Daniel J. Price, Terrence S. Tricco and Matthew R. Bate

full text pdf (2.0Mb), Accepted to MNRAS 9th March 2012 (arXiv:1203.2933)

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Abstract

We have performed Smoothed Particle Magnetohydrodynamics (SPMHD) simulations demonstrating the production of collimated jets during collapse of 1 solar mass molecular cloud cores to form the `first hydrostatic core' in low mass star formation. Recently a number of candidate first core objects have been observed, including L1448 IRS2E, L1451-mm and Per Bolo 58, although it is not yet clear that these are first hydrostatic cores. Recent observations of Per Bolo 58 in particular appear to show collimated, bipolar outflows which are inconsistent with previous theoretical expectations. We show that low mass first cores can indeed produce tightly collimated jets (opening angles <~ 10 degrees) with speeds of ~2-7 km/s, consistent with some of the observed candidates. We have also demonstrated, for the first time, that such phenomena can be successfully captured in SPMHD simulations.

Movies	Movies and images (c) 2012 Daniel Price, released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. [directory listing of all movies here]
Jets from the first core from Daniel Price on Vimeo.	Downloadable Quicktime version (5Mb Quicktime H.264)
Jets from the first core - magnetic field evolution from Daniel Price on Vimeo.	Downloadable Quicktime version (15Mb Quicktime H.264)
Jets from the first core from Daniel Price on Vimeo.	Downloadable Quicktime version (1Mb Quicktime H.264)
Jets from the first core - comparison of different field strengths from Daniel Price on Vimeo.	Downloadable Quicktime version (0.8Mb Quicktime H.264)

Images