Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101..727f&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 12, p. 727 - 740 (2008)
Astronomy and Astrophysics
Astronomy
Scientific paper
The authors present a series of studies to shed light on the earliest stage of low-mass star formation process. Their intensive survey has identified such a protostar GF 9-2 that shows the H2O maser emission, a clear signpost of protostar formation, but does not have well-developed molecular outflow. These facts indicate that the natal cloud core harboring the protostar still retains some information of the initial conditions for gravitational collapse as the core has not being dispersed by the onset of outflow. Combining single-dish radio telescope and interferometric data, they have obtained high-fidelity 3-dimensional images, yielding to analyze the density and velocity structure of the core from 0.1pc down to 0.003pc in size. Furthermore, they found clear spectroscopic evidence for the presence of infall toward the central protostar. These results have a reasonable consistency with the initial conditions given in one of the extreme paradigms for core collapse scenario - the runaway collapse solution - debated over the four decades. The authors believe that the core has been undergoing gravitational collapse for about 5,000 yrs since the protostar formation and that the gravitationally unstable state initiated the collapse 2 ×105 yrs (the free-fall time) ago.
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