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The VLT-FLAMES Tarantula Survey. VII. A low velocity dispersion for the young massive cluster R136
van Loon, J. Th.; Crowther, P. A.; Bastian, N. +8 more
Detailed studies of resolved young massive star clusters are necessary to determine their dynamical state and evaluate the importance of gas expulsion and early cluster evolution. In an effort to gain insight into the dynamical state of the young massive cluster R136 and obtain the first measurement of its velocity dispersion, we analyse multi-epo…
Spectral Energy Distributions of Type 1 Active Galactic Nuclei in the COSMOS Survey. I. The XMM-COSMOS Sample
Liu, Y.; Aussel, H.; Le Floc'h, E. +39 more
The "Cosmic Evolution Survey" (COSMOS) enables the study of the spectral energy distributions (SEDs) of active galactic nuclei (AGNs) because of the deep coverage and rich sampling of frequencies from X-ray to radio. Here we present an SED catalog of 413 X-ray (XMM-Newton)-selected type 1 (emission line FWHM > 2000 km s-1) AGNs with …
Wide distribution and glacial origin of polar gypsum on Mars
Le Mouélic, S.; Spiga, A.; Le Deit, L. +3 more
The North Polar Cap of Mars is associated with different kinds of superficial sediments, including the Circumpolar Dune Field, interior dune fields and sedimentary veneers scattered over the ice cap. In order to resolve the mineralogical composition and the regional distribution of these sediments, we processed OMEGA and CRISM hyperspectral data w…
Atomic model of the type III secretion system needle
Baker, David; Loquet, Antoine; Sgourakis, Nikolaos G. +8 more
Pathogenic bacteria using a type III secretion system (T3SS) to manipulate host cells cause many different infections including Shigella dysentery, typhoid fever, enterohaemorrhagic colitis and bubonic plague. An essential part of the T3SS is a hollow needle-like protein filament through which effector proteins are injected into eukaryotic host ce…
Energetic particle injections to geostationary orbit: Relationship to flow bursts and magnetospheric state
Nakamura, R.; Sergeev, V. A.; Chernyaev, I. A. +5 more
To address the mechanism and factors controlling the injection of energetic particles to the geostationary orbit (GEO), we analyzed the appearance of injections at the GEO drift shell as observed by LANL spacecraft in the cases where the flow bursts and associated transient dipolarization were detected at the entry to the inner magnetosphere, in t…
Cluster and TC-1 observation of magnetic holes in the plasma sheet
Lucek, E.; Dunlop, M. W.; Carr, C. +10 more
Magnetic holes with relatively small scale sizes, detected by Cluster and TC-1 in the magnetotail plasma sheet, are studied in this paper. It is found that these magnetic holes are spatial structures and they are not magnetic depressions generated by the flapping movement of the magnetotail current sheet. Most of the magnetic holes (93%) were obse…
Recombining Plasma and Hard X-Ray Filament in the Mixed-Morphology Supernova Remnant W 44
Yamaguchi, Hiroya; Uchida, Hiroyuki; Fukui, Yasuo +6 more
We report on new features of the typical mixed-morphology supernova remnant W 44. In X-ray spectra obtained with Suzaku, radiative recombination continua of highly ionized atoms were detected for the first time. The spectra are well reproduced by a thermal plasma in a recombining phase. The best-fit parameters suggest that the electron temperature…
Weak Lensing Measurement of Galaxy Clusters in the CFHTLS-Wide Survey
Massey, Richard; Kneib, Jean-Paul; Rhodes, Jason +7 more
We present the first weak gravitational lensing analysis of the completed Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We study the 64 deg2 W1 field, the largest of the CFHTLS-Wide survey fields, and present the largest contiguous weak lensing convergence "mass map" yet made. 2.66 million galaxy shapes are measured, using the …
Coronal hole boundaries at small scales. IV. SOT view. Magnetic field properties of small-scale transient brightenings in coronal holes
Doyle, J. G.; Madjarska, M. S.; Huang, Z. +1 more
Context. We study the magnetic properties of small-scale transients in coronal holes and a few in the quiet Sun identified in X-ray observations and spectroscopic data in two previous papers.
Aims: We aim to investigate the role of small-scale transients in the evolution of the magnetic field in an equatorial coronal hole.
Methods: Two s…
The Slow Death (Or Rebirth?) of Extended Star Formation in z ~ 0.1 Green Valley Early-type Galaxies
Faber, S. M.; Salim, Samir; Rich, R. Michael +2 more
UV observations in the local universe have uncovered a population of early-type galaxies with UV flux consistent with low-level recent or ongoing star formation. Understanding the origin of such star formation remains an open issue. We present resolved UV-optical photometry of a sample of 19 Sloan Digital Sky Survey (SDSS) early-type galaxies at z…