Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-48310
Brook, C B; Governato, F; Roskar, R; Stinson, G; Brooks, A M; Wadsley, J; Quinn, T; Gibson, B K; Snaith, O; Pilkington, K; House, E; Pontzen, A (2011). Hierarchical formation of bulgeless galaxies: why outflows have low angular momentum. Monthly Notices of the Royal Astronomical Society, 415(2):1051-1060.
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Using high resolution, fully cosmological smoothed particle hydrodynamical simulations of dwarf galaxies in a Lambda cold dark matter Universe, we show how high redshift gas outflows can modify the baryon angular momentum distribution and allow pure disc galaxies to form. We outline how galactic outflows preferentially remove low angular momentum material due a combination of (a) star formation peaking at high redshift in shallow dark matter potentials, an epoch when accreted gas has relatively low angular momentum, (b) the existence of an extended reservoir of high angular momentum gas in the outer disc to provide material for prolonged SF at later times and (c) the tendency for outflows to follow the path of least resistance which is perpendicular to the disc. We also show that outflows are enhanced during mergers, thus expelling much of the gas which has lost its angular momentum during these events, and preventing the formation of ‘classical’, merger driven bulges in low-mass systems. Stars formed prior to such mergers form a diffuse, extended stellar halo component similar to those detected in nearby dwarfs.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Theoretical Physics|
|Deposited On:||18 Feb 2012 20:57|
|Last Modified:||30 Nov 2013 06:18|
|ISSN:||0035-8711 (P) 1365-2966 (E)|
|Additional Information:||The definitive version is available at www3.interscience.wiley.com|
|Citations:||Web of Science®. Times cited: 48|
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