Search Publications
Tracing the Reionization Epoch with ALMA: [C II] Emission in z ∼ 7 Galaxies
Maiolino, R.; Giavalisco, M.; Castellano, M. +12 more
We present new results on [C II]158 µ {{m}} emission from four galaxies in the reionization epoch. These galaxies were previously confirmed to be at redshifts between 6.6 and 7.15 from the presence of the Lyα emission line in their spectra. The Lyα emission line is redshifted by 100-200 km s-1 compared to the systemic redshift giv…
Early and Extended Helium Reionization over More Than 600 Million Years of Cosmic Time
Hennawi, Joseph F.; Worseck, Gábor; Prochaska, J. Xavier +1 more
We measure the effective optical depth of He II Lyα absorption {τ }{eff,{He}{{II}}} at 2.3\lt z\lt 3.5 in 17 UV-transmitting quasars observed with UV spectrographs on the Hubble Space Telescope. The median {τ }{eff,{He}{{II}}} values increase gradually from 1.95 at z=2.7 to 5.17 at z=3.4, but with a strong sightline-to-sightl…
The Evolution of Galaxy Number Density at z < 8 and Its Implications
Conselice, Christopher J.; Mortlock, Alice; Wilkinson, Aaron +1 more
The evolution of the number density of galaxies in the universe, and thus also the total number of galaxies, is a fundamental question with implications for a host of astrophysical problems including galaxy evolution and cosmology. However, there has never been a detailed study of this important measurement, nor a clear path to answer it. To addre…
The Angular Momentum Distribution and Baryon Content of Star-forming Galaxies at z ∼ 1-3
Wuyts, E.; Lutz, D.; Wuyts, S. +25 more
We analyze the angular momenta of massive star-forming galaxies (SFGs) at the peak of the cosmic star formation epoch (z ∼ 0.8-2.6). Our sample of ∼360 log(M */M ⊙) ∼ 9.3-11.8 SFGs is mainly based on the KMOS3D and SINS/zC-SINF surveys of Hα kinematics, and collectively provides a representative subset of the massi…
The Carnegie-Chicago Hubble Program. I. An Independent Approach to the Extragalactic Distance Scale Using Only Population II Distance Indicators
Kollmeier, Juna A.; Madore, Barry F.; Freedman, Wendy L. +15 more
We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3% measurement of the Hubble constant (H 0) using alternative methods to the traditional Cepheid distance scale. We aim to establish a completely independent route to H 0 using RR Lyrae variables, the tip of the red giant branch (TRG…
The Redshift Distribution of Dusty Star-forming Galaxies from the SPT Survey
Menten, K. M.; Béthermin, M.; Murphy, E. J. +28 more
We use the Atacama Large Millimeter/submillimeter Array (ALMA) in Cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (DSFGs) selected by their 1.4 mm continuum emission in the South Pole Telescope (SPT) survey. We present ALMA 3 mm spectral scans between 84 and 114 GHz for 15 galaxies and targeted ALMA 1 mm o…
Modeling Dust Evolution in Galaxies with a Multiphase, Inhomogeneous ISM
Jenkins, Edward B.; Klessen, Ralf S.; Zhukovska, Svitlana +1 more
We develop a model of dust evolution in a multiphase, inhomogeneous interstellar medium (ISM) using hydrodynamical simulations of giant molecular clouds in a Milky Way-like spiral galaxy. We improve the treatment of dust growth by accretion in the ISM to investigate the role of the temperature-dependent sticking coefficient and ion-grain interacti…
Direct Detection of Lyman Continuum Escape from Local Starburst Galaxies with the Cosmic Origins Spectrograph
Hernandez, Svea; Leitherer, Claus; Oey, M. S. +1 more
We report on the detection of Lyman continuum radiation in two nearby starburst galaxies. Tol 0440-381, Tol 1247-232, and Mrk 54 were observed with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. The three galaxies have radial velocities of ∼13,000 km s-1, permitting a ∼35 Å window on the restframe Lyman continuum s…
The Offset and Host Light Distributions of Long Gamma-Ray Bursts: A New View From HST Observations of Swift Bursts
Fong, Wen-fai; Berger, Edo; Blanchard, Peter K.
We present the results of an extensive Hubble Space Telescope imaging study of 105, mostly Swift, long-duration gamma-ray bursts (LGRBs) spanning 0.03≲ z≲ 9.4, which were localized using relative astrometry from ground- and space-based afterglow observations. We measure the distribution of LGRB offsets from their host centers and their relation to…
The Evolution of Star Formation Histories of Quiescent Galaxies
Barro, Guillermo; Bell, Eric F.; Ferguson, Henry C. +22 more
Although there has been much progress in understanding how galaxies evolve, we still do not understand how and when they stop forming stars and become quiescent. We address this by applying our galaxy spectral energy distribution models, which incorporate physically motivated star formation histories (SFHs) from cosmological simulations, to a samp…