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

Abstract

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.