Numerical simulations of effects of feedback from protostars, massive stars, and supernovae on the nearby environment. Simulations of outflow-driven feedback by implementing detailed jet/disk-wind models, and investigation of the various feedback processes regulating regulate star formation.

Protostars affect the surrounding ISM in a number of ways – they eject high-velocity jets and outflows, and later emit strong stellar winds and radiation. In addition to this local feedback, larger-scale processes such as spiral arm perturbations, gravitational disk instabilities, or central black hole activity can play a role. During the first funding period, jet formation and outflows from protostellar disks were simulated, showing how the disk dynamics change due to the mass loss. The mass loading of the jets was studied for different configurations such as strong or weak magnetization. Moreover, we studied how jets interact with the interstellar medium of the host molecular cloud, and how this relates to external feedback processes. The progress of B4 was slower than anticipated due to technical difficulties and the paternal leave of one of the scientists, but a number of refereed papers have already been published and more are to come.

Publications

Gaibler, V., Khochfar, S., Krause, M., Silk, J: "Jet-induced star formation in gas-rich galaxies". MNRAS, 425, 438 (2012)

Sheikhnezami, S., Fendt, Ch., Porth, O., Vaidya, B., Ghanbari, J.: "Bipolar jets launched from magnetically diffusive accretion disks. I. Ejection efficiency versus field strength and diffusivity", ApJ, 757, 65 (2012)

Silk, J., Antonuccio-Delogu, V., Dubois, Y., Gaibler, V., Haas, M. R., Khochfar, S., Krause, M.: "Jet interactions with a giant molecular cloud in the Galactic centre and ejection of hypervelocity stars". A&A 545, 11 (2012)

Fendt, Ch., Sheikhnezami, S.: "Bipolar jets launched from accretion disks. II. The formation of asymmetric jets and counter jets". ApJ, 774, 12 (2013)

Gaibler, V.: "Asymmetries of AGN jets in inhomogeneous media". IJMP, Vol. 28, id. 1460192 Gaibler, V.: "Positive and negative feedback by AGN jets in high-redshift galaxies". Reviews in Modern Astronomy, Vol. 26, accepted