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AEOS Telescope + Image-Slicer/ Spectrograph PowerPoint Presentation
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AEOS Telescope + Image-Slicer/ Spectrograph

AEOS Telescope + Image-Slicer/ Spectrograph

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AEOS Telescope + Image-Slicer/ Spectrograph

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  1. AEOS Telescope +Image-Slicer/ Spectrograph Data Reduction and Results for June 8, 2006

  2. AEOS + Image-Slicer Spectrograph: Observing parameters • 3.7-meter telescope with adaptive optics • Scale: 0.5 arc-seconds per fiber • 1-minute exposures • Twilight not significant • Calibrated with standard stars • June 8: 10 data cubes • June 9: 8 data cubes

  3. AEOS + Image-Slicer Spectrograph: Raw Data Mercury Flat Field Sodium Lamp

  4. AEOS + Image-Slicer Spectrograph: Remove Spectral Curvature Mercury Flat Field

  5. AEOS + Image-Slicer Spectrograph: Locate Each Fiber at Each Wavelength

  6. AEOS + Image-Slicer Spectrograph: Image Reconstruction Method • Choose wavelength (row) • Fiber brightness = sum of 5 pixels • Don’t spatially align the spectral images • Would increase fiber-to-fiber contamination • Fiber spacing varies over the image

  7. AEOS Reconstructed Images Mercury reconstructed Final Image (continuum) Each raw image yields a data cube of 1024 images Flat field reconstructed

  8. AEOS + Image-Slicer Spectrograph: Subtraction of surface-reflected solar spec. • Ganymede spectrum = solar spectrum without Na emission • (Ganymede spectrum) x (Merc. Image) = artificial data cube of Mercury w/o Na • Subtract artificial data cube from real data cube to yield Na emission

  9. Mercury at D1+D2 Merc. x Gany. at D1+D2 - = Na Exosphere

  10. Surface (Continuum) Sodium Exosphere (D1+D2) |---- 3’’ ----| June 8, 2006 • Absolute brightness uncertainty: ~20%