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Understanding WFC3 and ACS Associations for Data Products and their Structure

This document provides a comprehensive overview of the WFC3 (Wide Field Camera 3) and ACS (Advanced Camera for Surveys) associations, detailing the structure of product datasets. It explains the association tables, product types such as dither and sub-products, their naming conventions, and handling missing exposures. Special attention is given to the creation of dummy dither products and the future possibilities of mosaics. This guide aims to clarify data organization for effective utilization in astronomical research within the WFC3 PDR framework.

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Understanding WFC3 and ACS Associations for Data Products and their Structure

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  1. WFC3 and Association Structure Ed Hopkins WFC3 PDR

  2. WFC3 and ACS associations • They are the same! • Unless we are explicitly told otherwise • These are 100% reused slides! WFC3 PDR

  3. WFC3 Associations: general considerations • There will be an association table and multiple exposure and product datasets • Each product or sub product and each exposure is in a separate dataset • There can be from 1 to 19 products (0-9 and A-I) • The product ending in “0” is always the dither product • There can only be 18 “pointings” in a ditther • There will be two kinds of products: sub products and main or dither products • Sub-products are made from sets of repeat-obs or cr-split exposures • In these cases the subproduct will always end in “1” • There will be no dataset with the same name as the association • Dither products are made from sub-products or exposures WFC3 PDR

  4. WFC3 Associations: one level WFC3 PDR

  5. WFC3 Associations: two levels WFC3 PDR

  6. WFC3 Associations: two levels: comments • This could be a picture of several cr-splits and a dither/main product • This could be a picture of several repeat obs and a dither/main product WFC3 PDR

  7. WFC3 Associations: when exposures are missing • WFC3 will always produce a sub product or dither product if it has anything to work with • If it has at least one exposure for that product or sub product it will produce a product WFC3 PDR

  8. Dither products • If WFC3 is not ready to produce real dither products, it will produce dummy dither products. • These dummys are the entries that go in the science table • They representing the exposures the dither product would have been built from WFC3 PDR

  9. Mosaics • Mosaics are not associated • These could be produced in the future by the OTFR system • If the correct groupings were “manually” put in the archive database tables WFC3 PDR

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