an extraction region with Y-extent: 200(Timing), 180 (Burst)

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 5


Normalization 6.1
·

EPIC

ESAC

Arfgen now scales with extraction region Y-extent: Y/200(Timing), Y/180 (Burst) · Timing mode trivial · Burst mode complicated, because part of PSF is leaking into fast shift recorded events during slow read out

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 6


Situation for Window modes

EPIC

ESAC

· Arfgen takes into account:
­ PSF ­ Vignetting

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 7


Fast modes 6.1

EPIC

ESAC

· Arfgen corrects for Y-extent of extraction region, but still not for PSF (and VignettingЮ straight forward) · PSF:
­ ­ X-direction normal PSF distribution Y-direction: ­ Direction towards CAMEX 99.99 % PSF ­ Direction opposite CAMEX 85 % PSF

Ю2 dim PSF needs to be integrated not averaged

120 arcsec 120 arcsec
Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 8