Search Publications
From Rings to Bulges: Evidence for Rapid Secular Galaxy Evolution at z ~ 2 from Integral Field Spectroscopy in the SINS Survey
Lutz, D.; Cimatti, A.; Daddi, E. +22 more
We present Hα integral field spectroscopy of well-resolved, UV/optically selected z ~ 2 star-forming galaxies as part of the SINS survey with SINFONI on the ESO VLT. Our laser guide star adaptive optics and good seeing data show the presence of turbulent rotating star-forming outer rings/disks, plus central bulge/inner disk components, whose mass …
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
Barro, Guillermo; Pérez-González, Pablo G.; Rieke, George H. +8 more
Using a sample of ~28,000 sources selected at 3.6-4.5 µm with Spitzer observations of the Hubble Deep Field North, the Chandra Deep Field South, and the Lockman Hole (surveyed area ~664 arcmin2), we study the evolution of the stellar mass content of the universe at 0 < z < 4. We calculate stellar masses and photometric redsh…
The Evolution of Galaxy Mergers and Morphology at z < 1.2 in the Extended Groth Strip
Le Floc'h, E.; Papovich, C.; Cooper, M. +18 more
We present the quantitative rest-frame B morphological evolution and galaxy merger fraction at 0.2 < z < 1.2 as observed by the All-Wavelength Extended Groth Strip International Survey (AEGIS). We use the Gini coefficient and M20 to identify major mergers and classify galaxy morphology for a volume-limited sample of 3009 galaxies …
The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
Treu, Tommaso; Schlegel, David J.; Gavazzi, Raphaël +5 more
We present the definitive data for the full sample of 131 strong gravitational lens candidates observed with the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope by the Sloan Lens ACS (SLACS) Survey. All targets were selected for higher redshift emission lines and lower redshift continuum in a single Sloan Digital Sky Survey (SD…
Structure and Star Formation in Galaxies out to z = 3: Evidence for Surface Density Dependent Evolution and Upsizing
van Dokkum, Pieter G.; Franx, Marijn; Labbé, Ivo +3 more
We present an analysis of galaxies in the CDF-South. We find a tight relation to z = 3 between color and size at a given mass, with red galaxies being small, and blue galaxies being large. We show that the relation is driven by stellar surface density or inferred velocity dispersion: galaxies with high surface density are red and have low specific…
The Horizontal Magnetic Flux of the Quiet-Sun Internetwork as Observed with the Hinode Spectro-Polarimeter
Kubo, M.; Lites, B. W.; Ichimoto, K. +11 more
Observations of very quiet Sun using the Solar Optical Telescope/Spectro-Polarimeter (SOT/SP) aboard the Hinode spacecraft reveal that the quiet internetwork regions are pervaded by horizontal magnetic flux. The spatial average horizontal apparent flux density derived from wavelength-integrated measures of Zeeman-induced linear polarization is B
Size Evolution of the Most Massive Galaxies at 1.7 < z < 3 from GOODS NICMOS Survey Imaging
Dickinson, Mark; Conselice, Christopher J.; Bouwens, Rychard J. +3 more
We measure the sizes of 82 massive (M >= 1011 M⊙) galaxies at 1.7 <= z <= 3 utilizing deep HST NICMOS data taken in the GOODS North and South fields. Our sample is almost an order of magnitude larger than previous studies at these redshifts, providing the first statistical study of massive galaxy sizes at z > 2, c…
Evolution of the Bar Fraction in COSMOS: Quantifying the Assembly of the Hubble Sequence
Mobasher, Bahram; Schinnerer, Eva; Ellis, Richard S. +13 more
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 than that used in any previous investigation, and is based on substantially deeper imaging data than that available from earlier wid…
Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Bournaud, Frédéric
Gas-rich disks in the early universe are highly turbulent and have giant star-forming clumps. Models suggest that the clumps form by gravitational instabilities, and if they resist disruption by star formation, then they interact, lose angular momentum, and migrate to the center to form a bulge. Here we study the properties of the bulges formed by…
Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High-z Surveys
Trenti, M.; Stiavelli, M.
We study cosmic variance in deep high-redshift surveys and its influence on the determination of the luminosity function for high-redshift galaxies. For several survey geometries relevant for Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) instruments, we characterize the distribution of the galaxy number counts. This is obtaine…