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Evolution of the Bar Fraction in COSMOS: Quantifying the Assembly of the Hubble Sequence
We have analyzed the redshift-dependent fraction of galactic bars over 0.2 < z < 0.84 in 2157 luminous face-on spiral galaxies from the COSMOS 2 deg2 field. Our sample is an order of magnitude larger…
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Rapid Formation of Exponential Disks and Bulges at High Redshift from the Dynamical Evolution of Clump-Cluster and Chain Galaxies
Many galaxies at high redshift have peculiar morphologies dominated by 108-109 M☉ kpc-sized clumps. Using numerical simulations, we show that these "clump clusters" can result from fragmentation in…
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BULGE AND CLUMP EVOLUTION IN HUBBLE ULTRA DEEP FIELD CLUMP CLUSTERS, CHAINS AND SPIRAL GALAXIES
Clump clusters and chain galaxies in the Hubble Ultra Deep Field (UDF) are examined for bulges in Near-Infrared Camera Multi-Object Spectrometer images. Approximately 50% of the clump clusters and…
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Star formation sustained by gas accretion
Numerical simulations predict that metal-poor gas accretion from the cosmic web fuels the formation of disk galaxies. This paper discusses how cosmic gas accretion controls star formation, and…
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Stellar Populations in 10 Clump-Cluster Galaxies of the Hubble Ultra Deep Field
Color-color diagrams for the clump and interclump emission in 10 clump-cluster galaxies of the Hubble Ultra Deep Field (UDF) are made from B,V, i, and z images and compared with models to determine…
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Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
The photometric redshift distributions, spectral types, Sérsic indices, and sizes of all resolved galaxies in the Hubble Space Telescope Ultra Deep Field (UDF) are studied in order to understand the…
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RECONSTRUCTING THE STELLAR MASS DISTRIBUTIONS OF GALAXIES USING S4G IRAC 3.6 AND 4.5 μm IMAGES. I. CORRECTING FOR CONTAMINATION BY POLYCYCLIC AROMATIC HYDROCARBONS, HOT DUST, AND INTERMEDIATE-AGE…
With the aim of constructing accurate two-dimensional maps of the stellar mass distribution in nearby galaxies from Spitzer Survey of Stellar Structure in Galaxies 3.6 and 4.5 μm images, we report on…
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Properties of barred spiral galaxies.
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Optical Tracers of Spiral Wave Resonances in Galaxies: II. Hidden Three-Arm Spirals in a Sample of 18 Galaxies
Computer-enhanced galaxy images reveal underlying spiral structures with three symmetric arms that extend between ∼25% and ∼85% of the outer radii of the two-arm spirals. Many of the galaxies…
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A Constant Bar Fraction out to Redshift z ~ 1 in the Advanced Camera for Surveys Field of the Tadpole Galaxy
Barlike structures were investigated in a sample of 186 disk galaxies larger than 0.″5 that are in the I-band image of the Tadpole galaxy taken with the Hubble Space Telescope Advanced Camera for…
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