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VLT-ISAAC 3-5 mu m spectroscopy as a new tool for investigating H2 emission in protostellar jets
We report 3-5 mu m IR spectroscopy obtained with VLT-ISAAC on the IRS17molecular hydrogen jet in the Vela-D Molecular Cloud. Together withH2 emission lines from the v = 1 rovibrational state, thespectra show several pure rotational lines of the fundamental state withexcitation temperature up to ~ 22 000 K. We show how theoreticalrotation diagrams indicate these lines as unique both to probe thepresence of collisionally excited gas in NLTE conditions and to inferthe gas density.
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Observation and Astrometry data
| Constellation: | Λυγξ |
| Right ascension: | 06h17m59.66s |
| Declination: | +56°37'31.6" |
| Apparent magnitude: | 8.578 |
| Distance: | 452.489 parsecs |
| Proper motion RA: | -1.2 |
| Proper motion Dec: | -15.1 |
| B-T magnitude: | 10.206 |
| V-T magnitude: | 8.713 |
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