Quiescent and coherent cores from gravoturbulent fragmentation

Details Quiescent and coherent cores from gravoturbulent fragmentation Quiescent and coherent cores from gravoturbulent fragmentation

2003-06-03

arxiv.org/abs/astro-ph/0306055v2

Astrophys.J.620:786-794,2005

Astronomy and Astrophysics

Astrophysics

ApJ, in press

Scientific paper

10.1086/427255

[abridged] We investigate the velocity structure of protostellar cores that result from non-magnetic numerical models of the gravoturbulent fragmentation of molecular cloud material. A large fraction of the cores analyzed are ``quiescent'', and more than half are identified as ``coherent''. The fact that dynamically evolving cores in highly supersonic turbulent flows can be quiescent may be understood because cores lie at the stagnation points of convergent turbulent flows, where compression is at a maximum, and relative velocity differences are at a minimum. The coherence may be due to an observational effect related to the length and concentration of the material contributing to the line. The velocity dispersion of the our cores often has its local maximum at small offsets from the column density maximum, suggesting that the core is the dense region behind a shock. Such a configuration is often found in observations of molecular cloud cores, and argues in favor of the gravoturbulent scenario of stellar birth as it is not expected in star-formation models based on magnetic mediation. Cores with collapsed objects tend to be near equipartition between their gravitational and kinetic energies, while cores without collapsed objects tend to be gravitationally unbound, suggesting that gravitational collapse occurs immediately after gravity becomes dominant. Finally, cores in simulations driven at large scales are more frequently quiescent and coherent, and have more realistic ratios of $M_{\rm vir}/M$, supporting the notion that molecular cloud turbulence is driven at large scales.

Affiliated with

Also associated with

No associations

Rating

Quiescent and coherent cores from gravoturbulent fragmentation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quiescent and coherent cores from gravoturbulent fragmentation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quiescent and coherent cores from gravoturbulent fragmentation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-79339