The angular momentum of condensations within elephant trunks

Abstract

The radiation from newly born stars photoevaporates their parental neutral cloud, leading to the formation of dense clumps that will eventually form stars. We present 3D simulations of the interaction of a neutral cloud with an external ionising radiation field, and compute the angular momenta of these collapsing clumps. The angular momenta of these collapsing clumps show that they have preferential orient mostly perpendicular to the direction of the incident ionising photon field. Therefore, the axes of the jet systems that will be eventually ejected (from the star + accretion disk systems that will form) will be oriented approximately perpendicular to the direction to the photoionising source.

6 pages, 7 figures, accepted in Astronomy and Astrophysics

References in corpus (2)

• Driving Turbulence and Triggering Star Formation by Ionizing Radiation
• Properties of protostars in the Elephant Trunk globule IC 1396A

Cited by in corpus (6)

• Detailed Numerical Simulations on the Formation of Pillars around HII-regions
• Dynamical Models for the Formation of Elephant Trunks in H II Regions
• Effects of Magnetic Fields on Photoionised Pillars and Globules
• 3D simulations of pillars formation around HII regions: the importance of shock curvature
• Model of Outgrowths in the Spiral Galaxies NGC 4921 and NGC 7049 and the Origin of Spiral Arms
• The molecular environment of the pillar-like features in the HII region G46.5-0.2