Smoothly-Rising Star Formation Histories During the Reionization Epoch

Abstract

Cosmological hydrodynamic simulations robustly predict that high-redshift galaxy star formation histories (SFHs) are smoothly-rising and vary with mass only by a scale factor. We use our latest simulations to test whether this scenario can account for recent observations at z>=6 from WFC3/IR, NICMOS, and IRAC. Our simulations broadly reproduce the observed ultraviolet (UV) luminosity functions and stellar mass densities and their evolution at z=6-8, all of which are nontrivial tests of the mean SFH. In agreement with observations, simulated galaxies possess blue UV continua owing to young ages (50-150 Myr), low metallicities (0.1-0.5 Zsun), and low dust columns (E(B-V) <= 0.05). Observations imply a near-unity slope in the stellar mass--star formation rate relation at all z=6-8, confirming the prediction that SFH shapes are invariant. Current surveys detect the majority of galaxies with stellar masses exceeding 10^9 Msun and few galaxies less massive than 10^{8.5} Msun, implying that they probe no more than the brightest 30% of the complete star formation and stellar mass densities at z>=6. Finally, we demonstrate that there is no conflict between smoothly-rising SFHs and recent clustering observations. This is because momentum-driven outflows suppress star formation in low-mass halos, leading to overall occupancies of 0.2-0.4 even though the star formation duty cycle is one. This leads to many interesting predictions at z>=4, among them that (1) optically-selected and UV-selected samples largely overlap; (2) few galaxies exhibit significantly suppressed specific star formation rates; and (3) occupancy is constant or increasing with decreasing luminosity. These predictions are in tentative agreement with current observations, but further analysis of existing and upcoming data sets is required in order to test them more thoroughly. (abridged)

25 pages, 14 figures, accepted to MNRAS

References in corpus (67)

• The chemical composition of the Sun
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• UV Star Formation Rates in the Local Universe
• The Mass-Metallicity Relation at z~2
• Observational constraints on Cosmic Reionization
• Cosmological Simulations of Intergalactic Medium Enrichment from Galactic Outflows
• The stellar mass assembly of galaxies from z=0 to z=4. Analysis of a sample selected in the rest-frame near-infrared with Spitzer
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• The Impact of cold gas accretion above a mass floor on galaxy scaling relations
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• Massloss of galaxies due to a UV-background
• Mass, Metal, and Energy Feedback in Cosmological Simulations
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• Feedback and Recycled Wind Accretion: Assembling the z=0 Galaxy Mass Function
• Star formation in AEGIS field galaxies since z=1.1 . Staged galaxy formation, and a model of mass-dependent gas exhaustion
• UV Continuum Slope and Dust Obscuration from z~6 to z~2: The Star Formation Rate Density at High Redshift
• Discovery of z~8 Galaxies in the HUDF from ultra-deep WFC3/IR Observations
• The UV-Optical Color Magnitude Diagram II: Physical Properties and Morphological Evolution On and Off of a Star-Forming Sequence
• A candidate redshift z ~ 10 galaxy and rapid changes in that population at an age of 500 Myr
• Star formation rates and masses of z ~ 2 galaxies from multicolour photometry
• Large Area Survey for z=7 Galaxies in SDF and GOODS-N: Implications for Galaxy Formation and Cosmic Reionization
• The Stellar Mass Density and Specific Star Formation Rate of the Universe at z~7
• The Origin and Evolution of the Mass-Metallicity Relationship for Galaxies: Results from Cosmological N-Body Simulations
• Natural Downsizing in Hierarchical Galaxy Formation
• Population III stars: hidden or disappeared ?
• z~7 Galaxies in the HUDF: First Epoch WFC3/IR Results
• Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF
• Galaxy growth in the concordance $\Lambda$CDM cosmology
• Very blue UV-continuum slopes of low luminosity z~7 galaxies from WFC3/IR: Evidence for extremely low metallicities?
• Galaxies at z = 6 - 9 from the WFC3/IR imaging of the HUDF
• Bursting and Quenching in Massive Galaxies without Major Mergers or AGNs
• On the Stellar Populations and Evolution of Star-Forming Galaxies at 6.3 < z < 8.6
• On the physical properties of z~6-8 galaxies
• The transition from population III to population II-I star formation
• Star formation rates and stellar masses of z=7-8 galaxies from IRAC observations of the WFC3/IR ERS and the HUDF field
• Stellar Populations of Lyman Alpha Emitters at z~6-7: Constraints on the Escape Fraction of Ionizing Photons from Galaxy Building Blocks
• The Galaxy Luminosity Function during the Reionization Epoch
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• Ultradeep Infrared Array Camera Observations of sub-L* z~7 and z~8 Galaxies in the Hubble Ultra Deep Field: the Contribution of Low-Luminosity Galaxies to the Stellar Mass Density and Reionization
• Simulating high-redshift galaxies
• Discovery of a Very Bright Strongly-Lensed Galaxy Candidate at z ~ 7.6
• The Nature and Origin of Low-Redshift O VI Absorbers
• The Stellar Masses and Star Formation Histories of Galaxies at z ~ 6: Constraints from Spitzer Observations in the Great Observatories Origins Deep Survey
• On the Stellar Masses of IRAC detected Lyman Break Galaxies at z~3
• The Stellar Mass Density at z~6 from Spitzer Imaging of i-drop Galaxies
• Lyman-break galaxies at z~5 -I. First significant stellar mass assembly in galaxies that are not simply z~3 LBGs at higher redshift
• Specific star-formation and the relation to stellar mass from 0<z<2 as seen in the far-infrared at 70 and 160mu
• How is Star Formation Quenched in Massive Galaxies?
• On the Interstellar Medium and Star Formation Demographics of Galaxies in the Local Universe
• Metal-Free Gas Supply at the Edge of Reionization: Late-Epoch Population III Star Formation
• Mapping the Dark Matter From UV Light at High Redshift: An Empirical Approach to Understand Galaxy Statistics
• How do galaxies acquire their mass?
• Constraints on Physical Properties of z~6 Galaxies Using Cosmological Hydrodynamic Simulations
• Stars quenching stars: how photoionization by local sources regulates gas cooling and galaxy formation
• Simulations of the formation and evolution of isolated dwarf galaxies
• The physical properties of Lyalpha emitting galaxies: not just primeval galaxies?
• Absence of Evidence Is Not Evidence of Absence: The Color-Density Relation at Fixed Stellar Mass Persists to z ~ 1
• A systematic search for very massive galaxies at z > 4
• Evidence for a fast evolution of the UV luminosity function beyond redshift 6 from a deep HAWK-I survey of the GOODS-S field
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• Spectroscopy of luminous z>7 galaxy candidates and sources of contamination in z>7 galaxy searches
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• The Density and Spectral Energy Distributions of Red Galaxies at z~3.7
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