Simulation of radiation-driven winds from disc galaxies

作者：Chattopadhyay Indranil^*; Sharma Mahavir; Nath Biman B; Ryu Dongsu

来源：Monthly Notices of the Royal Astronomical Society, 2012, 423(3): 2153-2161.

DOI：10.1111/j.1365-2966.2012.21027.x

• galaxies: formation
• intergalactic medium
• galaxies: starburst

We present two-dimensional (2D) hydrodynamic simulation of rotating galactic winds driven by radiation. We study the structure and dynamics of the cool and/or warm component (T? 104 K) which is mixed with dust. We have taken into account the total gravity of a galactic system that consists of a disc, a bulge and a dark matter halo. We find that the combined effect of gravity and radiation pressure from a realistic disc drives the gas away to a distance of similar to 5 kpc in similar to 37 Myr for typical galactic parameters. The outflow speed increases rapidly with the disc Eddington parameter G0(=?I/(2cGS)) for G0= 1.5. We find that the rotation speed of the outflowing gas is ?100 km s-1. The wind is confined in a cone that mostly consists of low angular momentum gas lifted from the central region.

• 出版日期2012-7