REDUCE_SCIENCE_FSW

Reduce an ACSIS narrow-line science observation using advanced algorithms

Description:

This recipe is used for advanced narrow-line ACSIS data processing.

This recipe first creates a spatial cube from the raw time series data. Then, working on the raw time series data, it subtracts a median time-series signal, thresholds the data, then trims the ends of the frequency range to remove high-noise regions.

After the time-series manipulation has been done to every member of the current group, every member is run through MAKECUBE to create a group spatial cube. This cube then has its baseline removed through a smoothing process, and moments maps are created.

A baseline mask formed from the group cube is run through UNMAKECUBE to form baseline masks for the input time-series data, which are then baselined. The baselined time-series data are then run through MAKECUBE to create observation cubes, from which moments maps are created.

Notes:

Available Parameters :

The following parameters can be set via the -recpars option:
BASELINE_ORDER
The polynomial order to use when baselining cubes.
CREATE_MOMENTS_USING_SNR
If set to true (1), moments maps will be created using a signal-to-noise map to find emission regions. This could be useful when observations were taken under differing sky conditions and thus have different noise levels.
CUBE_WCS
The coordinate system to regrid the cubes to.
FLATFIELD
Whether or not to perform flat-fielding.
MOMENTS
A comma-separated list of moments maps to create.
MOMENTS_LOWER_VELOCITY
Set a lower velocity over which the moments maps are to be created. Typically used in conjunction with MOMENTS_UPPER_VELOCITY. Must include at least one decimal place (i.e. " -50.0" for setting the limit to -50 km/s).
MOMENTS_UPPER_VELOCITY
Set an upper velocity over which the moments maps are to be created. Typically used in conjunction with MOMENTS_LOWER_VELOCITY. Must include at least one decimal place (i.e. " 50.0" for setting the limit to 50 km/s).
PIXEL_SCALE
Pixel scale, in arcseconds, of cubes.
REBIN
A comma-separated list of velocity resolutions to rebin the final cube to.
RESTRICT_LOWER_VELOCITY
Trim all data to this lower velocity. Must include at least one decimal place (i.e. " -50.0" for restricting to -50 km/s).
RESTRICT_UPPER_VELOCITY
Trim all data to this upper velocity. Must include at least one decimal place (i.e. " 100.0" for restricting to 100 km/s).
SPREAD_METHOD
The method to use when spreading each input pixel value out between a group of neighbouring output pixels when regridding cubes. See the SPREAD parameter in SMURF/MAKECUBE for available spreading methods.
SPREAD_WIDTH
The number of arcseconds on either side of the output position which are to receive contributions from the input pixel. See the PARAMS parameter in SMURF/MAKECUBE for more information.
SPREAD_FWHM_OR_ZERO
Depending on the spreading method, this parameter controls the number of arcseconds at which the envelope of the spreading function goes to zero, or the full-width at half-maximum for the Gaussian envelope. See the PARAMS parameter in SMURF/MAKECUBE for more information.

Output Data

Related Recipes

REDUCE_SCIENCE_GRADIENT.