Search Publications
Q1549-C25: A Clean Source of Lyman-Continuum Emission at z = 3.15
Siana, Brian; Shapley, Alice E.; Steidel, Charles C. +5 more
We present observations of Q1549-C25, an ∼ {L}* star-forming galaxy at z = 3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermo…
The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
Wilner, David J.; Cleeves, L. Ilsedore; Andrews, Sean M. +4 more
The spatial distribution of gas and solids in protoplanetary disks determines the composition and formation efficiency of planetary systems. A number of disks show starkly different distributions for the gas and small grains compared to millimeter-centimeter-sized dust. We present new Atacama Large Millimeter/Submillimeter Array observations of th…
Beyond 31 mag arcsec-2: The Frontier of Low Surface Brightness Imaging with the Largest Optical Telescopes
Trujillo, Ignacio; Fliri, Jüergen
The detection of structures in the sky with optical surface brightnesses fainter than 30 mag arcsec-2 (3σ in 10 × 10 arcsec boxes; r-band) has remained elusive in current photometric deep surveys. Here we show how present-day telescopes of 10 m class can provide broadband imaging 1.5-2 mag deeper than most previous results within a reas…
The Atmospheric Circulation of a Nine-hot-Jupiter Sample: Probing Circulation and Chemistry over a Wide Phase Space
Fortney, Jonathan J.; Sing, David K.; Kataria, Tiffany +4 more
We present results from an atmospheric circulation study of nine hot Jupiters that compose a large transmission spectral survey using the Hubble and Spitzer Space Telescopes. These observations exhibit a range of spectral behavior over optical and infrared wavelengths, suggesting diverse cloud and haze properties in their atmospheres. By utilizing…
The Bright End of the z ∼ 9 and z ∼ 10 UV Luminosity Functions Using All Five CANDELS Fields*
Trenti, M.; Oesch, P. A.; Fazio, G. G. +14 more
The deep, wide-area (∼800-900 arcmin2) near-infrared/WFC3/IR + Spitzer/IRAC observations over the CANDELS fields have been a remarkable resource for constraining the bright end of high-redshift UV luminosity functions. However, the lack of Hubble Space Telescope (HST) 1.05 µm observations over the CANDELS fields has made it diffic…
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…