NRAO eNews
October 2008 • Vol. 1, Iss. 5

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NRAO Newsletter   •   April 2008   •   Issue 115

The ALMA Spectral Line Catalog

The “beta” release of the Database for Astronomical Spectroscopy: Splatalogue occurred on February 1 and is available at The release was made available to the entire astronomical community but with an emphasis on those researchers familiar with the public catalogs available for molecular spectroscopy including the Cologne and JPL Databases, and the Lovas list of detected astronomical transitions. The main purposes of the release were to:

  1. illustrate the power of the search capabilities of the database over all available line catalogs;
  2. introduce a new catalog to the community, the Spectral Line Atlas of Interstellar Molecules (SLAIM) which will only be available through Splatalogue;
  3. provide the community with a complete list of frequencies of H, He and C recombination lines;
  4. add newly detected transitions to the Lovas list of detected astronomical transitions and
  5. provide a limited sample of species (~200 out of 650) where the quantum numbers between all 4 catalogs were resolved, provide the line strength and energy levels in all useful astronomical units, and provide the community with an NRAO recommended rest frequency for a molecular transition.

Feedback on these goals have been sent to the ALMA Working Group on Spectral Line Frequencies and updates and corrections are ongoing. Splatalogue was also presented at the 211th AAS meeting in Austin, TX.

We anticipate a “Beta 2” release in June 2008 which will continue the work already started on the resolution and reconciliation of quantum numbers and species between all four catalogs. In the “Beta 2” release, all species will have consistent quantum numbers and the line strengths and energy levels will be available in all useful astronomical units for each transition. In addition, the default search criteria for Splatalogue will be only on NRAO recommended rest frequencies. There will also be additional search criteria and filters available, flexibility in exporting the data from a selected search, template spectra of selected astronomical environments including hot molecular cores and protoplanetary nebulae from cm to mm wavelengths, and a limited functionality to generate synthetic spectra based on the physical conditions of the astronomical environment and the type of telescope used to make the observation, including but not limited to ALMA and the EVLA. Future plans include presenting Splatalogue at the 63rd OSU meeting on Molecular Spectroscopy in June 2008 and the creation of where researchers can save and recall their most used and searched on criteria. Any questions on the form, functionality and use of Splatalogue, please contact Anthony Remijan or Andrew Markwick-Kemper.

Anthony Remijan

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