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D5.3v2: Calculation of Luminosity Profiles for a Sample of Galaxies extracted from Catalogues using Isolation Criteria
- This document describes the development of the second Golden Exemplar proposed in Work Package 5: Workflow Astronomy Preservation, and provides discussion about user-driven issues risen in this process and related with general objectives of the Wf4Ever project. The document pertains to the assembly of two Research Objects (RO) packing the digital experiment undertaken for the extraction of a sample of galaxies based on environmental criteria and the calculation of luminosity profiles in several bands for each of the galaxies. The main purpose of deliverable D5.3v2 is to produce the workflows and ROs for the second Golden Exemplar in order to provide feedback based on a user experience for the models and technologies developed in the Wf4Ever project. The workflows and ROs developed may be accessed publicly in the MyExperiment1 portal, where the two ROs produced have been uploaded as MyExperiment Packs, as well as in the RODL Wf4Ever Sandbox2   . The scientific experiment represented is related with the extraction of a sample of galaxies from a database provided by public archives as well as its photometric study in several observed bands. Two different approaches have been considered in the development of these workflows and ROs: the migration of already existing Python scripts into Taverna workflows for the characterization of the target sample constitutes the strategy followed in the development of the first RO, while in the second one we decided to start from scratch the conception and development of the workflows related to the photometric study. The fact of considering a large sample of galaxies and the complexity of the whole protocol to follow makes this use case suitable for a methodology benefiting from a workflow automated and reproducible approach. Furthermore, the work implies collaboration between different experts, and when the results published, will allow other researchers to perform the study using the same methodology with another sample, so that a comparison with galaxies in other environments (pairs, groups) is valid. We provide a detailed description of the Golden Exemplar including information about the implementation process of the ROs and the scientific results obtained after the enactment of the workflows. We also propose a generic tree-folder structure to register and expose the many different relationships among the components of a RO in the file system, as well as their role and nature, since we still do not have the tools to visualize them as semantic web annotations provided in the RO building process. Finally, we provide a discussion about how the use of these ROs and a set of best practices is already having an impact on the present working methodology undertaken in the team, taking also into account preservation and versioning issues as well as quality and completeness checking of the experiment.