Protostellar mass accretion rates from gravoturbulent fragmentation

Details Protostellar mass accretion rates from gravoturbulent fragmentation Protostellar mass accretion rates from gravoturbulent fragmentation

2004-02-18

arxiv.org/abs/astro-ph/0402433v1

Astron.Astrophys. 419 (2004) 405

Astronomy and Astrophysics

Astrophysics

13 pages, 6 figures; accepted by A&A

Scientific paper

10.1051/0004-6361:20034375

We analyse protostellar mass accretion rates from numerical models of star formation based on gravoturbulent fragmentation, considering a large number of different environments. To within one order of magnitude, the mass accretion rate is approximately given by the mean thermal Jeans mass divided by the corresponding free-fall time. However, mass accretion rates are highly time-variant, with a sharp peak shortly after the formation of the protostellar core. We present an empirical exponential fit formula to describe the time evolution of the mass accretion and discuss the resulting fit parameters. There is a positive correlation between the peak accretion rate and the final mass of the protostar. We also investigate the relation of the accretion rate with the turbulent flow velocity as well as with the driving wavenumbers in different environments. We then compare our results with other theoretical models of star formation and with observational data.

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