suzaku xis cal status n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Suzaku XIS cal status PowerPoint Presentation
Download Presentation
Suzaku XIS cal status

Loading in 2 Seconds...

play fullscreen
1 / 14

Suzaku XIS cal status - PowerPoint PPT Presentation


  • 122 Views
  • Uploaded on

Suzaku XIS cal status. XIS system Spaced-row Charge Injection (SCI) Contamination. Hironori Matsumoto (Kyoto Univ.) Eric Miller (MIT). XIS system=X-ray CCD. Picture of one CCD camera. 4CCD cameras (XIS0, 1, 2, 3) XIS0 & XIS3 … Front-Illuminated CCD (FI) XIS1 … Back-illuminated CCD (BI)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Suzaku XIS cal status' - robin-hooper


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
suzaku xis cal status
Suzaku XIS cal status
  • XIS system
  • Spaced-row Charge Injection (SCI)
  • Contamination

Hironori Matsumoto (Kyoto Univ.)

Eric Miller (MIT)

xis system x ray ccd
XIS system=X-ray CCD

Picture of one CCD camera

  • 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)
cti is increasing
CTI is increasing

Measured with the calibration sources (55Fe)

Mn Ka peak

FIs

BI

Mn Ka FWHM

BI

FIs

Without detailed SCI-CTI correction

Start SCI

with without sci 55fe
with/without SCI (55Fe)

Black: No SCI (Launch+56days)Red: No SCI (Launchi+490days)Green:SCI (Launch+490days)

  • Black
    • No SCI
    • Lauch+56days
    • FWHM=144eV
  • Green
    • with SCI
    • Launch+490days
    • FWHM=140eV
  • Black
    • No SCI
    • Lauch+56days
    • FWHM=144eV
  • Red
    • No SCI
    • Launch+490days
    • FWHM=206eV
cti with sci saw tooth structure

Charge-injected rows

Pulse Height

Pulse Height

Transfer Number

Transfer Number

CTI with SCI: Saw-tooth structure

Our model

Ground experiment with a proton-damaged CCD (Tomida et al. 1997, PASJ)

  • 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

Number of Transfer

Measure the sow-tooth structure
  • 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.

55Fe

Perseus Fe Ka

after the saw tooth cti correction 1
After the saw-tooth CTI correction (1)

Center energy of the Mn Ka line

XIS0(FI)

XIS1(BI)

2006/9

2007/2

2008/1

Time after launch (sec)

Time after launch (sec)

  • 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.
after the saw tooth cti correction 2
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)

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
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; C24H38O4
    • 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 spatial non uniformity
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 Aeff (on-axis)
    • 50% vs. 36% @ 0.65 keV
xis contamination summary
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?
    • Aeff at energies < 0.3 keV ? decrease unexplained by current contamination model
    • why detector-detector differences?
    • temporal variation (“wiggles”); thermal? background?