Reduction and Calibration of MODS Data
Transcript of Reduction and Calibration of MODS Data
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The MODS Pipeline
Kevin Croxall - OSU
Reduction and Calibration of MODS Data
LBT Users Meeting - March 23, 2014
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MODS Data ReductionGoals and Vision
• High Quality Reduced Data Product
• Balance Automation Against Interaction
• Ease of Use
• Efficient & Rapid Execution
• Well Integrated Output Data
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Raw MODS
DatamodsCCDRed
MODS_REDUCESky Subtraction
Generate Sensitivity Function
Extract Spectra
MODS OTF Data
Python
IDL
MODS 2D
Spectra
MODS 1D
Spectra
MODS Reduction WorkFlow
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All Data flow through the same
Pipeline
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Prism Mode
Identify Slit Locations
MOS Mask
Long-Slit
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Wavelength Calibration Maps
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B-Spline Sky Subtraction
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B-Spline Sky SubtractionGrating Mode
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B-Spline Sky SubtractionPrism Mode
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Extracted 1D SpectraTraditional Row-Stacked Spectra Format
Sensfunc
Aperture 1
Aperture N
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We plan on having MODS Quick Look Tools release at LBT starting in the 2014B semester
Final on-site testing in April.
Longslit 1 slit ~70s / Longslit 5 slits ~380s / MOS ~40 slits ~1000s
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ManualAvailable April 15th
http://www.astronomy.ohio-state.edu/MODS/
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DistributionAvailable April 15th
The MODS pipeline will be available for Beta testing on the MODS webpage after April 15th.
It requires XIDL which can be obtained from the UCOLICK site (linked from MODS webpage).
Please report any bugs you find or other feedback.
http://www.astronomy.ohio-state.edu/MODS/http://www.ucolick.org/~xavier/IDL/
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Summary - 2D
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Summary - 1D
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Wavelength Zero-PointA.K.A. Flexure Correction
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Wavelength Zero-PointA.K.A. Flexure Correction
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Wavelength Calibration
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Wavelength Calibration
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Contours: 5577.34 + Shift
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OTF
RAW
modsCCDRedBias correctionOverscan trimFlat-fielding
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We need to have a robust trace of each slit irregardless of position on the mask.
We mapped the system using an innovative Sudoku mask.
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Sudoku
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Sudoku
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Sudoku
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Mapping .MMS Files
Sudoku Mask
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Mapping .MMS Files
Sudoku Mask
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Wavelength Calibration
Sudoku Solution
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Wavelength Calibration
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Wavelength Calibration
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Wavelength Calibration Maps
Measured Map from arc Lamps
Empirical Map derived from Sudoku transforms
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B-Spline Sky Subtraction
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B-Spline Sky Subtraction
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B-Spline Sky Subtraction
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Dispersion Correction
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B-Spline Sky Subtraction
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B-Spline Sky Subtraction
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B-Spline Sky Subtraction
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Quick Look ToolsWe plan on having MODS Quick Look Tools release at LBT starting in the 2014B semester
Final on-site testing in April.
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Future Plans
• Better Documentation
• Bug Fixes
• Overall Wrapper
• Onsite Implementation of QuickLook for 2014B
• Your Input is Welcome