Data Reduction Recipies for Michelle
ORAC Data Reduction Recipes for Michelle
We cover all of the most common observing modes when using Michelle. If you
plan to use Michelle in a way that isn't described below and would like a
data reduction recipe avaliable for you observing run, or if you don't see
a recipe that fulfills your requirements, please contact your support
scientist well in advance of your run.
Observing Modes:
Calibration data:
Observational data:
Imaging:
Spectroscopy:
Imaging polarimetry:
Spectropolarimetry:
Engineering and miscellaneous data:
Notes
Calibration data:
1) Array Tests
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ORACDR Recipe
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Requirements
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Description
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ARRAY_TESTS
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None
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Reduce array test data and produce statistics
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QUICK_LOOK
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None
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Very basic reduction, no row extraction
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2) Flats and Arcs
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ORACDR Recipe
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Requirements
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Description
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REDUCE_DARK
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Dark
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Reduces a dark frame
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REDUCE_FLAT
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Flat
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Reduces and normalises a flatfield
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REDUCE_ARC
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Flat & Arc
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Reduces an arc and produces a 1-d spectrum
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QUICK_LOOK
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None
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Very basic reduction, no row extraction
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Observational data:
Imaging:
1) Point source imaging.
The following recipes are used for imaging point or slightly extended sources.
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ORACDR Recipe
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Requirements
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Description
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NOD_CHOP
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None
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Reduction of ABBA point source imaging
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NOD_CHOP_APHOT
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None
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As above, but with photometry
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NOD_CHOP_FAINT
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None
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As above, but for a faint source at
the same position on the array as the standard
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MOVING_NOD_CHOP
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None
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As Nod_CHOP, but for non-sidereal targets
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QUICK_LOOK
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None
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Basic reduction, no coadding
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2) Extended source imaging
Use the following recipe for scanned imaging of an extended region.
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ORACDR Recipe
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Requirements
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Description
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NOD_CHOP_SCAN
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None
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Reduction of ABBA imaging at various scan positions
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Spectroscopy:
1) Standard star, nodding (and chopping) along the
slit.
The following recipes will all work given that the requirements are met (e.g.,
a flat must have been taken at the correct settings for STANDARD_STAR to
work) for a bright point source and for nodding along the slit.
2) Target, nodding (and chopping) along slit.
These recipes will work for targets that are observed by nodding along the
slit. Some require a standard star to have already been observed.
3) Extended source, nodding to blank sky.
The following will work for extended sources that require you to nod to blank
sky. They will also work for point sources in crowded fields that also require
a nod to blank sky.
Imaging polarimetry
1) Point source imaging polarimetry
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ORACDR Recipe
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Requirements
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Description
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POL_NOD_CHOP
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None
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Basic reduction of imaging polarimetry data, nod before waveplate
is moved
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POL_ANGLE_NOD_CHOP
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None
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Basic reduction of imaging polarimetry
data, move waveplate before nodding
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QUICK_LOOK
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None
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Very basic reduction.
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Spectropolarimetry
1) Point source and spectropolarimetry
The following will also work for slightly extended targets as well as point
sources.
Engineering and miscellaneous data:
1) End of Night/Emissivity
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ORACDR Recipe
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Requirements
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Description
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EMISSIVITY
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Flat
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Reduces emissivity data, logs results
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QUICK_LOOK
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None
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Very basic reduction
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2) Other/miscellaneous
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ORACDR Recipe
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Requirements
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Description
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CHOPCONV
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None
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Writes out chopped data to individual files
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NIGHT_LOG
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Some data
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Creates an observing log
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FITSCONV
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None
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Converts chopped data to fits format
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