rdx.rst

DRP assessments

Analysis class: :class:`~mangadap.proc.reductionassessments.ReductionAssessment`

Method definition: :class:`~mangadap.proc.reductionassessments.ReductionAssessmentDef`

Reference root: $MANGA_SPECTRO_ANALYSIS/$MANGADRP_VER/$MANGADAP_VER/common

Reference file: manga-[PLATE]-[IFUDESIGN]-[DRPQA_KEY].fits.gz

Config files: $MANGADAP_DIR/mangadap/config/reduction_assessments

Example config: snrg.ini

# The response function used is that provided by Jim Gunn in June 2001,
# found here:
#
# http://www.sdss3.org/binaries/filter_curves.fits
#
# and parsed into text files.
[Path]
dapsrc                 = ${MANGADAP_DIR}

[default]
key                    = SNRG
wave_limits
response_function_file = ${Path:dapsrc}/data/filter_response/gunn_2001_g_response.db
in_vacuum              = True
covariance             = True

Important class dependencies:

• :class:`~mangadap.datacube.datacube.DataCube`: Base class that provides the datacube to be assessed.

Algorithm:

• Ignore any pixels that are either masked by the boolean mask or flagged with the flags returned by :func:`~mangadap.datacube.datacube.DataCube.do_not_use_flags`.
• Compute sky coordinates of each spaxel using :func:`~mangadap.datacube.datacube.DataCube.mean_sky_coordinates`. (SPX_SKYCOO in MAPS file)
• Use input ellipticity and position angle parameters to compute semi-major axis radii using :class:`~mangadap.util.geometry.SemiMajorAxisCoo` (SPX_ELLCOO in MAPS file)
• Determine the fraction of unmasked wavelength channels for each spaxel
• If config specifies covariance calculation, compute the covariance using the LOGRSS file at:
  • the center of the wavelength range if wavelength limits specified or,
  • the broad-band weighted center of the response function
• Compute the (band-weighted) mean signal in each spaxel (SPX_MFLUX in MAPS file), (band-weighted) mean variance in each spaxel (SPX_MFLUX_IVAR in MAPS file), and the (band-weighted) mean S/N in each spaxel (SPX_SNR in MAPS file), using :func:`~mangadap.datacube.datacube.DataCube.flux_stats`.