Search Publications
Keck Spectroscopy of 3 < z < 7 Faint Lyman Break Galaxies: The Importance of Nebular Emission in Understanding the Specific Star Formation Rate and Stellar Mass Density
Ellis, Richard; Stark, Daniel P.; Dunlop, James +3 more
The physical properties inferred from the spectral energy distributions (SEDs) of z > 3 galaxies have been influential in shaping our understanding of early galaxy formation and the role galaxies may play in cosmic reionization. Of particular importance is the stellar mass density at early times, which represents the integral of earlier star fo…
CANDELS: The Progenitors of Compact Quiescent Galaxies at z ~ 2
Barro, Guillermo; Pérez-González, Pablo G.; Bell, Eric F. +34 more
We combine high-resolution Hubble Space Telescope/WFC3 images with multi-wavelength photometry to track the evolution of structure and activity of massive (M sstarf > 1010 M ⊙) galaxies at redshifts z = 1.4-3 in two fields of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. We detect compact, …
Fast Molecular Outflows in Luminous Galaxy Mergers: Evidence for Quasar Feedback from Herschel
Lutz, D.; Genzel, R.; Maiolino, R. +18 more
We report the results from a systematic search for molecular (OH 119 µm) outflows with Herschel/PACS in a sample of 43 nearby (z < 0.3) galaxy mergers, mostly ultraluminous infrared galaxies (ULIRGs) and QSOs. We find that the character of the OH feature (strength of the absorption relative to the emission) correlates with that of the 9.7…
The Dust Attenuation Law in Distant Galaxies: Evidence for Variation with Spectral Type
Conroy, Charlie; Kriek, Mariska
This Letter utilizes composite spectral energy distributions (SEDs) constructed from NEWFIRM Medium-Band Survey photometry to constrain the dust attenuation curve in 0.5 < z < 2.0 galaxies. Based on similarities between the full SED shapes (0.3-8 µm), we have divided galaxies in 32 different spectral classes and stacked their photometr…
Two Accurate Time-delay Distances from Strong Lensing: Implications for Cosmology
Treu, T.; Blandford, R. D.; Auger, M. W. +9 more
Strong gravitational lenses with measured time delays between the multiple images and models of the lens mass distribution allow a one-step determination of the time-delay distance, and thus a measure of cosmological parameters. We present a blind analysis of the gravitational lens RXJ1131-1231 incorporating (1) the newly measured time delays from…
CLASH: Three Strongly Lensed Images of a Candidate z ≈ 11 Galaxy
Donahue, Megan; Broadhurst, Tom; Kelson, Daniel D. +20 more
We present a candidate for the most distant galaxy known to date with a photometric redshift of z = 10.7+0.6 -0.4 (95% confidence limits; with z < 9.5 galaxies of known types ruled out at 7.2σ). This J-dropout Lyman break galaxy, named MACS0647-JD, was discovered as part of the Cluster Lensing and Supernova survey with Hub…
A Critical Assessment of Photometric Redshift Methods: A CANDELS Investigation
Papovich, Casey; Finkelstein, Steven L.; Barro, Guillermo +35 more
We present results from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) photometric redshift methods investigation. In this investigation, the results from 11 participants, each using a different combination of photometric redshift code, template spectral energy distributions (SEDs), and priors, are used to examine the…
The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen
Tripp, Todd M.; Prochaska, J. Xavier; Sembach, Kenneth R. +11 more
We present the design and methods of the COS-Halos survey, a systematic investigation of the gaseous halos of 44 z = 0.15-0.35 galaxies using background QSOs observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope. This survey has yielded 39 spectra of z em ~= 0.5 QSOs with S/N ~10-15 per resolution element. The …
A Systematic Retrieval Analysis of Secondary Eclipse Spectra. I. A Comparison of Atmospheric Retrieval Techniques
Knutson, Heather; Line, Michael R.; Kammer, Joshua A. +6 more
Exoplanet atmosphere spectroscopy enables us to improve our understanding of exoplanets just as remote sensing in our own solar system has increased our understanding of the solar system bodies. The challenge is to quantitatively determine the range of temperatures and molecular abundances allowed by the data, which is often difficult given the lo…
Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the First 720 Square Degrees of the South Pole Telescope Survey
Gladders, M. D.; Rest, A.; Foley, R. J. +77 more
We present a catalog of galaxy cluster candidates, selected through their Sunyaev-Zel'dovich (SZ) effect signature in the first 720 deg2 of the South Pole Telescope (SPT) survey. This area was mapped with the SPT in the 2008 and 2009 austral winters to a depth of ~18 µKCMB-arcmin at 150 GHz 550 deg2 of it was…