Search Publications
The Evolution of Mass-Size Relation for Lyman Break Galaxies from z = 1 to z = 7
Franx, Marijn; Illingworth, Garth D.; Bouwens, Rychard J. +6 more
For the first time, we study the evolution of the stellar mass-size relation for star-forming galaxies from z ~ 4 to z ~ 7 from Hubble-WFC3/IR camera observations of the HUDF and Early Release Science field. The sizes are measured by determining the best-fit model to galaxy images in the rest-frame 2100 Å with the stellar masses estimated from spe…
A Double Main Sequence in the Globular Cluster NGC 6397
Anderson, J.; Milone, A. P.; Marino, A. F. +5 more
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (1) a primordial population that has a composition simi…
[C II] 158 µm Luminosities and Star Formation Rate in Dusty Starbursts and Active Galactic Nuclei
Lebouteiller, V.; Engels, D.; Stacey, G. +8 more
Results are presented for [C II] 158 µm line fluxes observed with the Herschel PACS instrument in 112 sources with both starburst and active galactic nucleus (AGN) classifications, of which 102 sources have confident detections. Results are compared with mid-infrared spectra from the Spitzer Infrared Spectrometer and with L ir fro…
The UVJ Selection of Quiescent and Star-forming Galaxies: Separating Early- and Late-type Galaxies and Isolating Edge-on Spirals
Franx, Marijn; Kelson, Daniel D.; Illingworth, Garth D. +3 more
We utilize for the first time Hubble Space Telescope Advanced Camera for Surveys imaging to examine the structural properties of galaxies in the rest-frame U - V versus V - J diagram (i.e., the UVJ diagram) using a sample at 0.6 < z < 0.9 that reaches a low stellar mass limit (log M/M ⊙ >10.25). The use of the UVJ diagram as a …
On Spectral Breaks in the Power Spectra of Magnetic Fluctuations in Fast Solar Wind between 0.3 and 0.9 AU
Maksimovic, M.; Alexandrova, O.; Marsch, E. +1 more
We analyze the radial variation of the power spectra of the magnetic field from 0.3 to about 0.9 AU, using Helios 2 spacecraft measurements in the fast solar wind. The time resolution of the magnetic field data allows us to study the power spectra up to 2 Hz. Generally, the corresponding spectral break frequency fb and the Doppler-shift…
Re-evaluating WASP-12b: Strong Emission at 2.315 µm, Deeper Occultations, and an Isothermal Atmosphere
Barman, Travis; Crossfield, Ian J. M.; Kodama, Tadayuki +2 more
We revisit the atmospheric properties of the extremely hot Jupiter WASP-12b in light of several new developments. First, we present new narrowband (2.315 µm) secondary eclipse photometry, which exhibits a planet/star flux ratio of 0.45% ± 0.06%, corresponding to a brightness temperature of 3640 ± 230 K; second, recent Spitzer/Infrared Array …
Understanding SDO/AIA Observations of the 2010 June 13 EUV Wave Event: Direct Insight from a Global Thermodynamic MHD Simulation
Lugaz, Noé; Downs, Cooper; Roussev, Ilia I. +2 more
In this work, we present a comprehensive observation and modeling analysis of the 2010 June 13 extreme-ultraviolet (EUV) wave observed by the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO). Due to extreme advances in cadence, resolution, and bandpass coverage in the EUV regime, the AIA instrument offers an unprecede…
Inferences on the Distribution of Lyα Emission of z ~ 7 and z ~ 8 Galaxies
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +2 more
Spectroscopic confirmation of galaxies at z ~ 7 and above has been extremely difficult, owing to a drop in intensity of Lyα emission in comparison with samples at z ~ 6. This crucial finding could potentially signal the ending of cosmic reionization. However, it is based on small data sets, often incomplete and heterogeneous in nature. We introduc…
The Impact of Evolving Infrared Spectral Energy Distributions of Galaxies on Star Formation Rate Estimates
Berta, S.; Magnelli, B.; Nordon, R. +27 more
We combine Herschel-Photodetector Array Camera and Spectrometer (PACS) data from the PACS Evolutionary Probe (PEP) program with Spitzer 24 µm and 16 µm photometry and ultra deep Infrared Spectrograph (IRS) mid-infrared spectra to measure the mid- to far-infrared spectral energy distribution (SED) of 0.7 < z < 2.5 normal star-form…
The Molecular Gas Content of z = 3 Lyman Break Galaxies: Evidence of a Non-evolving Gas Fraction in Main-sequence Galaxies at z > 2
Aussel, H.; Daddi, E.; Elbaz, D. +10 more
We present observations of the CO[J = 3 → 2] emission toward two massive and infrared luminous Lyman break galaxies (LBGs) at z = 3.21 and z = 2.92, using the IRAM Plateau de Bure Interferometer, placing first constraints on the molecular gas masses (M gas) of non-lensed LBGs. Their overall properties are consistent with those of typica…