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Proceedings Paper

VLT-ISAAC spectroscopy of H2 pure rotational lines: a new tool for investigating protostellar jets
Author(s): Dario Lorenzetti; Teresa Giannini; Brunella Nisini; Fabrizio Vitali; Alessio Caratti o Garatti
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Paper 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.

Paper Details

Date Published: 13 February 2003
PDF: 10 pages
Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); doi: 10.1117/12.456512
Show Author Affiliations
Dario Lorenzetti, Osservatorio Astronomico di Roma (Italy)
Teresa Giannini, Osservatorio Astronomico di Roma (Italy)
Brunella Nisini, Osservatorio Astronomico di Roma (Italy)
Fabrizio Vitali, Osservatorio Astronomico di Roma (Italy)
Alessio Caratti o Garatti, Osservatorio Astronomico di Roma (Italy)

Published in SPIE Proceedings Vol. 4834:
Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II
Puragra Guhathakurta, Editor(s)

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