Some Chandra Basics

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Some Chandra Basics
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Chandra X-Ray Observatory
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Chandra X-ray Observatory

• Chandra has the most precise X-ray mirrors ever
  flown
• Grazing incidence paraboloid -hyperboloid mirror
  pairs give 0.5 spatial resolution

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• Transmission gratings (HETG, LETG) dispersive
  high resolution spectrometers (for compact
  sources)
• Advanced CCD Imaging Spectrometer (ACIS) CCDs
  with moderate spectral resolution
• 8 field of view
• 120 eV FWHM at 1 keV

Si He a Forbidden 1.840 keV
Intercombination 1.855 keV
Resonance 1.865 keV Si Ly a (H-like
ion) 2.006 keV
blended
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Image Event File Information

• All astronomical data now in FITS format
• Each detected event pixel ID, time, pulse height
• Differential exposure corrections can be made
• Correlation with sky can be made, so that pixel
  map in corrected image removes jitter
• For HRC, best timing and position (bad spectrum)
• For ACIS (CCD), better spectrum (120 eV FWHM)

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• Advanced CCD Imaging Spectrometer (ACIS) CCDs
  with moderate spectral resolution
• 8 field of view
• 0.5-10 keV bandpass
• 120 eV FWHM at 1 keV
• Transmission gratings (HETG, LETG)
• dispersive high resolution spectrometers
• High Resolution Camera (HRC)

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Brickhouse et al. 2000
Capella Chandra HETG Canizares et al. 2000
Mg
Si