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Update MRS photom documentation #9065

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Jan 10, 2025
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Update MRS photom documentation #9065

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8 changes: 4 additions & 4 deletions docs/jwst/references_general/photom_reffile.inc
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Expand Up @@ -298,15 +298,15 @@ TIMECOEFF_CH4 [1]_ BINTABLE 2 TFIELDS = 5 N/A

The SCI extension contains a 2D array of inverse sensitivity factors
corresponding to each pixel in a 2D MRS slice image. The sensitivity factors
are in units of (MJy/pixel)/(DN/sec). The ERR extension contains a 2D array of
are in units of (MJy/steradian)/(DN/sec). The ERR extension contains a 2D array of
uncertainties for the SCI values, in the same units. The DQ extension
contains a 2D array of bit-encoded data quality flags for the SCI values.
The DQ_DEF extension contains a table listing the definitions of the values
used in the DQ array. The PIXSIZ extension contains a 2D array of pixel
sizes (i.e. solid angles), in units of square-arcsec.
sizes (i.e. solid angles), in units of steradians.

The SCI and PIXSIZ array values are both divided into the science product
SCI and ERR arrays, yielding surface brightness in units of mJy/sq-arcsec.
The SCI array values are divided into the science product
SCI and ERR arrays, yielding surface brightness in units of MJy/steradian.

Scalar PHOTMJSR and PHOTUJA2 values are stored in primary header keywords
in the MIRI MRS PHOTOM reference files and are copied into the science
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