A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc Fragmentation

Details A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc Fragmentation A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc Fragmentation

2011-10-19

arxiv.org/abs/1110.4212v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 19 figures, 1 table, accepted for publication in MNRAS

Scientific paper

We attempt to verify recent claims (made using semi-analytic models) that for the collapse of spherical homogeneous molecular clouds, fragmentation of the self-gravitating disc that subsequently forms can be predicted using the cloud's initial angular momentum alone. In effect, this condition is equivalent to requiring the resulting disc be sufficiently extended in order to fragment, in line with studies of isolated discs. We use smoothed particle hydrodynamics with hybrid radiative transfer to investigate this claim, confirming that in general, homogeneous spherical molecular clouds will produce fragmenting self-gravitating discs if the ratio of rotational kinetic energy to gravitational potential energy is greater than ~ 5e-3, where this result is relatively insensitive to the initial thermal energy. This condition begins to fail at higher cloud masses, suggesting that sufficient mass at large radii governs fragmentation. While these results are based on highly idealised initial conditions, and may not hold if the disc's accretion from the surrounding envelope is sufficiently asymmetric, or if the density structure is perturbed, they provide a sensible lower limit for the minimum angular momentum required to fragment a disc in the absence of significant external turbulence.

Affiliated with

Also associated with

No associations

Rating

A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc 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 A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc Fragmentation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Lower Angular Momentum Limit for Self-Gravitating Protostellar Disc Fragmentation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-597172