Issue |
A&A
Volume 419, Number 1, May III 2004
|
|
---|---|---|
Page(s) | 241 - 247 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20035931 | |
Published online | 23 April 2004 |
Research Note
Discovery of [FeII]- and H
-emission from protostellar jets in the
CB3 and CB230 globules
1
Osservatorio Astrofisico di Arcetri, INAF, Largo E. Fermi 5, 50125 Firenze, Italy
2
Istituto di Radioastronomia, CNR, Sezione di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
3
Istituto di Radioastronomia, CNR, via P. Gobetti 101, 40129 Bologna, Italy
Corresponding author: F. Massi, fmassi@arcetri.astro.it
Received:
22
December
2003
Accepted:
2
March
2004
Four Bok globules were studied in the Near-Infrared, through narrow-band
filters, centered at the 1.644 μm line of [FeII], the H2-line
at 2.122 μm, and the adjacent continuum.
We report the discovery of [Feii] and H2 protostellar jets and knots
in the globules CB3 and CB230. The [FeII]-jet in CB230 is defined by a
continuous elongated emission feature, superimposed on which two knots are
seen; the brighter one lies at the tip of the jet. The jet is oriented in the
same direction as the large-scale CO outflow, and emerges from the nebulosity
in which a Young Stellar Object is embedded. The H2 emission
associated with this jet is fainter and wider than the [FeII] emission, and
is likely coming from the walls of the jet-channel.
In CB3 four H2 emission knots are found, all towards the blue-shifted lobe
of the large-scale outflow.
There is a good correspondence between the
location of the knots and the
blue-shifted SiO(5-4) emission,
confirming that SiO emission is tracing the jet-like flow rather well.
No line emission is found in the other two targets, CB188 and CB205, although
in CB205 faint line emission may have been hidden in the diffuse nebulosity
near the IRAS position. Around this position a small group of (≥)
stars is found, embedded in the nebula. A diffuse jet-like feature near this
group, previously reported in the literature, has been resolved into
individual stars.
Key words: stars: formation / ISM: jets and outflows / infrared: ISM
© ESO, 2004
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