13 February 2003 VLT-ISAAC spectroscopy of H2 pure rotational lines: a new tool for investigating protostellar jets
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Abstract
We report 3-5 μm infrared spectroscopy obtained with VLT-ISAAC on several protostellar jets. Together with H2 emission lines from the υ=1 rotovibrational state, the spectra show several pure rotational lines of the fundamental state with excitation temperature up to ~22000 K. These observations represent the first detection from the ground of pure rotational (υ=0) H2 lines in jets. We show how theoretical rotation diagrams indicate these lines as unique both to probe the presence of collisionally excited gas in NLTE conditions and to infer the gas density.
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Dario Lorenzetti, Teresa Giannini, Brunella Nisini, Fabrizio Vitali, Alessio Caratti o Garatti, "VLT-ISAAC spectroscopy of H2 pure rotational lines: a new tool for investigating protostellar jets", Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); doi: 10.1117/12.456512; https://doi.org/10.1117/12.456512
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