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Calderón, D.; Ballone, A.; Cuadra, J.; Schartmann, M.; Burkert, A. and Gillessen, S. (2016): Clump formation through colliding stellar winds in the Galactic Centre. In: Monthly Notices of the Royal Astronomical Society, Vol. 455, No. 4: pp. 4388-4398

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The gas cloud G2 is currently being tidally disrupted by the Galactic Centre supermassive black hole, Sgr A*. The region around the black hole is populated by similar to 30 Wolf-Rayet stars, which produce strong outflows. We explore the possibility that gas clumps, such as G2, originate from the collision of stellar winds via the non-linear thin shell instability. Following an analytical approach, we study the thermal evolution of slabs formed in the symmetric collision of winds, evaluating whether instabilities occur, and estimating possible clump masses. We find that the collision of relatively slow (less than or similar to 750 km s(-1)) and strong (similar to 10(-5) M-circle dot yr(-1)) stellar winds from stars at short separations (< 10 mpc) is a process that indeed could produce clumps of G2's mass and above. Such short separation encounters of single stars along their known orbits are not common in the Galactic Centre, making this process a possible but unlikely origin for G2. We also discuss clump formation in close binaries such as IRS 16SW and in asymmetric encounters as promising alternatives that deserve further numerical study.

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