Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...598l.115t&link_type=abstract
The Astrophysical Journal, Volume 598, Issue 2, pp. L115-L119.
Astronomy and Astrophysics
Astronomy
53
Ism: Individual: Alphanumeric: W75, Ism: Jets And Outflows, Masers, Stars: Formation
Scientific paper
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.
Alberdi Antonio
Anglada Guillem
Cantó Jorge
Curiel Salvador
Garay Guido
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