This page describes deep stacks produced at TERAPIX in the COSMOS/ACS F10 field.

Outline of the data processing steps

These images were reduced using the TERAPIX pipeline tools, following standard techniques, which are as follows:

 Pre-reduced data from CFHT is ingested into the TERAPIX pipeline and used to produce weight-maps for each image

 We compute a global astrometric and photometric solution for all images (for the i* data there are around 90 images in total)

 Using this solution, the data is median combined using SWARP to produce a single, contiguous image, as well as its associated weight map.

 Sextractor is used to produce the final image catalogue from the full contiguous image and its associated weight map

 A rebinned image (at 0.35''/pixel) is produced for image visualisation purposes

 Masks are produced which define the usable area of field

 Star/galaxy separation is carried out using a locally-computed flux-radius to define the stellar locus

 a second sub-catalogue is produced which contains a subset of parameters extracted from the full catalogue but contains also star/galaxy separation information and mask information.