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| EPoS Contribution |
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Massive bound clumps are neither massive nor bound
Veli-Matti Pelkonen ICCUB, Barcelona, ES | |
| Massive bound clumps are thought to be progenitors of massive stars. In this contribution, we show using synthetic observations that not only is the mass of the observed massive sources overestimated due to the line-of-sight confusion, but the observed anti-correlation between the virial parameter and the source mass is due to this mass overestimation. The virial parameter is not correlated with the true 3D clump mass, and even the massive 3D clumps are mostly unbound. Thus, the massive stars must form from bound low-mass cores and accrete over time via inertial inflows, rather than forming via core-collapse. | |
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| Caption: Virial parameter vs. mass. Solid blue line is the fit to the actual 3D clumps in the MHD simulation (blue circles), while the dashed black line shows the observational fit (similar to real observations) to 2D synthetic sources. | |
| Collaborators: Z. Lu, ICCUB, ES P. Padoan, ICCUB, ES M. Juvela, HY, FI T. Haugbolle, KU, DK A. Nordlund, KU, DK |
Key publication
Suggested Session: Cores |