Search Publications
Validation of the Equilibrium Model for Galaxy Evolution to z ~ 3 through Molecular Gas and Dust Observations of Lensed Star-forming Galaxies
Saintonge, Amélie; Berta, Stefano; Wuyts, Stijn +11 more
We combine IRAM Plateau de Bure Interferometer and Herschel PACS and SPIRE measurements to study the dust and gas contents of high-redshift star-forming galaxies. We present new observations for a sample of 17 lensed galaxies at z = 1.4-3.1, which allow us to directly probe the cold interstellar medium of normal star-forming galaxies with stellar …
Direct Imaging of a Cold Jovian Exoplanet in Orbit around the Sun-like Star GJ 504
Kuzuhara, M.; Tamura, M.; Ishii, M. +54 more
Several exoplanets have recently been imaged at wide separations of >10 AU from their parent stars. These span a limited range of ages (<50 Myr) and atmospheric properties, with temperatures of 800-1800 K and very red colors (J - H > 0.5 mag), implying thick cloud covers. Furthermore, substantial model uncertainties exist at these young a…
Chemical Consequences of the C/O Ratio on Hot Jupiters: Examples from WASP-12b, CoRoT-2b, XO-1b, and HD 189733b
Moses, J. I.; Madhusudhan, N.; Visscher, C. +1 more
Motivated by recent spectroscopic evidence for carbon-rich atmospheres on some transiting exoplanets, we investigate the influence of the C/O ratio on the chemistry, composition, and spectra of extrasolar giant planets both from a thermochemical equilibrium perspective and from consideration of disequilibrium processes like photochemistry and tran…
What Determines the Density Structure of Molecular Clouds? A Case Study of Orion B with Herschel
Hill, T.; André, Ph.; Arzoumanian, D. +19 more
A key parameter to the description of all star formation processes is the density structure of the gas. In this Letter, we make use of probability distribution functions (PDFs) of Herschel column density maps of Orion B, Aquila, and Polaris, obtained with the Herschel Gould Belt survey (HGBS). We aim to understand which physical processes influenc…
Joint Analysis of Cluster Observations. II. Chandra/XMM-Newton X-Ray and Weak Lensing Scaling Relations for a Sample of 50 Rich Clusters of Galaxies
Hoekstra, Henk; Babul, Arif; Mahdavi, Andisheh +3 more
We present a study of multiwavelength X-ray and weak lensing scaling relations for a sample of 50 clusters of galaxies. Our analysis combines Chandra and XMM-Newton data using an energy-dependent cross-calibration. After considering a number of scaling relations, we find that gas mass is the most robust estimator of weak lensing mass, yielding 15%…
The FMOS-COSMOS Survey of Star-forming Galaxies at z ~ 1.6. I. Hα-based Star Formation Rates and Dust Extinction
Daddi, E.; Rodighiero, G.; Sanders, D. B. +26 more
We present the first results from a near-IR spectroscopic survey of the COSMOS field, using the Fiber Multi-Object Spectrograph on the Subaru telescope, designed to characterize the star-forming galaxy population at 1.4 < z < 1.7. The high-resolution mode is implemented to detect Hα in emission between 1.6-1.8 µm with f Hα &…
The Formation of IRIS Diagnostics. II. The Formation of the Mg II h&k Lines in the Solar Atmosphere
De Pontieu, B.; Leenaarts, J.; Carlsson, M. +2 more
NASA's Interface Region Imaging Spectrograph (IRIS) small explorer mission will study how the solar atmosphere is energized. IRIS contains an imaging spectrograph that covers the Mg II h&k lines as well as a slit-jaw imager centered at Mg II k. Understanding the observations requires forward modeling of Mg II h&k line formation from three-…
HST/WFC3 Confirmation of the Inside-out Growth of Massive Galaxies at 0 < z < 2 and Identification of Their Star-forming Progenitors at z ~ 3
van Dokkum, Pieter G.; Franx, Marijn; Muzzin, Adam +6 more
We study the structural evolution of massive galaxies by linking progenitors and descendants at a constant cumulative number density of n c = 1.4 × 10-4 Mpc-3 to z ~ 3. Structural parameters were measured by fitting Sérsic profiles to high-resolution CANDELS HST WFC3 J 125 and H 160 imaging in…
Explaining the [C II]157.7 µm Deficit in Luminous Infrared Galaxies—First Results from a Herschel/PACS Study of the GOALS Sample
Sturm, E.; Veilleux, S.; Sanders, D. B. +26 more
We present the first results of a survey of the [C II]157.7 µm emission line in 241 luminous infrared galaxies (LIRGs) comprising the Great Observatories All-sky LIRG Survey (GOALS) sample, obtained with the PACS instrument on board the Herschel Space Observatory. The [C II] luminosities, L [C II], of the LIRGs in GOALS range from…
The Ultraviolet Radiation Environment around M dwarf Exoplanet Host Stars
Roberge, Aki; Désert, Jean-Michel; France, Kevin +8 more
The spectral and temporal behavior of exoplanet host stars is a critical input to models of the chemistry and evolution of planetary atmospheres. Ultraviolet photons influence the atmospheric temperature profiles and production of potential biomarkers on Earth-like planets around these stars. At present, little observational or theoretical basis e…