About LOMASS: Over the past decade, the molecular astrophysics group at Leiden Observatory has obtained a comprehensive dataset of various molecular lines toward a large number of Class 0 and Class I young stellar objects (YSOs) through various research projects. In addition, data from other projects on the same targets has been downloaded from the raw data archive. This website is a public web archive of the reduced data from the James Clerk Maxwell Telescope (JCMT) and Atacama Pathfinder EXperiment (APEX, especially the CHAMP+ instrument). Both single pointings and small maps are presented. The spectral data provide information on the chemical and physical properties of low-mass YSOs and provide a reference for higher resolution interferometry data, especially ALMA.
If this database was used for your research, please cite the original paper Carney, M.T., Yildiz, U.A., Mottram, J.C., van Dishoeck, E.F., Ramchandani, J., & Jorgensen, J.K. 2016, Astronomy & Astrophysics, 586, A44 and/or include the following acknowledgment (or variation thereof) in your published material: This publication uses the Leiden Observatory Single-dish Sub-mm Spectral Database of Low-mass YSOs (LOMASS) hosted by the astrochemistry group of Leiden Observatory, The Netherlands.
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Limitations and Further DevelopmentsThe dataset is currently limited to Class 0 and Class I low-mass YSOs from James Clerk Maxwell Telescope (JCMT) and Atacama Pathfinder EXperiment (APEX).
Please email Umut.Yildiz@jpl.nasa.gov for questions, remarks or updates to the database.