ESO VLT optical spectroscopy of BL Lacertae objects. III. An extension of the sampleWe present results of an ongoing program at the ESO VLT for spectroscopy of BL Lac objects lacking a firm redshift estimate and here we report on 15 objects. For 11 sources we confirm the BL Lac…B. Sbarufatti, S. Ciprini, J. Kotilainen et al.·Oct 20, 2008SaveLearn
Broad-band X-ray spectral evolution of GX 339-4 during a state transitionWe report on X-ray and soft gamma-ray observations of the black-hole candidate GX 339-4 during its 2007 outburst, performed with the RXTE and INTEGRAL satellites. The hardness-intensity diagram of…M. Del Santo, T. M. Belloni, J. Homan et al.·Oct 20, 2008SaveLearn
Multiline Zeeman signatures as demonstrated through the Pseudo-lineIn order to get a significant Zeeman signature in the polarised spectra of a magnetic star, we usually 'add' the contributions of numerous spectral lines; the ultimate goal is to recover the…M. Semel, J. C. Ramirez Velez, M. J. Stift et al.·Oct 20, 2008SaveLearn
MOST discovers a multimode delta Scuti star in a triple system: HD 61199A field star, HD 61199 (V ~ 8), simultaneously observed with Procyon by the MOST (Microvariability & Oscillations of STars) satellite in continuous runs of 34, 17, and 34 days in 2004, 2005, and…M. Hareter, O. Kochukhov, H. Lehmann et al.·Oct 20, 2008SaveLearn
Updated parameters for the transiting exoplanet WASP-3b using RISE, a new fast camera for the Liverpool TelescopeSome of the first results are reported from RISE - a new fast camera mounted on the Liverpool Telescope primarily designed to obtain high time resolution light curves of transiting extrasolar planets…N. P. Gibson, D. Pollacco, E. K. Simpson et al.·Oct 20, 2008SaveLearn
The Swift satellite lives up to its name, revealing cosmic explosions as they happenGamma-ray Bursts are the most powerful objects in the Universe. Discovered in the 1960's as brief flashes of gamma-radiation, we now know they emit across the entire electromagnetic spectrum, are…Rhaana L. C. Starling·Oct 20, 2008SaveLearn
On the central ionizing star of G23.96+0.15 and near-IR spectral classification of O starsAims: A near-infrared study of the main ionizing star of the ultracompact HII region G23.96+0.15 (IRAS 18317-0757) is presented, along with a re-evaluation of the distance to this source, and a…Paul A Crowther, James P Furness·Oct 20, 2008SaveLearn
First Results from the PAMELA Space MissionOn the 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight…M. Boezio, V. Bonvicini, G. Jerse et al.·Oct 20, 2008SaveLearn
The role of negative buoyancy in convective Cepheid models. Double-mode pulsations revisitedThe longstanding problem of modeling double-mode behaviour of classical pulsators was solved with the incorporation of turbulent convection into pulsation hydrocodes. However, the reasons for the…R. Smolec·Oct 20, 2008SaveLearn
Physical Classification of Galaxies with MOPED/VESPAThe availability of high-quality spectra for a large number of galaxies in the SDSS survey allows for a more sophisticated extraction of information about their stellar populations than, e.g., the…Raul Jimenez, Alan F. Heavens, Ben Panter et al.·Oct 20, 2008SaveLearn
Dynamics of the Disks of Nearby GalaxiesI describe how the dynamics of galactic disks can be inferred by imaging and spectroscopy. Next I demonstrate that the decomposition of the rotation curves of spiral galaxies into the contributions…B. Fuchs·Oct 20, 2008SaveLearn
Photochemical enrichment of deuterium in Titan's atmosphere: new insights from Cassini-HuygensCassini-Huygens data are used to re-examine the potential sources of the D/H enhancement over solar, measured in methane, in Titan's atmosphere. Assuming that the system is closed with respect to…D. Cordier, O. Mousis, I. J. Lunine et al.·Oct 20, 2008SaveLearn
New methods for large dynamical range problems in planetary formationModern N-body techniques for planetary dynamics are generally based on symplectic algorithms specially adapted to the Kepler problem. These methods have proven very useful in studying planet…D. S. McNeil, R. P. Nelson·Oct 20, 2008SaveLearn
Computation of Neutron Star Structure Using Modern Equation of StateUsing the modern equations of state derived from microscopic calculations, we have calculated the neutron star structure. For the neutron star, we have obtained a minimum mass about $0.1 …G. H. Bordbar, M. Hayati·Oct 20, 2008SaveLearn
Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304In the past few decades, several models have predicted an energy-dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule…H. E. S. S. Collaboration, :, F. Aharonian·Oct 20, 2008SaveLearn
NLTE model calculations for the solar atmosphere with an iterative treatment of opacity distribution functionsModeling the variability of the solar spectral irradiance is a key factor for understanding the solar influence on the climate of the Earth. As a first step to calculating the solar spectral…M. Haberreiter, W. Schmutz, I. Hubeny·Oct 20, 2008SaveLearn
Modification of Angular Velocity by Inhomogeneous MRI Growth in Protoplanetary DisksWe have investigated evolution of magneto-rotational instability (MRI) in protoplanetary disks that have radially non-uniform magnetic field such that stable and unstable regions coexist initially,…M. T. Kato, K. Nakamura, R. Tandokoro et al.·Oct 20, 2008SaveLearn
The Rise of Massive Red Galaxies: the color-magnitude and color-stellar mass diagrams for z < ~2 from the MUltiwavelength Survey by Yale-Chile (MUSYC)We present the color-magnitude and color-stellar mass diagrams for galaxies with zphot < ~2, based on a K < 22 (AB) catalog of the Extended Chandra Deep Field South (ECDFS) from the MUltiwavelength…Edward N Taylor, Marijn Franx, Pieter G van Dokkum et al.·Oct 20, 2008SaveLearn
Evidence for Merger-Driven Activity in the Clustering of High Redshift QuasarsRecently, a very large clustering length has been measured for quasars at a redshift of z~4. In combination with the observed quasar luminosity function we assess the implications of this clustering…Stuart Wyithe, Abraham Loeb·Oct 20, 2008SaveLearn
Giant Chromospheric Anemone Jet Observed with Hinode and Comparison with Magnetohydrodynamic Simulations: Evidence of Propagating Alfven Waves and Magnetic ReconnectionHinode discovered a beautiful giant jet with both cool and hot components at the solar limb on 2007 February 9. Simultaneous observations by the Hinode SOT, XRT, and TRACE 195 satellites revealed…N. Nishizuka, M. Shimizu, T. Nakamura et al.·Oct 20, 2008SaveLearn
Systematic Uncertainties in Black Hole Masses Determined from Single Epoch SpectraWe explore the nature of systematic errors that can arise in measurement of black hole masses from single-epoch spectra of active galactic nuclei (AGNs) by utilizing the many epochs available for NGC…Kelly D. Denney, Bradley M. Peterson, Matthias Dietrich et al.·Oct 20, 2008SaveLearn
Inspiralling Supermassive Black Holes: A New Signpost for Galaxy MergersWe present a new technique for observationally identifying galaxy mergers spectroscopically rather than through host galaxy imaging. Our technique exploits the dynamics of supermassive black holes…Julia M. Comerford, Brian F. Gerke, Jeffrey A. Newman et al.·Oct 19, 2008SaveLearn
Evidence for CO depletion in the inner regions of gas-rich protoplanetary disksWe investigate the physical properties and spatial distribution of Carbon Monoxide (CO) gas in the disks around the Herbig Ae/Be stars HD 97048 and HD 100546. Using high-spectral-resolution…G. van der Plas, M. E. van den Ancker, B. Acke et al.·Oct 19, 2008SaveLearn
Diagnostics of the Early Explosion Phase of a Classical Nova Using Its X-ray Emission: A Model for the X-ray Outburst of CI Camelopardalis in 1998We have computed a spherically symmetric model for the interaction of matter ejected during the outburst of a classical nova with the stellar wind from its optical component.This model is used to…E. V. Filippova, M. G. Revnivtsev, A. A. Lutovinov·Oct 19, 2008SaveLearn
Cosmic Ray Results from the IceTop Air Shower ArrayWe report on the first results obtained with the IceTop air shower array on the cosmic ray energy spectrum and mass composition in the range of 1 PeV to 80 PeV. IceTop is the surface detector of the…Hermann Kolanoski·Oct 19, 2008SaveLearn