Search Publications
The Sins Survey of z ~ 2 Galaxy Kinematics: Properties of the Giant Star-forming Clumps
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +24 more
We have studied the properties of giant star-forming clumps in five z ~ 2 star-forming disks with deep SINFONI AO spectroscopy at the ESO VLT. The clumps reside in disk regions where the Toomre Q-parameter is below unity, consistent with their being bound and having formed from gravitational instability. Broad Hα/[N II] line wings demonstrate that…
Ultraviolet Luminosity Functions from 132 z ~ 7 and z ~ 8 Lyman-break Galaxies in the Ultra-deep HUDF09 and Wide-area Early Release Science WFC3/IR Observations
Trenti, M.; Oesch, P. A.; Carollo, C. M. +8 more
We identify 73 z ~ 7 and 59 z ~ 8 candidate galaxies in the reionization epoch, and use this large 26-29.4 AB mag sample of galaxies to derive very deep luminosity functions to < - 18 AB mag and the star formation rate (SFR) density at z ~ 7 and z ~ 8 (just 800 Myr and 650 Myr after recombination, respectively). The galaxy sample is derived usi…
Massive Molecular Outflows and Negative Feedback in ULIRGs Observed by Herschel-PACS
Lutz, D.; Genzel, R.; Maiolino, R. +13 more
Mass outflows driven by stars and active galactic nuclei (AGNs) are a key element in many current models of galaxy evolution. They may produce the observed black-hole-galaxy mass relation and regulate and quench both star formation in the host galaxy and black hole accretion. However, observational evidence of such feedback processes through outfl…
A Photometric Redshift of z ~ 9.4 for GRB 090429B
Sakamoto, T.; D'Avanzo, P.; Greiner, J. +33 more
Gamma-ray bursts (GRBs) serve as powerful probes of the early universe, with their luminous afterglows revealing the locations and physical properties of star-forming galaxies at the highest redshifts, and potentially locating first-generation (Population III) stars. Since GRB afterglows have intrinsically very simple spectra, they allow robust re…
The NEWFIRM Medium-band Survey: Photometric Catalogs, Redshifts, and the Bimodal Color Distribution of Galaxies out to z ~ 3
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +15 more
We present deep near-IR (NIR) medium-bandwidth photometry over the wavelength range 1-1.8 µm in the All-wavelength Extended Groth strip International Survey (AEGIS) and Cosmic Evolution Survey (COSMOS) fields. The observations were carried out using the NOAO Extremely Wide-Field Infrared Imager (NEWFIRM) on the Mayall 4 m Telescope on Kitt P…
The Spitzer Ice Legacy: Ice Evolution from Cores to Protostars
Öberg, Karin I.; van Dishoeck, Ewine F.; Pontoppidan, Klaus M. +5 more
Ices regulate much of the chemistry during star formation and account for up to 80% of the available oxygen and carbon. In this paper, we use the Spitzer c2d Legacy ice survey, complimented with data sets on ices in cloud cores and high-mass protostars, to determine standard ice abundances and to present a coherent picture of the evolution of ices…
The Major and Minor Galaxy Merger Rates at z < 1.5
Somerville, Rachel S.; Lotz, Jennifer M.; Primack, Joel R. +4 more
Calculating the galaxy merger rate requires both a census of galaxies identified as merger candidates and a cosmologically averaged "observability" timescale langT obs(z)rang for identifying galaxy mergers. While many have counted galaxy mergers using a variety of techniques, langT obs(z)rang for these techniques have been po…
On Star Formation Rates and Star Formation Histories of Galaxies Out to z ~ 3
Koekemoer, Anton M.; Maiolino, Roberto; Daddi, Emanuele +23 more
We compare multi-wavelength star formation rate (SFR) indicators out to z ~ 3 in the GOODS-South field. Our analysis uniquely combines U to 8 µm photometry from FIREWORKS, MIPS 24 µm and PACS 70, 100, and 160 µm photometry from the PEP, and Hα spectroscopy from the SINS survey. We describe a set of conversions that lead to a cont…
Disequilibrium Carbon, Oxygen, and Nitrogen Chemistry in the Atmospheres of HD 189733b and HD 209458b
Moses, Julianne I.; Fortney, J. J.; Showman, A. P. +8 more
We have developed a one-dimensional photochemical and thermochemical kinetics and diffusion model to study the effects of disequilibrium chemistry on the atmospheric composition of "hot-Jupiter" exoplanets. Here we investigate the coupled chemistry of neutral carbon, hydrogen, oxygen, and nitrogen species on HD 189733b and HD 209458b and we compar…
Heating of the Solar Chromosphere and Corona by Alfvén Wave Turbulence
Cranmer, S. R.; van Ballegooijen, A. A.; DeLuca, E. E. +1 more
A three-dimensional magnetohydrodynamic (MHD) model for the propagation and dissipation of Alfvén waves in a coronal loop is developed. The model includes the lower atmospheres at the two ends of the loop. The waves originate on small spatial scales (less than 100 km) inside the kilogauss flux elements in the photosphere. The model describes the n…