Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-14
Astronomy and Astrophysics
Astrophysics
Four DIN A4 pages, one figure. Proceedings of "Science with ALMA" conference (Madrid, November 2006)
Scientific paper
This paper presents an overview of several modeling tools for analyzing molecular line observations at submillimeter wavelengths. These tools are already proving to be very valuable for the interpretation of data from current telescopes, and will be indispensable for data obtained with ALMA. The tools are: (1) the Leiden Atomic and Molecular DAtabase (LAMDA), a collection of spectroscopic data and collisional excitation rates; (2) RADEX, an on-line and off-line program to calculate non-LTE excitation and emission from a homogeneous medium, based on the escape probability approximation; (3) RATRAN, an accelerated Monte Carlo program to solve molecular excitation and radiative transfer in spherical and cylindrical symmetry. The paper presents examples of how to use these tools in conjunction with existing data reduction packages to quantitatively interpret submillimeter single-dish and interferometric observations. The described tools are publically available at http://www.strw.leidenuniv.nl/~moldata . The paper concludes with a discussion of future needs in the fields of molecular data and radiative transfer.
Hogerheijde Michiel
van der Tak Floris
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