Third Order Effect of Rotation on Stellar Oscillations of a β-Cephei StarHere the effect of rotation up to third order in the angular velocity of a star on the p, f and g modes is investigated. To do this, the third-order perturbation formalism presented by Soufi et al.…K. Karami·Oct 28, 2008SaveLearn
Spitzer/IRS Mapping of Local Luminous Infrared GalaxiesWe present results of our program Spitzer/IRS Mapping of local Luminous Infrared Galaxies (LIRGs). The maps cover the central 20"x20" or 30"x 30" regions of the galaxies, and use all…Miguel Pereira-Santaella, Almudena Alonso-Herrero, George H. Rieke et al.·Oct 28, 2008SaveLearn
Resolved debris disk emission around eta Tel: a young Solar System or ongoing planet formation?60% of the A star members of the 12 Myr old beta Pictoris moving group (BPMG) show significant excess emission in the mid-infrared, several million years after the proto-planetary disk is thought to…R. Smith, L. J. Churcher, M. C. Wyatt et al.·Oct 28, 2008SaveLearn
The mass-radius relationship from solar-type stars to terrestrial planets: a reviewIn this review, we summarize our present knowledge of the behaviour of the mass-radius relationship from solar-type stars down to terrestrial planets, across the regime of substellar objects, brown…G. Chabrier, I. Baraffe, J. Leconte et al.·Oct 28, 2008SaveLearn
Analog of Astrophysical Magnetorotational Instability in a Couette-Taylor Flow of Polymer FluidsWe report experimental observation of an instability in a Couette-Taylor flow of a polymer fluid in a thin gap between two coaxially rotating cylinders in a regime where their angular velocity…Stanislav Boldyrev, Don Huynh, Vladimir Pariev·Oct 28, 2008SaveLearn
Dust and Gas as Seeds for Metal-Poor Star FormationI address the issue of dust and gas as seeds for metal-poor star formation by reviewing what we know about star formation in nearby dwarf galaxies and its relationship to the gas and dust. I (try to)…Deidre A. Hunter·Oct 28, 2008SaveLearn
The dependence of HII region properties on global and local surface brightness within galaxy discsUsing B, R, and H-alpha images of roughly equal-sized samples of low surface brightness (LSB) and high surface brightness (HSB) galaxies (~40 galaxies apiece), we have explored the dependence of HII…J. F. Helmboldt, R. A. M. Walterbos, G. D. Bothun et al.·Oct 28, 2008SaveLearn
Resolving the Structure and Kinematics of the BN Object at 0."2 ResolutionWe present sensitive 7 mm observations of the H53α recombination line and adjacent continuum, made toward the Orion BN/KL region. In the continuum we detect the BN object, the radio source I (GMR…Luis F. Rodríguez, Luis A. Zapata, Paul T. P. Ho·Oct 28, 2008SaveLearn
New EUV Fe IX emission line identifications from Hinode/EISFour Fe IX transitions in the wavelength range 188--198 A are identified for the first time in spectra from the EUV Imaging Spectrometer on board the Hinode satellite. In particular the emission line…P. R. Young·Oct 28, 2008SaveLearn
The radio remnant of SN1993J: an instrumental explanation for the evolving complex structureWe present simulated images of Supernova 1993J at 8.4 GHz using Very Long Baseline Interferometry (VLBI) techniques. A spherically symmetric source model is convolved with realistic uv-plane…Ian Heywood, Katherine M. Blundell, Hans-Rainer Kloeckner et al.·Oct 28, 2008SaveLearn
Excitation and damping of p-mode oscillations of alpha Cen BThis paper presents an analysis of observational data on the p-mode spectrum of the star alpha Cen B and a comparison with theoretical computations of the stochastic excitation and damping of the…W. J. Chaplin, G. Houdek, Y. Elsworth et al.·Oct 28, 2008SaveLearn
Electron temperature fluctuations in NGC 346The existence and origin of large spatial temperature fluctuations in HII regions and planetary nebulae are assumed to explain the differences between the heavy element abundances inferred from…V. A. Oliveira, M. V. F. Copetti, A. C. Krabbe·Oct 28, 2008SaveLearn
Observation of an anomalous positron abundance in the cosmic radiationPositrons are known to be produced in interactions between cosmic-ray nuclei and interstellar matter ("secondary production"). Positrons may, however, also be created by dark matter particle…O. Adriani, G. C. Barbarino, G. A. Bazilevskaya et al.·Oct 28, 2008SaveLearn
Two years of flight of the Pamela experiment: results and perspectivesPAMELA is a satellite borne experiment designed to study with great accuracy cosmic rays of galactic, solar, and trapped nature in a wide energy range (protons: 80 MeV-700 GeV, electrons 50 MeV-400…M. Casolino, Pamela Collaboration·Oct 28, 2008SaveLearn
The radial BAO scale and Cosmic Shear, a new observable for Inhomogeneous CosmologiesAs an alternative explanation of the dimming of distant supernovae it has recently been advocated that we live in a special place in the Universe near the centre of a large spherical void described…Juan Garcia-Bellido, Troels Haugboelle·Oct 28, 2008SaveLearn
Near-IR Search for Lensed Supernovae Behind Galaxy Clusters - II. First Detection and Future ProspectsPowerful gravitational telescopes in the form of massive galaxy clusters can be used to enhance the light collecting power over a limited field of view by about an order of magnitude in flux. This…A. Goobar, K. Paech, V. Stanishev et al.·Oct 27, 2008SaveLearn
On the radiative efficiencies, Eddington ratios, and duty cycles of luminous high-redshift quasarsWe investigate the characteristic radiative efficiency ε, Eddington ratio λ, and duty cycle P0 of high-redshift active galactic nuclei (AGN), drawing on measurements of the AGN luminosity function…Francesco Shankar, Martin Crocce, Jordi Miralda-Escude' et al.·Oct 27, 2008SaveLearn
Improved Standardization of Type II-P Supernovae: Application to an Expanded SampleIn the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and…Dovi Poznanski, Nathaniel Butler, Alexei V. Filippenko et al.·Oct 27, 2008SaveLearn
Implications of the VHE Gamma-Ray Detection of the Quasar 3C279The MAGIC collaboration recently reported the detection of the quasar 3C279 at > 100 GeV gamma-ray energies. Here we present simultaneous optical (BVRI) and X-ray (RXTE PCA) data from the day of the…Markus Boettcher, Anita Reimer, Alan P. Marscher·Oct 27, 2008SaveLearn
GRB060614: a "fake" short GRB from a merging binary system(Shortened) CONTEXT: [...] GRB060614 is the first nearby long duration GRB clearly not associated to a bright Ib/c supernova. Moreover, its duration (T90 ~ 100s) makes it hardly classifiable as a…Letizia Caito, Maria Grazia Bernardini, Carlo Luciano Bianco et al.·Oct 27, 2008SaveLearn
Nearby Spiral Galaxy Globular Cluster Systems II: Globular Cluster Abundances in NGC 300We present new metallicity estimates for globular cluster (GC) candidates in the Sd spiral NGC 300, one of the nearest spiral galaxies outside the Local Group. We have obtained optical spectroscopy…J. B. Nantais, J. P. Huchra, P. Barmby et al.·Oct 27, 2008SaveLearn
On the contribution of large scale structure to strong gravitational lensingWe study the correlation between the locations of galaxy-galaxy strong lensing candidates and tracers of large-scale structure from both weak lensing or X-ray emission. The COSMOS survey is a unique…C. Faure, J. -P. Kneib, S. Hilbert et al.·Oct 27, 2008SaveLearn
Quintom dark energy models with nearly flat potentialsWe examine quintom dark energy models, produced by the combined consideration of a canonical and a phantom field, with nearly flat potentials and dark energy equation-of-state parameter wDE…M. R. Setare, E. N. Saridakis·Oct 27, 2008SaveLearn
The spatial clustering of X-ray selected AGN in the XMM-COSMOS fieldWe study the spatial clustering of 538 X-ray selected AGN in the 2 deg2 XMM-COSMOS field that are spectroscopically identified to IAB<23 and span the redshift range z=0.2-3.0. The median redshift…R. Gilli, G. Zamorani, T. Miyaji et al.·Oct 27, 2008SaveLearn
A theoretical framework for the detection of point-sources in Cosmic Microwave Background mapsThe detection of point-sources in microwave maps is a critical step in the analysis of the Cosmic Microwave Background (CMB) data. If not properly removed, these sources have adverse effects on the…R. Vio, P. Andreani·Oct 27, 2008SaveLearn