Search Publications
z ~ 4 Hα Emitters in the Great Observatories Origins Deep Survey: Tracing the Dominant Mode for Growth of Galaxies
Dickinson, Mark; Yan, Chi-Hung; Chary, Ranga-Ram +4 more
We present evidence for strong Hα emission in galaxies with spectroscopic redshifts in the range of 3.8 < z < 5.0 over the Great Observatories Origins Deep Survey fields. Among 74 galaxies detected in the Spitzer IRAC 3.6 and 4.5 µm bands, more than 70% of the galaxies show clear excess at 3.6 µm compared to the expected flux den…
The Hidden Mass and Large Spatial Extent of a Post-Starburst Galaxy Outflow
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +9 more
Outflowing winds of multiphase plasma have been proposed to regulate the buildup of galaxies, but key aspects of these outflows have not been probed with observations. By using ultraviolet absorption spectroscopy, we show that “warm-hot” plasma at 105.5 kelvin contains 10 to 150 times more mass than the cold gas in a post-starburst gala…
Swift X-Ray Observations of Classical Novae. II. The Super Soft Source Sample
Walter, Frederick M.; Drake, Jeremy J.; Woodward, Charles E. +9 more
The Swift gamma-ray burst satellite is an excellent facility for studying novae. Its rapid response time and sensitive X-ray detector provides an unparalleled opportunity to investigate the previously poorly sampled evolution of novae in the X-ray regime. This paper presents Swift observations of 52 Galactic/Magellanic Cloud novae. We included the…
Star Clusters in M31. II. Old Cluster Metallicities and Ages from Hectospec Data
Caldwell, Nelson; Harding, Paul; Rose, James A. +2 more
We present new high signal-to-noise spectroscopic data on the M31 globular cluster (GC) system, obtained with the Hectospec multifiber spectrograph on the 6.5 m MMT. More than 300 clusters have been observed at a resolution of 5 Å and with a median S/N of 75 per Å, providing velocities with a median uncertainty of 6 km s-1. The primary …
High-resolution solar spectral irradiance from extreme ultraviolet to far infrared
Fontenla, J. M.; Snow, M.; Woods, T. +2 more
This paper presents new extremely high-resolution solar spectral irradiance (SSI) calculations covering wavelengths from 0.12 nm to 100 micron obtained by the Solar Irradiance Physical Modeling (SRPM) system. Daily solar irradiance spectra were constructed for most of Solar Cycle 23 based on a set of physical models of the solar features and non-L…
The volcanic history of Mars: High-resolution crater-based studies of the calderas of 20 volcanoes
Hynek, Brian M.; Robbins, Stuart J.; di Achille, Gaetano
Determining absolute surface ages for bodies in the Solar System is, at present, only possible for Earth and Moon with radiometric dating for both bodies and biologic proxies such as fossils for Earth. Relative ages through cratering statistics are recognized as one of the most reliable proxies for relative ages, calibrated by lunar geologic mappi…
Ion Energization and Escape on Mars and Venus
Fedorov, A.; Lundin, R.; Dubinin, E. +4 more
Mars and Venus do not have a global magnetic field and as a result solar wind interacts directly with their ionospheres and upper atmospheres. Neutral atoms ionized by solar UV, charge exchange and electron impact, are extracted and scavenged by solar wind providing a significant loss of planetary volatiles. There are different channels and routes…
Planck early results. X. Statistical analysis of Sunyaev-Zeldovich scaling relations for X-ray galaxy clusters
Kneissl, R.; Dahle, H.; Miville-Deschênes, M. -A. +197 more
All-sky data from the Planck survey and the Meta-Catalogue of X-ray detected Clusters of galaxies (MCXC) are combined to investigate the relationship between the thermal Sunyaev-Zeldovich (SZ) signal and X-ray luminosity. The sample comprises ~1600 X-ray clusters with redshifts up to ~1 and spans a wide range in X-ray luminosity. The SZ signal is …
Anisotropy of Alfvénic turbulence in the solar wind and numerical simulations
Horbury, T. S.; Chen, C. H. K.; Mallet, A. +2 more
We investigate the anisotropy of Alfvénic turbulence in the inertial range of slow solar wind and in both driven and decaying reduced magnetohydrodynamic simulations. A direct comparison is made by measuring the anisotropic second-order structure functions in both data sets. In the solar wind, the perpendicular spectral index of the magnetic field…
The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey
Murphy, Eric; Gordon, Karl D.; Johnson, Benjamin D. +29 more
Using new far-infrared imaging from the Herschel Space Observatory with ancillary data from ultraviolet (UV) to submillimeter wavelengths, we estimate the total emission from dust and stars of 62 nearby galaxies in the KINGFISH survey in a way that is as empirical and model independent as possible. We collect and exploit these data in order to mea…