Massive star formation via high accretion rates and early disk-driven outflows

Details Massive star formation via high accretion rates and early disk-driven outflows Massive star formation via high accretion rates and early disk-driven outflows

2006-12-22

arxiv.org/abs/astro-ph/0612674v1

Astrophys.J.660:479-488,2007

Astronomy and Astrophysics

Astrophysics

22 pages, 12 figures, aastex style, accepted for publication in ApJ, see http://www.ita.uni-heidelberg.de/~banerjee/publicatio

Scientific paper

10.1086/512010

We present an investigation of massive star formation that results from the gravitational collapse of massive, magnetized molecular cloud cores. We investigate this by means of highly resolved, numerical simulations of initial magnetized Bonnor-Ebert-Spheres that undergo collapse and cooling. By comparing three different cases - an isothermal collapse, a collapse with radiative cooling, and a magnetized collapse - we show that massive stars assemble quickly with mass accretion rates exceeding 10^-3 Msol/yr. We confirm that the mass accretion during the collapsing phase is much more efficient than predicted by selfsimilar collapse solutions, i.e. dM/dt ~ c^3/G. We find that during protostellar assembly the mass accretion reaches 20 - 100 c^3/G. Furthermore, we determined the self-consistent structure of bipolar outflows that are produced in our three dimensional magnetized collapse simulations. These outflows produce cavities out of which radiation pressure can be released, thereby reducing the limitations on the final mass of massive stars formed by gravitational collapse. Moreover, we argue that the extraction of angular momentum by disk-threaded magnetic fields and/or by the appearance of bars with spiral arms significantly enhance the mass accretion rate, thereby helping the massive protostar to assemble more quickly.

Affiliated with

Also associated with

No associations

Rating

Massive star formation via high accretion rates and early disk-driven outflows 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 Massive star formation via high accretion rates and early disk-driven outflows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive star formation via high accretion rates and early disk-driven outflows will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-530085