VLT-ISAAC spectroscopy of H2 pure rotational lines: a new tool for investigating protostellar jets

Dario Lorenzetti; Teresa Giannini; Brunella Nisini; Fabrizio Vitali; Alessio Caratti o Garatti

doi:10.1117/12.456512

13 February 2003 VLT-ISAAC spectroscopy of H₂ pure rotational lines: a new tool for investigating protostellar jets

Dario Lorenzetti, Teresa Giannini, Brunella Nisini, Fabrizio Vitali, Alessio Caratti o Garatti

Proceedings Volume 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II; (2003) https://doi.org/10.1117/12.456512
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Dario Lorenzetti, Teresa Giannini, Brunella Nisini, Fabrizio Vitali, and 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); https://doi.org/10.1117/12.456512

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