some chandra basics. chandra x-ray observatory

8
Some Chandra Basics

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Page 1: Some Chandra Basics. Chandra X-Ray Observatory

Some Chandra Basics

Page 2: Some Chandra Basics. Chandra X-Ray Observatory
Page 3: Some Chandra Basics. Chandra X-Ray Observatory

Chandra X-Ray Observatory

Page 4: 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

Page 5: Some Chandra Basics. Chandra X-Ray Observatory
Page 6: Some Chandra Basics. Chandra X-Ray Observatory
Page 7: Some Chandra Basics. Chandra X-Ray Observatory

• 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 Forbidden 1.840 keV Intercombination 1.855 keV Resonance 1.865 keV

Si Ly (H-like ion) 2.006 keV

blended

Page 8: Some Chandra Basics. Chandra X-Ray Observatory

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)