Journal Article

Simulation of radiation-driven winds from disc galaxies

Indranil Chattopadhyay, Mahavir Sharma, Biman B. Nath and Dongsu Ryu

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 3, pages 2153-2161
Published in print July 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21027.x
Simulation of radiation-driven winds from disc galaxies

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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 ∼5 kpc in ∼37 Myr for typical galactic parameters. The outflow speed increases rapidly with the disc Eddington parameter Γ0(=κI/(2cGΣ)) for Γ0≥ 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.

Keywords: galaxies: formation; intergalactic medium; galaxies: starburst

Journal Article.  6019 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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