BASECOL and VAMDC: A new way to access and manipulate molecular collisional data for interstellar applications

Statistics – Applications

Scientific paper

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Scientific paper

Understanding the language of Interstellar Molecules requires to combine observations and modelling of interstellar media. Many software applications have been or are being developed in order to analyse spectra (CASSIS project, CATS project, STARFORMAT). These applications rely heavily on the knowledge of molecular spectroscopy data such as those found in the CDMS and JPL databases, and collisional excitation rate coefficients such as those found in BASECOL. The usual difficulty met by astrophysical users is to combine data from these different databases. Combination of data implies the possibility to match molecular states that are very often described differently in JPL, CDMS and BASECOL. In order to overcome this problem BASECOL has imported spectroscopic data from JPL/CDMS, for each molecule scientific work was done locally in order to transform CDMS/JPL molecular description into BASECOL internal description, and then a complete and coherent set of data including spectroscopic and collisional data were prepared for the users. This required lengthy manipulation of data for each individual molecule, that should not be necessary any more within the VAMDC infrastructure. VAMDC infrastructure implies an output of databases into an unified format (XSAMS-VAMDC format) for description of data, the possibility of finding resources through registries using unified query language and finally integrating different sets of data from different databases. The specific case of integrating BASECOL and CDMS/JPL within the context of astrophysical applications will be presented in this paper.

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