Search Publications
Weak-lensing Mass Measurements of Substructures in Coma Cluster with Subaru/Suprime-cam
Okabe, N.; Futamase, T.; Okura, Y.
We obtain the projected mass distributions for two Subaru/Suprime-Cam fields in the southwest region (r <~ 60') of the Coma Cluster (z = 0.0236) by weak-lensing analysis and we detect eight subclump candidates. We quantify the contribution of background large-scale structure (LSS) on the projected mass distributions using Sloan Digital Sky Surv…
Wave-particle interactions in the equatorial source region of whistler-mode emissions
Gurnett, D. A.; Pickett, J. S.; Santolík, O. +8 more
Wave-particle interactions can play a key role in the process of transfer of energy between different electron populations in the outer Van Allen radiation belt. We present a case study of wave-particle interactions in the equatorial source region of whistler-mode emissions. We select measurements of the Cluster spacecraft when these emissions are…
The dust morphology of the elliptical Galaxy M 86 with SPIRE
Elbaz, D.; Bock, J. J.; Clements, D. L. +58 more
We present Herschel-SPIRE observations at 250-500 µm of the giant elliptical galaxy M 86 and examine the distribution of the resolved cold dust emission and its relation with other galactic tracers. The SPIRE images reveal three dust components: emission from the central region; a dust lane extending north-south; and a bright emission featur…
On the Relative Constancy of the Solar Wind Mass Flux at 1 AU
Wang, Y. -M.
Employing solar wind measurements from the Advanced Composition Explorer and Ulysses, photospheric magnetic data, and conservation laws along open field lines, we confirm that the energy and mass flux densities at the Sun increase roughly linearly with the footpoint field strength, B 0. This empirical result has a number of important ph…
Imaging Redshift Estimates for BL Lacertae Objects
Meisner, Aaron M.; Romani, Roger W.
We have obtained high dynamic range, good natural seeing i' images of BL Lacertae objects (BL Lacs) to search for the active galactic nucleus host and thus constrain the source redshift. These objects are drawn from a sample of bright flat-spectrum radio sources that are either known (via recent Fermi Large Area Telescope observations) gamma-ray e…
Search for Gamma-ray Emission from Magnetars with the Fermi Large Area Telescope
Ozaki, M.; Troja, E.; Caraveo, P. A. +136 more
We report on the search for 0.1-10 GeV emission from magnetars in 17 months of Fermi Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently known magnetars is found. The most stringent upper limits to date on their persistent emission in the Fermi energy range are estimated between ~10
Sinuous gullies on Mars: Frequency, distribution, and implications for flow properties
Mangold, N.; Ansan, V.; Mangeney, A. +4 more
Recent gullies on Mars are suspected to be the result of liquid-water-bearing flows. A formation from wet flows has been challenged by studies invoking granular (dry) flows. Our study focuses on the sinuous shapes observed for some of the recent Martian gullies. Sinuous gullies are found in locations and slopes (of 10°-15°) similar to straight gul…
Interstellar TiII in the Milky Way and Magellanic Clouds
Welty, Daniel E.; Crowther, Paul A.
We discuss several sets of TiII absorption-line data, which probe a variety of interstellar environments in our Galaxy and in the Magellanic Clouds. Comparisons of high-resolution [full width at half-maximum (FWHM) ~ 1.3-1.5kms-1] TiII spectra of Galactic targets with corresponding high-resolution spectra of NaI, KI and CaII reveal both…
Turbulence, complexity, and solar flares
Gallagher, Peter T.; McAteer, R. T. James; Conlon, Paul A.
The issue of predicting solar flares is one of the most fundamental in physics, addressing issues of plasma physics, high-energy physics, and modelling of complex systems. It also poses societal consequences, with our ever-increasing need for accurate space weather forecasts. Solar flares arise naturally as a competition between an input (flux eme…
X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1
Done, C.; Roberts, T. P.; Mineshige, S. +1 more
We use XMM-Newton and Swift data to study a spectral variability in the ultraluminous X-ray source (ULX), Holmberg IX X-1. The source luminosity varies by a factor of 3-4, giving rise to corresponding spectral changes which are significant, but subtle, and not well tracked by a simple hardness ratio. Instead, we co-add the Swift data in intensity …