Search Publications
Neutral Interstellar Helium Parameters Based on IBEX-Lo Observations and Test Particle Calculations
Bochsler, P.; McComas, D. J.; Fuselier, S. A. +10 more
Because of its high ionization potential and weak interaction with hydrogen, neutral interstellar helium (NISHe) is almost unaffected at the heliospheric interface with the interstellar medium and freely enters the solar system. This second most abundant species provides some of the best information on the characteristics of the interstellar gas i…
Spectral Energy Distributions of Local Luminous and Ultraluminous Infrared Galaxies
Sanders, D. B.; Frayer, D. T.; Kartaltepe, J. S. +19 more
Luminous (LIRGs; log (L IR/L ⊙) = 11.00-11.99) and ultraluminous infrared galaxies (ULIRGs; log (L IR/L ⊙) = 12.00-12.99) are the most extreme star-forming galaxies in the universe. The local (U)LIRGs provide a unique opportunity to study their multi-wavelength properties in detail for comparison with th…
The ACS Fornax Cluster Survey. VI. The Nuclei of Early-type Galaxies in the Fornax Cluster
Jordán, Andrés; Côté, Patrick; Peng, Eric W. +5 more
The Advanced Camera for Surveys (ACS) Fornax Cluster Survey is a Hubble Space Telescope program to image 43 early-type galaxies in the Fornax cluster, using the F475W and F850LP bandpasses of the ACS. We employ both one-dimensional and two-dimensional techniques to characterize the properties of the stellar nuclei in these galaxies, defined as the…
New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars
Beers, Timothy C.; Roederer, Ian U.; Frebel, Anna +7 more
Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, can only be detected in the near-ultraviolet. We report the results of an observing campaign using the Space Telescope Imaging Spectrograph on board the Hubble Space Teles…
The Fermi GBM Gamma-Ray Burst Catalog: The First Two Years
Goldstein, Adam; Preece, Robert D.; Kouveliotou, Chryssa +26 more
The Fermi Gamma-ray Burst Monitor (GBM) is designed to enhance the scientific return from Fermi in studying gamma-ray bursts (GRBs). In its first two years of operation GBM triggered on 491 GRBs. We summarize the criteria used for triggering and quantify the general characteristics of the triggered GRBs, including their locations, durations, peak …
Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-dimensional Fast Fourier Transform Decomposition
Davis, Benjamin L.; Kennefick, Daniel; Kennefick, Julia +5 more
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes of pitch angle of spiral galaxies have been almost exclusively qualitative. We have developed a methodology, utilizing two-dimensional fast Fourier …
The COS-Halos Survey: Keck LRIS and Magellan MagE Optical Spectroscopy
Tripp, Todd M.; Prochaska, J. Xavier; Tumlinson, Jason +4 more
We present high signal-to-noise optical spectra for 67 low-redshift (0.1 < z < 0.4) galaxies that lie within close projected distances (5 kpc < ρ < 150 kpc) of 38 background UV-bright QSOs. The Keck LRIS and Magellan MagE data presented here are part of a survey that aims to construct a statistically sampled map of the physical state a…
The Taiwan ECDFS Near-Infrared Survey: Ultra-deep J and KS Imaging in the Extended Chandra Deep Field-South
Yan, Haojing; Ho, Paul T. P.; Hsieh, Bau-Ching +4 more
We present ultra-deep J and KS imaging observations covering a 30' × 30' area of the Extended Chandra Deep Field-South (ECDFS) carried out by our Taiwan ECDFS Near-Infrared Survey (TENIS). The median 5σ limiting magnitudes for all detected objects in the ECDFS reach 24.5 and 23.9 mag (AB) for J and KS , respectively. In the i…
Resolved Near-infrared Stellar Populations in Nearby Galaxies
de Jong, Roelof S.; Williams, Benjamin F.; Boyer, Martha L. +10 more
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (lsim 4 Mpc), based on images in the F110W and F160W filters taken with the Wide-Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The CMDs are measured in regions spanning a wide range of star formati…
Swift Follow-up Observations of Candidate Gravitational-wave Transient Events
Liu, Y.; Lee, H. M.; Foley, S. +815 more
We present the first multi-wavelength follow-up observations of two candidate gravitational-wave (GW) transient events recorded by LIGO and Virgo in their 2009-2010 science run. The events were selected with low latency by the network of GW detectors (within less than 10 minutes) and their candidate sky locations were observed by the Swift observa…