AEOS Telescope + Image-Slicer/ Spectrograph Data Reduction and Results for June 8, 2006.
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Transcript of AEOS Telescope + Image-Slicer/ Spectrograph Data Reduction and Results for June 8, 2006.
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AEOS Telescope +Image-Slicer/ Spectrograph
Data Reduction and Results for June 8, 2006
![Page 2: AEOS Telescope + Image-Slicer/ Spectrograph Data Reduction and Results for June 8, 2006.](https://reader035.fdocuments.us/reader035/viewer/2022081515/56649d415503460f94a1c6cd/html5/thumbnails/2.jpg)
• 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
AEOS + Image-Slicer Spectrograph:Observing parameters
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Mercury
Flat Field
SodiumLamp
AEOS + Image-Slicer Spectrograph: Raw Data
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Mercury
Flat Field
AEOS + Image-Slicer Spectrograph:Remove Spectral Curvature
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AEOS + Image-Slicer Spectrograph:
Locate Each Fiber at Each Wavelength
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• 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
AEOS + Image-Slicer Spectrograph:Image Reconstruction Method
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AEOSReconstructed Images
Mercury reconstructed
Flat field reconstructed
Final Image (continuum)
Each raw image yields a data cube of 1024 images
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• 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
AEOS + Image-Slicer Spectrograph:Subtraction of surface-reflected solar spec.
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Mercury at D1+D2 Merc. x Gany. at D1+D2
Na Exosphere
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Surface (Continuum) Sodium Exosphere (D1+D2)
Absolute brightness uncertainty: ~20%
June 8, 2006|---- 3’’ ----|