| Issue |
A&A
Volume 379, Number 1, November III 2001
|
|
|---|---|---|
| Page(s) | L17 - L20 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20011345 | |
| Published online | 15 November 2001 | |
VLT-ISAAC 3-5 μm spectroscopy as a new tool for
investigating H
emission in protostellar jets
Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio, Italy e-mail: bruni, vitali, dloren@coma.mporzio.astro.it
Corresponding author: T. Giannini, teresa@coma.mporzio.astro.it
Received:
17
September
2001
Accepted:
26
September
2001
We report 3-5 μm IR spectroscopy obtained with VLT-ISAAC on the
IRS17 molecular hydrogen jet in the Vela-D Molecular Cloud. Together with H2
emission lines from the 
1 rovibrational state, the spectra show several
pure rotational lines of the fundamental state with excitation temperature up
to ~22 000 K. 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.
Key words: stars: formation / infrared: ISM / ISM: jets and outflows / ISM: individual objects: Vela clouds
© ESO, 2001
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