Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200605/MFreyberg_slewcal.pdf Дата изменения: Wed May 14 13:10:25 2014 Дата индексирования: Wed Apr 13 13:34:50 2016 Кодировка: Поисковые слова: universe

Calibration asp ects in the XMM-Newton Slew Survey
Michael Freyb erg, MPE

· Optical Loading · Pattern Pileup / Pseudo-MIPs · Internal FIFO overflows · Straylight / PSF · Background

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

1


XMM-Newton Slew Survey: EPIC-pn

· EPIC-pn in same sub-mo de as previous science exp osure, with Medium filter (may not always b e optimal) · EPIC-MOS to o slow (90 arcsec/s, 2.6 s/FT), in CalClosed since Rev.918 · eFF, FF, LW mo des (199.2, 73.4, 47.7 ms): 12 CCDs · SW, TI, BU mo des (1 CCD): prop osal to use Closed (instead of Medium) filter

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

2


Optical Loading
· no correlation of XMMSL1 rate with optical brightness found · however, such a correlation is exp ected (XMM-SOC-CAL-TN-0051)

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

3


Optical Loading: pattern pileup

· valid pattern typ es: S, D, T, Q (PATTERN .le. 12) · however, bright stars may have pattern size .gt. 300 ! · movie: Sirius (XIAT-34, Rev.1065) · mV = -1.47, EPIC-pn: 5000 cts/s in FF mo de, Medium filter · even bright optical loading sources do NOT show out-of-time events

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

4


Sirius entering FOV (CCD6)

after 1 full frame: 3 ­ 4 completely empty frames

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

5


Optical Loading: Out-of-Time Events

· even bright optical loading sources do NOT show out-of-time events · Sirius ("most on-axis") central pixel: 1700 adu · total p er frame (68 ms): 42000 adu · 1 adu p er cycle time: 5/3.65 optical photons · lower threshold of 20 adu means: 27.4 photons/pixel · time b elow PSF: 68 ms, OoT: 4.8 ms / 200 pixel · "effective threshold": source with central pixel 58000 adu · even Sirius factor of 30 to o weak (and: MIP threshold 3000 adu)

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

6


Internal FIFO overflows: FFFF entries

· bright (optical) source: 300 cts/frame · followed by numb er of frames without any events · also following FFFF entries in PNAUX1 FTCOARSE column · Burwitz et al: TI mo de, = 76 ms · FF mo de (73 ms) ? Faint source ? Statistics ! · see also: F.Hab erl RXJ1856 · SAS do es not yet detect short gaps on FT level; however, interface for FIFO overflow effects already present in SAS task epframes, needs to b e calibrated · movie: Sirius (XIAT-34, Rev.1065)

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

7


Sirius passing through FOV: I

after 1 frame: 3 ­ 4 completely empty frames

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

8


Sirius passing through FOV: I I

after 1 full frame: 3 ­ 4 completely empty frames

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

9


Sirius passing through FOV: I I I

after 1 full frame: 3 ­ 4 completely empty frames

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

10


Sirius passing through FOV: IV

after 1 full frame: 3 ­ 4 completely empty frames

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

11


Straylight + off-axis PSF

· optical/X-ray source: single reflections (hyp erb ola) ? See EPIC Background Working Group Meeting presentation (mjf@20060502) · average slew survey PSF: off-axis (impact) parameter · movie

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

12


Star outside FOV (CCD5)

9080300003

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

13


Star inside FOV (CCD5)

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

14


Bright X-ray source: pseudo-MIPs

· bright (hard) source: 30 cts/frame · pile-up in 1 pixel in 1 frame ab ove 3000 adu (15 keV) · triggers MIP rejection scheme · central columns of PSF rejected · movie

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

15


Bright X-ray source

9088000004

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

16


Bright X-ray source

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

17


Bright X-ray source

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

18


Particle Background
· use Closed + CalClosed exp osures: 10 ­ 12 keV rate vs. time · b e careful of selection/scheduling bias! · slews in Revs. 918 ­ 952 CalClosed (first + last slew IDLE)

Michael Freyb erg MPE Garching

XMM-Newton EPIC Calibration Meeting, MPE Garching, 04 May 2006

19