Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...542l.135f&link_type=abstract
The Astrophysical Journal, Volume 542, Issue 2, pp. L135-L138.
Astronomy and Astrophysics
Astronomy
49
Ism: Jets And Outflows, Masers, Stars: Evolution, Stars: Individual: Alphanumeric: S106 Fir, Stars: Pre-Main-Sequence, Techniques: Interferometric
Scientific paper
We report the discovery, through Very Long Baseline Array (VLBA) observations of H2O masers at 22 GHz, of a newly ejected extraordinarily compact protostellar jet-a microjet-from the class 0 protostar S106 FIR. The sub-AU resolution VLBA observations revealed the presence of a U-shaped distribution of the masers in the western blueshifted cluster. It has a length of 4 AU, has a width of 3 AU, and is located at a distance of 25 AU from the assumed position of the star around the middle point of the two maser clusters. The U-shaped distribution is considered to be a ``microbowshock'' created by the impact of the microjet on the ambient cloud medium. We succeeded in tracking the proper motion of the microbowshock; its velocity ranges from 25 to 45 km s-1, estimated from the proper motions and line-of-sight velocities. In addition, this source stands unique among all 40 known class 0 sources in its lack of an extensive molecular outflow, evidenced by our sensitive multitransition CO searches with 10 σ upper limits of ~10-6 Msolar km-1 s. We propose that S106 FIR is an archetype of the youngest evolutionary class, a protostar observed just after the creation of the protostellar jet.
Alwyn Wootten H.
Claussen Mark J.
Furuya Ray S.
Kawabe Ryohei
Kitamura Yoshimi
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