The Evolution of Sizes and Specific Angular Momenta in Hierarchical Models of Galaxy Formation and Evolution

Abstract

We extend our previous work focused at $z\sim 0$, studying the redshift evolution of galaxy dynamical properties using the state-of-the-art semi-analytic model GAEA: we show that the predicted size-mass relation for disky/star forming and quiescent galaxies is in good agreement with observational estimates, up to $z\sim 2$. Bulge dominated galaxies have sizes that are offset low with respect to observational estimates, mainly due to our implementation of disk instability at high redshift. At large masses, both quiescent and bulge dominated galaxies have sizes smaller than observed. We interpret this as a consequence of our most massive galaxies having larger gas masses than observed, and therefore being more affected by dissipation. We argue that a proper treatment of quasar driven winds is needed to alleviate this problem. Our model compact galaxies have number densities in agreement with observational estimates and they form most of their stars in small and low angular momentum high-$z$ halos. GAEA predicts that a significant fraction of compact galaxies forming at high-$z$ is bound to merge with larger structures at lower redshifts: therefore they are not the progenitors of normal-size passive galaxies at $z=0$. Our model also predicts a stellar-halo size relation that is in good agreement with observational estimates. The ratio between stellar size and halo size is proportional to the halo spin and does not depend on stellar mass but for the most massive galaxies, where AGN feedback leads to a significant decrease of the retention factor (from about 80 per cent to 20 per cent).

Accepted for publication in MNRAS, 17 pages, 11 figures

References in corpus (26)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• The hierarchical formation of the brightest cluster galaxies
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• The SAMI Galaxy Survey: instrument specification and target selection
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
• A fitting formula for the merger timescale of galaxies in hierarchical clustering
• Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• Angular momentum evolution of galaxies in EAGLE
• Why stellar feedback promotes disc formation in simulated galaxies
• Understanding the Structural Scaling Relations of Early-Type Galaxies
• Building disc structure and galaxy properties through angular momentum: The DARK SAGE semi-analytic model
• Elemental Abundances in Milky Way-like Galaxies from a Hierarchical Galaxy Formation Model
• Relations Between the Sizes of Galaxies and their Dark Matter Halos at Redshifts $0<z<3$
• ZFIRE: A KECK/MOSFIRE Spectroscopic Survey of Galaxies in Rich Environments at z~2
• EVLA Observations of Galactic Supernova Remnants: Wide-field Continuum and Spectral-index Imaging
• Observing the End of Cold Flow Accretion using Halo Absorption Systems
• HI-selected Galaxies in Hierarchical Models of Galaxy Formation and Evolution
• Investigating Emission Line Galaxy Surveys with the Sloan Digital Sky Survey Telescope
• The Role of Dissipation in the Scaling Relations of Cosmological Merger Remnants

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• From Peculiar Morphologies to Hubble-type Spirals: The relation between galaxy dynamics and morphology in star-forming galaxies at z~1.5
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