IntroductionΒΆ
The PHZ PF is the Euclid SGS processing module responsible for receiving the photometry and morphology information from MER and producing the photometric redshift PDF to be used by LE3, the star spectral energy distributions to be used for PSF modeling by SHE and the physical parameters to be stored in the Euclid catalog. The following context diagram demonstrates the interfaces of the PHZ PF with the other Euclid processing functions.
The main input of the PHZ PF is the MER Final Catalog which contains the photometry and morphology information, as produced by MER PF. The rest of the input products coming from EAS are static models which constitute the configuration input of the PHZ PF processing elements. They are ingest in the EAS manually and their specific instances are directly referred in the IAL workflow description.
The PHZ PF produces the PHZ PF output catalog product. For each input catalog the corresponding PHZ PF output is produced. The columns of this catalog are splitted between four files in order to simplify the retrieval and the use by the L3 PF.
Photo Z catalog contains the photometric redshift, the PDZ and statistical information about the PDZ,
Physical parameters catalog contains the PDFs of all the physical parameters,
Star SED catalog contains the SEDs of the objects classified as stars,
Classification catalog contains the probability for each object to be a star a galaxy or a QSO
Furthermore the PHZ PF is also in charge of producing the Photometric redshift bias correction map product. This product contains a shift to be applied to the computed redshifts in order to correct for possible bias. The main difference in the way the Bias correction map is produced with respect to the PHZ PF Output catalog, is that it has to be computed on the full sky, accumulating Photometric redshift co-added PDZ bias map product partial results produced along each of the PHZ PF Output catalogs.
The following subsections describe the above data products in detail.