Artículo de revista
Evidence for evolution of the outflow collimation in very young stellar objects
Fecha
2003-12-01Registro en:
The Astrophysical Journal, 598:L115–L119, 2003 December 1
Autor
Torrelles, J. M.
Patel, N. A.
Anglada Escudé, Guillem
Gómez, J. F.
Ho, P. T. P.
Lara, L.
Alberdi, A.
Cantó, J.
Curiel, S.
Garay Brignardello, Guido
Rodríguez, L. F.
Institución
Resumen
We present Very Long Baseline Array proper-motion measurements of water masers toward two young stellar
objects (YSOs) of the W75 N star-forming region. We find that these two objects are remarkable for having a
similar spectral type, being separated by 0 .7 (corresponding to 1400 AU), and sharing the same environment, but
with a strikingly different outflow ejection geometry. One source has a collimated, jetlike outflow at a 2000 AU
scale, while the other has a shell outflow at a 160 AU scale expanding in multiple directions with respect to a
central compact radio continuum source. This result reveals that outflow collimation is not only a consequence of
ambient conditions but is something intrinsic to the individual evolution of stars and brings to light the possibility
of noncollimated outflows in the earliest stages of YSOs.