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Some Chandra Basics

Some Chandra Basics. Chandra X-Ray Observatory. 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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Some Chandra Basics

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  1. Some Chandra Basics

  2. Chandra X-Ray Observatory

  3. 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

  4. 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 eVFWHM 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

  5. 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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