Brook, C. B. and Governato, F. and Roškar, R. and Stinson, G. and Brooks, A. M. and Wadsley, J. and Quinn, T. and Gibson, B. K. and Snaith, O. and Pilkington, K. and House, E. and Pontzen, A. (2011) Hierarchical formation of bulgeless galaxies: why outflows have low angular momentum. Monthly Notices of the Royal Astronomical Society, 415 (2). pp. 1051-1060. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110826-104731667
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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.
|Additional Information:||© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 February 15. Received 2011 January 24; in original form 2010 September 29. Article first published online: 2 May 2011. CBB and BKG acknowledge the support of the UK’s Science & Technology Facilities Council (STFC Grant ST/F002432/1). CBB and GS thank the DEISA consortium, cofunded through EU FP6 project RI-031513 and the FP7 project RI-222919 for support within the DEISA Extreme Computing Initiative. FG and TQ were supported by NSF ITR grant PHY-0205413. FG acknowledges support from a Theodore Dunham grant, HST GO-1125, NSF grant AST-0607819 and NASA ATP NNX08AG84G. AB acknowledges support from the Sherman Fairchild Foundation. Simulations were run at TACC, ARSC and NAS.We acknowledge the computational support provided by the UK’s National Cosmology Supercomputer, COSMOS.|
|Subject Keywords:||galaxies: bulges; galaxies: evolution; galaxies: formation; galaxies: starburst|
|Official Citation:||Brook, C. B., Governato, F., Roškar, R., Stinson, G., Brooks, A. M., Wadsley, J., Quinn, T., Gibson, B. K., Snaith, O., Pilkington, K., House, E. and Pontzen, A. (2011), Hierarchical formation of bulgeless galaxies: why outflows have low angular momentum. Monthly Notices of the Royal Astronomical Society, 415: 1051–1060. doi: 10.1111/j.1365-2966.2011.18545.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||26 Aug 2011 20:47|
|Last Modified:||26 Aug 2011 20:47|
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