H.E.S.S. Observations of the Prompt and Afterglow Phases of GRB 060602BWe report on the first completely simultaneous observation of a gamma-ray burst (GRB) using an array of Imaging Atmospheric Cherenkov Telescopes which is sensitive to photons in the very-high-energy…HESS Collaboration, F. Aharonian·Sep 13, 2008SaveLearn
A simple toy model of the advective-acoustic instability. II. Numerical simulationsThe physical processes involved in the advective-acoustic instability are investigated with 2D numerical simulations. Simple toy models, developped in a companion paper, are used to describe the…Jun'ichi Sato, Thierry Foglizzo, Sebastien Fromang·Sep 12, 2008SaveLearn
A simple toy model of the advective-acoustic instability I. Perturbative approachSome general properties of the advective-acoustic instability are described and understood using a toy model which is simple enough to allow for analytical estimates of the eigenfrequencies. The…T. Foglizzo·Sep 12, 2008SaveLearn
Turbulent formation of protogalaxies at the end of the plasma epoch: theory and observationsThe standard model of gravitational structure formation is based on the Jeans 1902 acoustic theory, neglecting nonlinear instabilities controlled by viscosity, turbulence and diffusion. Because the…R. E. Schild, C. H. Gibson·Sep 12, 2008SaveLearn
Dark Matter signals from Draco and Willman 1: Prospects for MAGIC II and CTAThe next generation of ground-based Imaging Air Cherenkov Telescopes (IACTs) will play an important role in indirect dark matter searches. In this article, we consider two particularly promising…Torsten Bringmann, Michele Doro, Mattia Fornasa·Sep 12, 2008SaveLearn
A Scalable Correlator Architecture Based on Modular FPGA Hardware, Reuseable Gateware, and Data PacketizationA new generation of radio telescopes is achieving unprecedented levels of sensitivity and resolution, as well as increased agility and field-of-view, by employing high-performance digital signal…Aaron Parsons, Donald Backer, Henry Chen et al.·Sep 12, 2008SaveLearn
Evolution of proto-galaxy-clusters to their present form: theory and observationsFrom hydro-gravitational-dynamics theory HGD, gravitational structure formation begins 30,000 years after the turbulent big bang by fragmentation into super-cluster-voids and super-clusters.…C. H. Gibson, R. E. Schild·Sep 12, 2008SaveLearn
Absorption features in the spectra of X-ray bursting neutron starsThe discovery of photospheric absorption lines in XMM-Newton spectra of the X-ray bursting neutron star in EXO0748-676 by Cottam and collaborators allows us to constrain the neutron star mass-radius…Thomas Rauch, Valery Suleimanov, Klaus Werner·Sep 12, 2008SaveLearn
Kozai cycles, tidal friction and the dynamical evolution of binary minor planetsIn recent years many binary minor planets (BMPs) have been discovered in the Solar system. Many models have been suggested for their formation, but these encounter difficulties explaining their…Hagai B. Perets, Smadar Naoz·Sep 12, 2008SaveLearn
The Galactic potential and the asymmetric distribution of hypervelocity starsIn recent years several hypervelocity stars (HVSs) have been observed in the halo of our Galaxy. Such HVSs have possibly been ejected from the Galactic center and then propagated in the Galactic…Hagai B. Perets, Xufen Wu, HongSheng Zhao et al.·Sep 12, 2008SaveLearn
Fossil Groups in the Millennium Simulation. Evolution of the Brightest GalaxiesWe create a catalogue of simulated fossil groups and study their properties, in particular the merging histories of their first-ranked galaxies. We compare the simulated fossil group properties with…Eugenia Diaz-Gimenez, Hernan Muriel, Claudia Mendes de Oliveira·Sep 12, 2008SaveLearn
Absolute properties of the spotted eclipsing binary star CV BootisWe present new V-band differential brightness measurements as well as new radial-velocity measurements of the detached, circular, 0.84-day period, double-lined eclipsing binary system CV Boo. These…Guillermo Torres, Luiz Paulo R. Vaz, Claud H. Sandberg Lacy·Sep 12, 2008SaveLearn
The transverse proximity effect in the z ~ 2 Lyman-alpha forest suggests QSO episodic lifetimes of ~1 MyrWe look for signs of the H~I transverse proximity effect in the spectra of 130 QSO pairs, most with transverse separations in the plane of the sky of 0.1 -- 3 Mpc at z ~ 2.2. We expected to see a…David Kirkman, David Tytler·Sep 12, 2008SaveLearn
The LkHa 101 ClusterIn the infrared, the heavily reddened LkHα 101 is one of the brightest young stars in the sky. Situated just north of the Taurus-Auriga complex in the L1482 dark cloud, it appears to be an early…Sean M. Andrews, Scott J. Wolk·Sep 12, 2008SaveLearn
2XMM J100451.6+411627: A cool core cluster at z=0.82- Aims: Gas cooling in the centre of massive galaxy clusters is believed to feed the most powerful active galactic nuclei in the Universe. How often clusters at high redshift show such cool cores has…Matthias Hoeft, Georg Lamer, Jan Kohnert et al.·Sep 12, 2008SaveLearn
Gravitational vacuum energy in our recently accelerating universeWe review current observations of the homogeneous cosmological expansion which, because they measure only kinematic variables, cannot determine the dynamics driving the recent accelerated expansion.…Sidney Bludman·Sep 12, 2008SaveLearn
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bandsThe BL Lac object S5 0716+71 was observed in a global multi-frequency campaign to search for rapid and correlated flux density variability and signatures of an inverse-Compton (IC) catastrophe during…L. Fuhrmann, T. P. Krichbaum, A. Witzel et al.·Sep 12, 2008SaveLearn
Recent results from the Pierre Auger ObservatoryThe main results from the Auger Observatory are described. A steepening of the spectrum is observed at the highest energies, supporting the expectation that above 4× 1019 eV the cosmic ray…Esteban Roulet·Sep 12, 2008SaveLearn
ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic CloudsThe Large and Small Magellanic Clouds are priviledged environments to perform tests of theoretical predictions at low metallicity on rotational velocities and stellar evolution. According to…Christophe Martayan, Jean Zorec, Yves Fremat·Sep 12, 2008SaveLearn
Variability of B and Be stars in the LMC/SMC: binaries and pulsationsTo study the variability of the 523 B and Be stars observed in the Magellanic clouds with the VLT-FLAMES, we cross-matched the stars of our sample with the photometric database MACHO, which provides…Christophe Martayan, Pascual Diago, Juan Gutiérrez-Soto et al.·Sep 12, 2008SaveLearn
The WFI Halpha spectroscopic survey of the Magellanic Clouds: Be stars in SMC open clustersAt low metallicity, B-type stars show lower loss of mass and, therefore, angular momentum so that it is expected that there are more Be stars in the Magellanic Clouds than in the Milky Way. However,…Christophe Martayan, Dietrich Baade, Juan Fabregat·Sep 12, 2008SaveLearn
Optical variability of the ultracool dwarf TVLM 513-46546: evidence for inhomogeneous dust cloudsWe present multi-colour photometry of the M8.5V ultracool dwarf "pulsar" TVLM 513-46546 (hereafter TVLM 513) obtained with the triple-beam photometer ULTRACAM. Data were obtained…S. P. Littlefair, V. S. Dhillon, T. R. Marsh et al.·Sep 12, 2008SaveLearn
The two INTEGRAL X-ray transients IGR J17091--3624 and IGR J17098--3628: a multi-wavelength long term campaignIGR J17091-3624 and IGR J17098-3628 are two X-ray transients discovered by INTEGRAL and classified as possible black hole candidates (BHCs). We present here the results obtained from the analysis of…F. Capitanio, M. Giroletti, M. Molina et al.·Sep 12, 2008SaveLearn
Optical spectroscopy of X-ray sources in the Taurus molecular cloud: discovery of ten new pre-main sequence starsWe have analyzed optical spectra of 25 X-ray sources identified as potential new members of the Taurus molecular cloud (TMC), in order to confirm their membership in this SFR. Fifty-seven candidates…L. Scelsi, G. Sacco, L. Affer et al.·Sep 12, 2008SaveLearn
On the X-ray feature associated with the Guitar NebulaContext: A mysterious X-ray nebula, showing a remarkably linear geometry, was recently discovered close to the Guitar Nebula, the bow-shock nebula associated with B2224+65, which is the fastest…Rino Bandiera·Sep 12, 2008SaveLearn