A measurement of large-scale peculiar velocities of clusters of galaxies: technical detailsThis paper presents detailed analysis of large-scale peculiar motions derived from a sample of ~ 700 X-ray clusters and cosmic microwave background (CMB) data obtained with WMAP. We use the kinematic…A. Kashlinsky, F. Atrio-Barandela, D. Kocevski et al.·Sep 22, 2008SaveLearn
Compact groups from the Millennium Simulations: I. Their Nature and the completeness of the Hickson sampleWe identify compact groups of galaxies (CGs) within mock galaxy catalogues from the Millennium Simulation at z=0 with three semi-analytic models (SAMs) of galaxy formation. CGs are identified using…Eugenia Diaz-Gimenez, Gary Mamon·Sep 22, 2008SaveLearn
The Luminosity and Energy Dependence of Pulse Phase Lags in the Accretion-powered Millisecond Pulsar SAX J1808.4-3658Soft phase lags, in which X-ray pulses in lower energy bands arrive later than pulses in higher energy bands, have been observed in nearly all accretion-powered millisecond pulsars, but their origin…Jacob M. Hartman, Anna L. Watts, Deepto Chakrabarty·Sep 22, 2008SaveLearn
Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurementsRefined astrometry measurements allow us to detect large-scale deviations from isotropy through real-time observations of changes in the angular separation between sources at cosmic distances. This…Claudia Quercellini, Miguel Quartin, Luca Amendola·Sep 22, 2008SaveLearn
Water in the Near IR spectrum of Comet 8P/TuttleHigh resolution spectra of Comet 8P/Tuttle were obtained in the frequency range 3440.6-3462.6 cm-1 on 3 January 2008 UT using CGS4 with echelle grating on UKIRT. In addition to recording strong solar…R. J. Barber, S. Miller, N. Dello Russo et al.·Sep 22, 2008SaveLearn
A comparison of chemistry and dust cloud formation in ultracool dwarf model atmospheresThe atmospheres of substellar objects contain clouds of oxides, iron, silicates, and other refractory condensates. Water clouds are expected in the coolest objects. The opacity of these `dust'…Ch. Helling, A. Ackerman, F. Allard et al.·Sep 22, 2008SaveLearn
IGRJ16479-4514: the first eclipsing supergiant fast X-ray transient?Supergiant fast X-ray transients are a new class of high mass X-ray binaries recently discovered with INTEGRAL. Hours long outbursts from these sources have been observed on numerous occasions at…E. Bozzo, L. Stella, G. Israel et al.·Sep 22, 2008SaveLearn
Alleviation of Cosmic Age Problem In Interacting Dark Energy ModelWe investigate the cosmic age problem associated with the old high-z quasar APM 08279 + 5255 and the oldest globular cluster M 107, both being difficult to accommodate in ΛCDM model. By…Shuang Wang, Yang Zhang·Sep 22, 2008SaveLearn
Spectral hardness evolution characteristics of tracking Gamma-ray Burst pulsesEmploying a sample presented by Kaneko et al. (2006) and Kocevski et al. (2003), we select 42 individual tracking pulses (here we defined tracking as the cases in which the hardness follows the same…Z. Y. Peng, L. Ma, R. J. Lu et al.·Sep 22, 2008SaveLearn
Application of the Cubed-Sphere Grid to Tilted Black-Hole Accretion DisksIn recent work we presented the first results of global general relativistic magnetohydrodynamic (GRMHD) simulations of tilted (or misaligned) accretion disks around rotating black holes. The…P. Chris Fragile, Christopher C. Lindner, Peter Anninos et al.·Sep 22, 2008SaveLearn
Atomic Fluorescence and Prospects for Observing Magnetic Geometry Using Atomic Magnetic RealignmentYan and Lazarian have proposed a new technique through which the magnetic field geometry in the diffuse interstellar medium, or in circumstellar matter, could be determined from the linear…Kenneth Nordsieck·Sep 22, 2008SaveLearn
Radial structure, inflow & central mass of stationary radiative galaxy clustersWe analyse the radial structure of self-gravitating spheres consisting of multiple interpenetrating fluids, such as the X-ray emitting gas and the dark halo of a galaxy cluster. In these dipolytropic…Curtis J. Saxton, Kinwah Wu·Sep 22, 2008SaveLearn
Constraints on the Local Sources of Ultra High-Energy Cosmic RaysUltra high-energy cosmic rays (UHECRs) are believed to be protons accelerated in magnetized plasma outflows of extra-Galactic sources. The acceleration of protons to ~1020 eV requires a source…Eli Waxman, Abraham Loeb·Sep 22, 2008SaveLearn
The Magellanic Group and the Seven DwarfsThe Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. This group, dominated by the LMC, contained ~4% of the mass of the…Elena D'Onghia, George Lake·Sep 22, 2008SaveLearn
HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418We present the detection of deuterated molecular hydrogen (HD) in the remote Universe in a damped Lyman-alpha cloud at zabs=2.418 toward the quasar SDSS J143912.04+111740.5. This is a unique system…P. Noterdaeme, P. Petitjean, C. Ledoux et al.·Sep 22, 2008SaveLearn
Self-consistent physical parameters for MC clusters from CMD modelling: application to SMC clusters observed with the SOAR telescopeThe Magellanic Clouds (MCs) present a rich system of stellar clusters that can be used to probe the dynamical and chemical evolution of these neighboring and interacting irregular galaxies. In…Bruno M. S. Dias, Leandro O. Kerber, Basílio X. Santiago et al.·Sep 22, 2008SaveLearn
Progenitor mass of the type IIP supernova 2005csThe progenitor mass of type IIP supernova can be determined from either hydrodynamic modeling of the event or pre-explosion observations. To compare these approaches, we determine parameters of the…V. P. Utrobin, N. N. Chugai·Sep 22, 2008SaveLearn
The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostarsDeuterated ions are abundant in cold (T=10 K), dense (n=105 cm-3) regions, in which CO is frozen out onto dust grains. In such environments, the deuterium fractionation of such ions can exceed the…M. Emprechtinger, P. Caselli, N. H. Volgenau et al.·Sep 22, 2008SaveLearn
Plasmoids in Reconnecting Current Sheets: Solar and Terrestrial Contexts ComparedMagnetic reconnection plays a crucial role in violent energy conversion occurring in the environments of high electrical conductivity, such as the solar atmosphere, magnetosphere, and fusion devices.…J. Lin, S. R. Cranmer, C. J. Farrugia·Sep 22, 2008SaveLearn
The Growth & Migration of Jovian Planets in Evolving Protostellar Disks with Dead ZonesThe growth of Jovian mass planets during migration in their protoplanetary disks is one of the most important problems that needs to be solved in light of observations of the exosolar planets.…Soko Matsumura, Ralph E. Pudritz, Edward W. Thommes·Sep 22, 2008SaveLearn
Abundances of Planetary Nebulae NGC3242 and NGC6369The spectra of the planetary nebulae NGC3242 and NGC6369 are reanalysed using spectral measurements made in the mid-infrared with the Spitzer Space Telescope and the Infrared Space Observatory (ISO).…S. R. Pottasch, J. Bernard-Salas·Sep 22, 2008SaveLearn
2MASS wide field extinction maps: II. The Ophiuchus and the Lupus cloud complexeWe present an extinction map of a ~1,700 deg sq region that encloses the Ophiuchus, the Lupus, and the Pipe dark complexes using 42 million stars from the Two Micron All Sky Survey (2MASS) point…Marco Lombardi, Charles J. Lada, Joao Alves·Sep 22, 2008SaveLearn
BS196: an old star cluster far from the SMC main bodyWe present B and V photometry of the outlying SMC star cluster BS196 with the 4.1-m SOAR telescope. The photometry is deep (to V~25) showing ~3 mag below the cluster turnoff point (TO) at Mv=2.5…E. Bica, J. F. C. Santos, A. A. Schmidt·Sep 22, 2008SaveLearn
Star Formation in the Eagle NebulaM16 (the Eagle Nebula) is a striking star forming region, with a complex morphology of gas and dust sculpted by the massive stars in NGC 6611. Detailed studies of the famous ``elephant…Joana M. Oliveira·Sep 22, 2008SaveLearn
A measurement of large-scale peculiar velocities of clusters of galaxies: results and cosmological implicationsPeculiar velocities of clusters of galaxies can be measured by studying the fluctuations in the cosmic microwave background (CMB) generated by the scattering of the microwave photons by the hot X-ray…A. Kashlinsky, F. Atrio-Barandela, D. Kocevski et al.·Sep 22, 2008SaveLearn