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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Active star formation in the large Bok globule CB 34 ?
Tigran Khanzadyan 1 , Michael D.Smith 1 , Roland Gredel 2 , Thomas Stanke 3 and Christopher J. Davis 4
1 Armagh Observatory, Armagh BT61 9DG, Northern Ireland, UK,
e-mail: tig@star.arm.ac.uk, mds@star.arm.ac.uk
2 Centro Astronomico Hispano-Aleman, E-04080 Almeria, Spain,
e-mail: gredel@caha.es
3 MPI fur Radioastronomie, Auf dem Hugel 69, D-53121, Bonn, Germany,
e-mail: tstanke@mpifr-bonn.mpg.de
4 Joint Astronomy Centre 660 N. A'Ohoku Place, University Park, Hilo, Hawaii 96720,
e-mail: c.davis@jach.hawaii.edu
Received ...; / Accepted ...
Abstract. We present near-infrared and millimetre observations of the large Bok globule CB 34. Two long parallel
trails of H2 knots are discovered on wide- eld images in the 1-0 S(1) 2.12m emission line. These parsec scale
H2 jets extend to the edge of the dark globule where they disappear without the trace of bow shocks. This
suggests that the out ows physically extend into a lower density ambient medium where their terminating bows
are beyond present detection limits. The two out ows are extremely well collimated and parallel to within 3 . The
out ow mechanical luminosity, derived from CO measurements, and the shocked luminosity, estimated from the
H2 emission, are similar, consistent with jet-driven non-evolving out ow structure. The jets appear to originate


Source: Armagh Observatory


Collections: Physics