Suzaku XIS cal status XIS system Spaced-row Charge Injection (SCI) Contamination Hironori Matsumoto (Kyoto Univ.) Eric Miller (MIT)

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Presentation transcript:

Suzaku XIS cal status XIS system Spaced-row Charge Injection (SCI) Contamination Hironori Matsumoto (Kyoto Univ.) Eric Miller (MIT)

XIS system=X-ray CCD 4CCD cameras (XIS0, 1, 2, 3) XIS0 & XIS3 … Front-Illuminated CCD (FI) XIS1 … Back-illuminated CCD (BI) XIS2 … No operation (malfunction on Nov. 9, 2006) Picture of one CCD camera

CTI is increasing Measured with the calibration sources (55Fe) Mn Ka peak Mn Ka FWHM Start SCI FIs BI FIs BI Without detailed SCI-CTI correction

Spaced-row Charge Injection (SCI)

Black No SCI Lauch+56days FWHM=144eV Red No SCI Launch+490days FWHM=206eV Black No SCI Lauch+56days FWHM=144eV Green with SCI Launch+490days FWHM=140eV Black: No SCI (Launch+56days)  Red: No SCI (Launchi+490days)  Green:SCI (Launch+490days) with/without SCI (55Fe)

CTI with SCI: Saw-tooth structure Transfer Number Pulse Height Charge-injected rows Ground experiment with a proton-damaged CCD (Tomida et al. 1997, PASJ) Transfer Number Pulse Height Our model Measure the “envelope” lines (red and blue lines) with data Connect the lines to determine the CTI (green line)

Measure the sow-tooth structure Number of Transfer Obtained the envelope lines (red and blue) by the calibration sources and the Fe Ka line from the Perseus cluster. Then we obtained the saw-tooth structure (green line) by connecting the lines. 55FePerseus Fe Ka

After the saw-tooth CTI correction (1) 2006/92007/22008/1 XIS0(FI)XIS1(BI) Systematic error of the gain is less than ~15eV at 5.9 keV. In the low energy band, the error is less than ~10eV confirmed with the E0102 and Cygnus Loop observations. Center energy of the Mn Ka line Time after launch (sec)

After the saw-tooth CTI correction (2) Deviation of the Mn Ka line width (1sigma) from values predicted by response files. XIS0(FI) XIS1(BI) Additional width(1 sigma) (keV) Systematic error on the line width is less than 20 eV at 5.9 keV.

Contamination on the Suzaku/XIS soft response (< 1 keV) degraded after launch molecular contaminant on OBFs varies with time, position on detector, detector composition uncertain –assume DEHP (plasticizer) from IRU; C 24 H 38 O 4 –BUT C/O > 6 appears likely; also C-band degradation appears to have ~ stabilized monitoring –on-axis: E0102 (monthly), RXJ1856 (2x/yr), PKS2155 –full-field: bright Earth (monthly), Cygnus Loop, clusters

Contamination: On-Axis 25% 70% 36%

Contamination: On-Axis

Contamination: Spatial Non-Uniformity measured by line ratio of OK (525 eV) and NK (392 eV) in bright Earth data radial gradient –more contaminant in center –OBF temperature gradient –decreasing with time; building up in outer parts? A  (full-field) not as degraded as A eff (on-axis) –50% vs keV

XIS Contamination: Summary on-axis appears to have ~ stabilized off-axis contamination lower, may be catching up monitoring continues open questions –composition: C/O > 6? something else? –A eff at energies < 0.3 keV ? decrease unexplained by current contamination model –why detector-detector differences? –temporal variation (“wiggles”); thermal? background?