Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.271..743v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, v.271, p.743.
Other
38
Scientific paper
In order to investigate the effects of a hard ultraviolet (uVX) photon field on the formation of large disc galaxies, we have performed 3D hydrodynamic and N-body simulations of the formation of a Milky Way-sized galaxy. We use a TREE-SPH code to follow the collapse of an overdense region with 95 per cent collisionless dark matter and 5 per cent baryonic gas. The principal effect of the UVX flux is to ionize the gas, significantly reducing its ability to dissipate energy by line-cooling mechanisms. We present the results of two simulations starting from the same initial conditions: one of the simulations includes the presence of a uVX radiation field while the other does not. Based on the results of these and other simulations, we conclude that a background uVX radiation field can significantly affect not only the formation of small galaxies, as proposed by Efstathiou, but also the global properties of large disc galaxies. Key words: hydrodynamics - galaxies: evolution - galaxies: formation - diffuse radiation.
Hellsten Uffe
Sommer-Larsen Jesper
Vedel Henrik
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