Interoperability and integration of theoretical data in the Virtual Observatory

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The aim of the Virtual Observatory has recently expanded from seeking interoperability among astronomical catalogue and archive systems to including also access to analysis tools, computational services and numerical simulations. As a matter of fact, beside the observational data, there is also a huge amount of theoretical data generated by computer simulations that can be useful if published in Virtual Observatory compatible form. Therefore, considerable interest has been shown in including products of theoretical research. A data model for theoretical data is being designed. At the same time, an interim Simple Numerical Access Protocol (SNAP) as part of the Data Access Layer provides, through negotiation between the client and the theoretical dataset service, a standardized access mechanism to distributed theoretical data objects. We present the first integration within the Virtual Observatory of a set of theoretical data structured with a prototype of the SNAP data access protocol. Our resource provides not only access to simulation data stored in a dedicated archive but also, interfacing web services, a visualization service and the possibility to extract a number of astronomical observables. We focussed our work on a set of numerical simulations of galaxy clusters identified at redshift 0 and produced with the GADGET2 code. We show the possibility of computing the temperature and density profiles, of visualizing theoretical results with VO-enabled astronomical tools, of comparing the results with astronomical observations. The activity is being carried out as part of VO-Tech/DS4, ITVO and VObs.it projects.

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