Search Publications
The afterglow of GRB 050709 and the nature of the short-hard γ-ray bursts
Cenko, S. B.; Peterson, B. A.; Price, P. A. +33 more
The final chapter in the long-standing mystery of the γ-ray bursts (GRBs) centres on the origin of the short-hard class of bursts, which are suspected on theoretical grounds to result from the coalescence of neutron-star or black-hole binary systems. Numerous searches for the afterglows of short-hard bursts have been made, galvanized by the revolu…
Measurement of the Electric Fluctuation Spectrum of Magnetohydrodynamic Turbulence
Bale, S. D.; Horbury, T. S.; Reme, H. +2 more
Magnetohydrodynamic (MHD) turbulence in the solar wind is observed to show the spectral behavior of classical Kolmogorov fluid turbulence over an inertial subrange and departures from this at short wavelengths, where energy should be dissipated. Here we present the first measurements of the electric field fluctuation spectrum over the inertial and…
The Solar Wind as a Turbulence Laboratory
Bruno, Roberto; Carbone, Vincenzo
In this review we will focus on a topic of fundamental importance for both plasma physics and astrophysics, namely the occurrence of large-amplitude low-frequency fluctuations of the fields that describe the plasma state. This subject will be treated within the context of the expanding solar wind and the most meaningful advances in this research f…
Toward an Understanding of the Rapid Decline of the Cosmic Star Formation Rate
Papovich, Casey; Pérez-González, Pablo G.; Bell, Eric F. +11 more
We present a first analysis of deep 24 µm observations with the Spitzer Space Telescope of a sample of nearly 1500 galaxies in a thin redshift slice, 0.65<=z<0.75. We combine the infrared data with redshifts, rest-frame luminosities, and colors from COMBO-17 and with morphologies from Hubble Space Telescope images collected by the Gala…
The Gemini Deep Deep Survey. VII. The Redshift Evolution of the Mass-Metallicity Relation
Juneau, S.; Glazebrook, K.; Abraham, R. G. +10 more
We have investigated the mass-metallicity (M-Z) relation using galaxies at 0.4<z<1.0 from the Gemini Deep Deep Survey (GDDS) and Canada-France Redshift Survey (CFRS). Deep K- and z'-band photometry allowed us to measure stellar masses for 69 galaxies. From a subsample of 56 galaxies, for which metallicity of the interstellar mediu…
Rain, winds and haze during the Huygens probe's descent to Titan's surface
Keller, H. U.; Küppers, M.; Thomas, N. +37 more
The irreversible conversion of methane into higher hydrocarbons in Titan's stratosphere implies a surface or subsurface methane reservoir. Recent measurements from the cameras aboard the Cassini orbiter fail to see a global reservoir, but the methane and smog in Titan's atmosphere impedes the search for hydrocarbons on the surface. Here we report …
Metallicities on the Double Main Sequence of ω Centauri Imply Large Helium Enhancement
Anderson, Jay; Bedin, Luigi R.; Recio-Blanco, Alejandra +9 more
Having shown in a recent paper that the main sequence of ω Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is less metal-poor. We have carefully combined VLT's GIRAFFE spectra of 17 stars on each side of the split into a single spectrum for each branch, with adequate signal-to-nois…
The XMM-Newton view of PG quasars. I. X-ray continuum and absorption
Guainazzi, M.; Schartel, N.; Rodríguez-Pascual, P. M. +3 more
We present results of a systematic analysis of the XMM-Newton spectra of 40 quasars (QSOs) (z≤1.72) from the Palomar-Green (PG) Bright Quasar Survey sample (MB<-23). The sample includes 35 radio-quiet quasars (RQQs) and 5 radio-loud quasars (RLQs). The analysis of the spectra above 2 keV reveals that the hard X-ray continuum emission…
Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters
Luri, X.; Jorissen, A.; Turon, C. +4 more
The availability of the Hipparcos Catalogue has triggered many kinematic and dynamical studies of the solar neighbourhood. Nevertheless, those studies generally lacked the third component of the space velocities, i.e., the radial velocities. This work presents the kinematic analysis of 5952 K and 739 M giants in the solar neighbourhood which inclu…
Sulfates in the North Polar Region of Mars Detected by OMEGA/Mars Express
Bibring, Jean-Pierre; Langevin, Yves; Gondet, Brigitte +1 more
The Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) imaging spectrometer observed the northern circumpolar regions of Mars at a resolution of a few kilometers. An extended region at 240°E, 85°N, with an area of 60 kilometers by 200 kilometers, exhibits absorptions at wavelengths of 1.45, 1.75, 1.94, 2.22, 2.26, and 2.48 …