Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 415, Issue 2, Pages 1051-1060Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18545.x
Keywords
galaxies: bulges; galaxies: evolution; galaxies: formation; galaxies: starburst
Categories
Funding
- UK's Science & Technology Facilities Council (STFC) [ST/F002432/1]
- EU within the DEISA Extreme Computing Initiative [RI-031513, RI-222919]
- NSF [PHY-0205413, AST-0607819]
- Theodore Dunham grant [HST GO-1125]
- NASA [ATP NNX08AG84G]
- Sherman Fairchild Foundation
- Science and Technology Facilities Council [ST/G003025/1, ST/F002432/1, ST/F007701/1] Funding Source: researchfish
- STFC [ST/F002432/1, ST/G003025/1, ST/F007701/1] Funding Source: UKRI
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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.
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