Hierarchical formation of bulgeless galaxies: why outflows have low angular momentum
Chris B. Brook,Fabio Governato,Rok Roškar,Rok Roškar,G. S. Stinson,Alyson Brooks,James Wadsley,Thomas R. Quinn,Brad K. Gibson,Owain Snaith,K. Pilkington,Elisa L. House,Andrew Pontzen +12 more
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In this paper, the authors show how high redshift gas outflows can modify the baryon angular momentum distribution and allow pure disc galaxies to form, and 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.Abstract:
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.read more
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Galaxies on FIRE (Feedback In Realistic Environments): stellar feedback explains cosmologically inefficient star formation
Philip F. Hopkins,Philip F. Hopkins,Dušan Kereš,Jose Oñorbe,Claude André Faucher-Giguère,Claude André Faucher-Giguère,Eliot Quataert,Norman Murray,James S. Bullock +8 more
TL;DR: In this paper, the authors present a series of high-resolution cosmological simulations of galaxy formation to z = 0, spanning halo masses ∼ 10.8−10.13−M⊙, and stellar masses ∼10.4−10^(11)
Journal ArticleDOI
The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
Robert A. Crain,Robert A. Crain,Joop Schaye,Richard G. Bower,Michelle Furlong,Matthieu Schaller,Tom Theuns,Claudio Dalla Vecchia,Claudio Dalla Vecchia,Carlos S. Frenk,Ian G. McCarthy,John C. Helly,Adrian Jenkins,Yetli Rosas-Guevara,Simon D. M. White,James W. Trayford +15 more
TL;DR: In this article, the authors present results from thirteen cosmological simulations that explore the parameter space of the "Evolution and Assembly of GaLaxies and their Environments" (EAGLE) simulation project.
Journal ArticleDOI
3D-HST+CANDELS: THE EVOLUTION OF THE GALAXY SIZE–MASS DISTRIBUTION SINCE z = 3
A. van der Wel,Marijn Franx,P. G. van Dokkum,Rosalind E. Skelton,Ivelina Momcheva,Katherine E. Whitaker,Gabriel B. Brammer,Eric F. Bell,Hans-Walter Rix,Stijn Wuyts,Henry C. Ferguson,Bradford P. Holden,Guillermo Barro,Anton M. Koekemoer,Yu-Yen Chang,Elizabeth J. McGrath,B. Haussler,B. Haussler,Avishai Dekel,Peter Behroozi,Michele Fumagalli,Joel Leja,Britt Lundgren,Michael V. Maseda,Erica J. Nelson,David A. Wake,David A. Wake,Shannon G. Patel,Ivo Labbé,Sandra M. Faber,Norman A. Grogin,Dale D. Kocevski +31 more
TL;DR: In this paper, the galaxy size-mass distribution over the redshift range 0 3 × 10{sup 9} M {sub ☉}, and steep, R{sub eff}∝M{sub ∗}{sup 0.75}, for early-type galaxies with stellar mass > 2 × 10,sup 10} M{sub ǫ, and the intrinsic scattermore is ≲0.2 dex for all galaxy types and redshifts.
Journal ArticleDOI
How supernova feedback turns dark matter cusps into cores
Andrew Pontzen,Fabio Governato +1 more
TL;DR: In this article, the authors proposed and successfully test against new cosmological simulations a novel analytical description of the physical processes associated with the origin of cored dark matter density profiles, demonstrating how fluctuations in the central potential irreversibly transfer energy into collisionless particles, thus generating a dark matter core.
Journal ArticleDOI
FIRE-2 simulations: physics versus numerics in galaxy formation
Philip F. Hopkins,Andrew Wetzel,Andrew Wetzel,Andrew Wetzel,Dušan Kereš,Claude André Faucher-Giguère,Eliot Quataert,Michael Boylan-Kolchin,Norman Murray,Christopher C. Hayward,Shea Garrison-Kimmel,Cameron Hummels,Robert Feldmann,Robert Feldmann,Paul Torrey,Xiangcheng Ma,Daniel Anglés-Alcázar,Kung-Yi Su,Matthew E. Orr,Denise Schmitz,Ivanna Escala,Robyn E. Sanderson,Michael Y. Grudić,Zachary Hafen,Ji-hoon Kim,Alex Fitts,James S. Bullock,Coral Wheeler,T. K. Chan,Oliver D. Elbert,Desika Narayanan +30 more
TL;DR: The Feedback In Realistic Environments (FIRE) project explores feedback in cosmological galaxy formation simulations as mentioned in this paper, which has been used to explore new physics (e.g. magnetic fields).
References
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The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
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TL;DR: Galaxy Evolution Explorer (GALEX) as discussed by the authors performed the first space UV sky survey, including imaging and grism surveys in two bands (1350-1750 Angstroms and 1750-2750 angstroms).