天文学教室談話会

last-update:2018/02/14

  次回第1647回 2018年2月20日(火) 16:00-17:00

The slingshot mechanism in star forming gas filaments
Tjarda Boekholt (University of Aveiro)
Recent observations of the integral shaped filament (ISF) in Orion A reveal a major contradiction in star formation. The protostars are born in the center of the deep gravitational potential well of the gas filament, in a narrow and cold distribution. Young disk stars on the other hand are more spread out, both in position and velocity. This implies that the stars are dynamically heated. What mechanism can heat up the stars in a gas mass dominated system? In such systems strong stellar encounters are suppressed and very close stellar separations of order <200 AU are not observed. The contradiction can be resolved by realizing that the filament itself can act as the source of energy. Recent studies show that the interaction of a gas filament with a helical magnetic field can lead to an oscillatory motion of the filament. As a result, stars can get ejected from the filament and thereby get dynamically heated. Using numerical simulations that combine an analytical gravitational potential for the gas filament to N-body dynamics of the stars, we confirm that the "Slingshot mechanism" can indeed heat up the stars in a manner that is similar to the observed spread of young stars in the ISF. We motivate follow up work on this subject to better understand the origin of oscillating gas filaments and the consequences for star (cluster) formation. (Presentation file is prepared in English, spoken in English) PDF

 

  今後の予定

2018年2月20日(火) Tjarda Boekholt (University of Aveiro)

2018年4月10日(火) Anaël Wünsche (Institut de Planétologie et d’Astrophysique de Grenoble)

 

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