Limits on Low-Mass WIMP Dark Matter with an Ultra-Low-Energy Germanium Detector at 220 eV ThresholdAn energy threshold of (22010) eV was achieved at an efficiency of 50% with a four-channel ultra-low-energy germanium detector each with an active mass of 5 gwimppaper. This provides a…Shin-Ted Lin, H. T. Wong·Oct 20, 2008SaveLearn
Initial Hubble Diagram Results from the Nearby Supernova FactoryThe use of Type Ia supernovae as distance indicators led to the discovery of the accelerating expansion of the universe a decade ago. Now that large second generation surveys have significantly…S. Bailey, G. Aldering, P. Antilogus et al.·Oct 20, 2008SaveLearn
A New Dynamical Model for the Black Hole Binary LMC X-1We present a dynamical model of the high mass X-ray binary LMC X-1 based on high-resolution optical spectroscopy and extensive optical and near-infrared photometry. From our new optical data we find…Jerome A. Orosz, Danny Steeghs, Jeffrey E. McClintock et al.·Oct 20, 2008SaveLearn
A shift in Jupiter's equatorial haze distribution imaged with the Multi-Conjugate Adaptive Optics Demonstrator at the VLTJupiter was imaged during the Science Demonstration of the MCAO Demonstrator (MAD) at the European Southern Observatory's UT3 Very Large Telescope unit. Io and Europa were used as natural guide…Michael H. Wong, Franck Marchis, Enrico Marchetti et al.·Oct 20, 2008SaveLearn
Dust in the inner regions of debris disks around A starsWe present infrared interferometric observations of the inner regions of two A-star debris disks, beta Leo and zeta Lep, using the FLUOR instrument at the CHARA interferometer on both short (30 m)…R. L. Akeson, D. R. Ciardi, R. Millan-Gabet et al.·Oct 20, 2008SaveLearn
The kinematic signature of damped Lyman alpha systems: Using the D-index to screen for high column density HI absorbersUsing a sample of 21 damped Lyman alpha systems (DLAs) and 35 sub-DLAs, we evaluate the D-index = EW / Delta v x 1000 from high resolution spectra of the MgII lambda 2796 profile. This sample…Sara L. Ellison, Michael T. Murphy, Miroslava Dessauges-Zavadsky·Oct 20, 2008SaveLearn
Empirical Models of Pressure and Density in Saturn's Interior: Implications for the Helium Concentration, its Depth Dependence, and Saturn's Precession RateWe present 'empirical' models (pressure vs. density) of Saturn's interior constrained by the gravitational coefficients J2, J4, and J6 for different assumed rotation rates of the…Ravit Helled, Gerald Schubert, John D. Anderson·Oct 20, 2008SaveLearn
Simbol-X: A Formation Flight Mission with an Unprecedented Imaging Capability in the 0.5-80 Kev Energy BandThe discovery of X-ray emission from cosmic sources in the 1960s has opened a new powerful observing window on the Universe. In fact, the exploration of the X-ray sky during the 70s-90s has…Gianpiero Tagliaferri, Philippe Ferrando, Jean-Michel Le Duigou et al.·Oct 20, 2008SaveLearn
Multiwavelength Signatures of Cosmic Ray Acceleration by Young Supernova RemnantsAn overview is given of multiwavelength observations of young supernova remnants, with a focus on the observational signatures of efficient cosmic ray acceleration. Some of the effects that may be…Jacco Vink·Oct 20, 2008SaveLearn
Measurement of the dark matter velocity anisotropy profile in galaxy clustersDark matter particles form halos that contribute the major part of the mass of galaxy clusters. The formation of these cosmological structures have been investigated both observationally and in…Ole Host·Oct 20, 2008SaveLearn
On the Origin of the 511 keV Emission in the Galactic CentreDiffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution maps of this…Reba M. Bandyopadhyay, Joseph Silk, James E. Taylor et al.·Oct 20, 2008SaveLearn
Timescales for Low-Mass Star Formation in Extragalactic Environments: Implications for the Stellar IMFWe investigate the physical and chemical conditions necessary for low-mass star formation in extragalactic environments by calculating various characteristic timescales associated with star formation…Manda Banerji, Serena Viti, David A. Williams et al.·Oct 20, 2008SaveLearn
Alas, the dark matter structures were not that trivialThe radial density profile of dark matter structures has been observed to have an almost universal behaviour in numerical simulations, however, the physical reason for this behaviour remains unclear.…Kasper B. Schmidt, Steen H. Hansen, Andrea V. Maccio'·Oct 20, 2008SaveLearn
Ongoing and co-evolving star formation in zCOSMOS galaxies hosting Active Galactic NucleiWe present a study of the host galaxies of AGN selected from the zCOSMOS survey to establish if accretion onto supermassive black holes and star formation are explicitly linked up to z~1. We identify…J. D. Silverman, F. Lamareille, C. Maier et al.·Oct 20, 2008SaveLearn
Old-Population Hypervelocity Stars from the Galactic Center: Limits from the SDSSWe present limits on the ejection of old-population HVS from a sample of over 290,000 stars selected from the SDSS. We derive the speed at the solar circle from the measured positions and radial…Juna A. Kollmeier, Andrew Gould, Gillian Knapp et al.·Oct 20, 2008SaveLearn
Chemical Inhomogeneities in the Milky Way Stellar HaloWe have compiled a sample of 699 stars from the recent literature with detailed chemical abundance information (spanning -4.2 < [Fe/H] < +0.3), and we compute their space velocities and Galactic…Ian U. Roederer·Oct 20, 2008SaveLearn
How Do Galaxies Form?It is currently believed that galaxies were assembled via chaotic hierarchical mergers between massive cold dark matter halos, in which baryonic star forming matter was embedded. One would therefore…Sidney van den Bergh·Oct 20, 2008SaveLearn
GRB observations with HESSH.E.S.S. (High Energy Stereoscopic System), which is designed to detect TeV gamma-rays, is a system of four Imaging Atmospheric Cherenkov Telescopes situated in Namibia. The system has been shown to…P. H. Tam, S. J. Wagner, G. Pühlhofer et al.·Oct 20, 2008SaveLearn
The Via Lactea INCITE Simulation: Galactic Dark Matter Substructure at High ResolutionIt is a clear unique prediction of the cold dark matter paradigm of cosmological structure formation that galaxies form hierarchically and are embedded in massive, extended dark halos teeming with…M. Kuhlen, J. Diemand, P. Madau et al.·Oct 20, 2008SaveLearn
Wave propagation and shock formation in different magnetic structuresVelocity oscillations "measured" simultaneously at the photosphere and the chromosphere -from time series of spectropolarimetric data in the 10830 A region- of different solar magnetic…Rebecca Centeno, Manuel Collados, Javier Trujillo Bueno·Oct 20, 2008SaveLearn
Are low-degree p mode frequencies predictable from one cycle to the next?The Birmingham Solar-Oscillations Network (BiSON) has been collecting data for over 30yrs and so observations span nearly three 11yr solar activity cycles. This allows us to address important…A. M. Broomhall, W. J. Chaplin, Y. Elsworth et al.·Oct 20, 2008SaveLearn
Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass Objects in the Orion Nebula ClusterWe present near-infrared long slit and multi-slit spectra of low mass brown dwarf candidates in the Orion Nebula Cluster. The long slit data were observed in the H- & K-bands using NIRI on the Gemini…D. J. Weights, P. W. Lucas, P. F. Roche et al.·Oct 20, 2008SaveLearn
A Multiwavelength View of Star Formation in Interacting Galaxies in the Pavo GroupWe combine Spitzer IRAC mid-infrared (MIR) and Chandra X-ray observations of the dominant galaxies NGC6872 and NGC6876 in the Pavo group with archival optical and HI data to study interaction-induced…M. Machacek, M. L. N. Ashby, C. Jones et al.·Oct 20, 2008SaveLearn
Dark energy and neutrino mass constraints from weak lensing, supernova, and relative galaxy agesWe use the current weak lensing data to constrain the equation of state of dark energy w and the total mass of massive neutrinos Σ mν. The constraint on w would be weak if only the current…Yan Gong, Tong-Jie Zhang, Tian Lan et al.·Oct 20, 2008SaveLearn
The Arecibo Legacy Fast ALFA Survey VII: A Neutral Hydrogen Cloud Complex in the Virgo ClusterWe present observations of an HI cloud complex most likely located in the Virgo galaxy cluster, first reported by Kent et al. (2007). The complex consists of five clouds, detected in the data set of…Brian R. Kent, Kristine Spekkens, Riccardo Giovanelli et al.·Oct 20, 2008SaveLearn