Issue |
A&A
Volume 414, Number 3, February II 2004
|
|
---|---|---|
Page(s) | 969 - 978 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20031535 | |
Published online | 27 January 2004 |
Molecular cloud structure and star formation near HH 216 in M 16
1
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2
Niels Bohr Institute for Astronomy, Physics and Geophysics, 2100 Copenhagen, Denmark
3
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
4
Observatoire de l'Université de Bordeaux I, BP 89, 33270 Floirac, France
5
SEST, ESO-La Silla, Casilla 19001, Santiago 19, Chile
6
Onsala Space Observatory, 43992 Sweden
7
SOAR, Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
Corresponding author: M. Andersen, mortena@aip.de
Received:
30
October
2001
Accepted:
25
September
2003
We present millimetre, optical, and near-infrared
observations of M 16 in the vicinity of the Herbig-Haro
object HH 216.
The line profiles of the spectra are broad and
consist of both emission originating from four
warm molecular cores and a large cloud or cloud
system across the whole field. The
and the
lines are relatively broad compared with
those observed in low-mass star formation regions, but not
unusually broad for higher-mass star-forming regions. The virial
masses found are much larger than the mass estimates based on the
assumption of LTE.
The optical images suggest that HH 216 is the terminating bow shock of a large Herbig-Haro flow which includes a jet.
A possible location for the driving source is suggested, from the presence of a very reddened point source associated with what may be a small reflection nebula at the tip of a dense molecular “trunk”.
Another reflection nebula associated with the same core is also detected.
This demonstrates that star formation is taking place in the trunk.
Key words: stars: formation / ISM: H II regions / ISM: jets and outflows / ISM: molecules / ISM individual object: M 16 / ISM individual object: HH 216
© ESO, 2004
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