Search Publications
AEGIS: Enhancement of Dust-enshrouded Star Formation in Close Galaxy Pairs and Merging Galaxies up to z ~ 1
Weiner, Benjamin J.; Conselice, Christopher J.; Huang, J. -S. +13 more
Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems, including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS 24 µm fluxes of these systems reflect the current dusty star formation activity, and at a fixed stella…
A TRACE White Light and RHESSI Hard X-Ray Study of Flare Energetics
Fletcher, L.; Hannah, I. G.; Hudson, H. S. +1 more
In this paper we investigate the formation of the white-light (WL) continuum during solar flares and its relationship to energy deposition by electron beams inferred from hard X-ray emission. We analyze nine flares spanning GOES classifications from C4.8 to M9.1, seven of which show clear cospatial RHESSI hard X-ray and TRACE WL footpoints. We cha…
Exploring the properties of dark energy using type-Ia supernovae and other datasets
Starobinsky, Alexei A.; Alam, Ujjaini; Sahni, Varun
We reconstruct dark energy properties from two complementary supernova datasets—the newly released Gold + HST sample and SNLS. The results obtained are consistent with the standard ΛCDM model within 2σ error bars, although the Gold + HST data favour evolving dark energy slightly more than SNLS. Using complementary data from baryon acoustic oscilla…
GRB 060505: A Possible Short-Duration Gamma-Ray Burst in a Star-forming Region at a Redshift of 0.09
Sharon, K.; Cenko, S. B.; Price, P. A. +26 more
On 2006 May 5, a 4 s duration, low-energy, ~1049 erg, gamma-ray burst (GRB) was observed, spatially associated with a z=0.0894 galaxy. Here we report the discovery of the GRB optical afterglow and observations of its environment using Gemini South, the Hubble Space Telescope (HST), Chandra, Swift, and the Very Large Array. The optical a…
Non-thermal emission processes in massive binaries
De Becker, Michaël
In this paper, I present a general discussion of several astrophysical processes likely to play a role in the production of non-thermal emission in massive stars, with emphasis on massive binaries. Even though the discussion will start in the radio domain where the non-thermal emission was first detected, the census of physical processes involved …
RPC-IES: The Ion and Electron Sensor of the Rosetta Plasma Consortium
Winningham, J. D.; Young, D. T.; Goldstein, R. +5 more
The ion and electron sensor (IES) is part of the Rosetta Plasma Consortium (RPC). The IES consists of two electrostatic plasma analyzers, one each for ions and electrons, which share a common entrance aperture. Each analyzer covers an energy/charge range from 1 eV/e to 22 keV/e with a resolution of 4%. Electrostatic deflection is used at the entra…
Detection of [Ne II] Emission from Young Circumstellar Disks
Pascucci, I.; Carpenter, J. M.; Meyer, M. R. +9 more
We report the detection of [Ne II] emission at 12.81 µm in four out of the six optically thick dust disks observed as part of the FEPS Spitzer Legacy program. In addition, we detect a H I (7-6) emission line at 12.37 µm from the source RX J1852.3-3700. Detections of [Ne II] lines are favored by low mid-infrared excess emission. Both st…
Up to 1-hour forecasting of radiation hazards from solar energetic ion events with relativistic electrons
Posner, Arik
The sudden and prompt occurrence of solar energetic particle events poses a hazard to manned space activities and interferes with robotic space science missions. This study demonstrates the possibility of short-term forecasting of the appearance and intensity of solar ion events by means of relativistic, near-light speed electrons. A list of the m…
Global-scale surface spectral variations on Titan seen from Cassini/VIMS
Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien +7 more
We present global-scale maps of Titan from the Visual and Infrared Mapping Spectrometer (VIMS) instrument on Cassini. We map at 64 near-infrared wavelengths simultaneously, covering the atmospheric windows at 0.94, 1.08, 1.28, 1.6, 2.0, 2.8, and 5 µm with a typical resolution of 50 km/pixel or a typical total integration time of 1 s. Our map…
Are ``EIT Waves'' Fast-Mode MHD Waves?
DeForest, C. E.; Stenflo, J. O.; Wills-Davey, M. J.
We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: nondispersive single pulse manifestations, observed velocities below the local Alfvén speed, and different pulses which travel…