Description
- Class:
jwst.ami.AmiNormalizeStep- Alias:
ami_normalize
The ami_normalize step is one of the AMI-specific steps in the ami
sub-package and is used in Stage 3 calwebb_ami3
processing. It provides normalization of LG processing results for
a science target using LG results of a reference PSF target. The algorithm
subtracts the PSF target closure phases from the science target closure
phases and divides the science target fringe amplitudes by the PSF target
fringe amplitudes.
Arguments
The ami_normalize step does not have any step-specific arguments.
Inputs
Interferometric Observables
- Data model:
- File suffix:
_ami-oi.fits and/or _psf-ami-oi.fits
The ami_normalize step takes two inputs: the first is the
interferometric observables for a science target and the second
is the interferometric observables for the PSF target. These should
be the _ami-oi.fits and _psf-ami-oi.fits products resulting from the
ami_analyze step, or two _ami-oi.fits files if the steps
are run independently. The inputs can be in the form of filenames or
AmiOIModel data models.
Outputs
Normalized Interferometric Observables
- Data model:
- File suffix:
_aminorm-oi.fits
The output is a new set of interferometric observables for the science target in which the closure phases and fringe amplitudes have been normalized using the PSF target closure phases and fringe amplitudes. The remaining components of the science target data model are left unchanged. The output file name syntax is source-based, using the product name specified in the input ASN file and having a product type of “_aminorm-oi.fits”, e.g. “jw87600-a3001_t001_niriss_f480m-nrm_aminorm-oi.fits.”
Reference Files
The ami_normalize step does not use any reference files.