Biased Dark Energy Constraints from Neglecting Reduced Shear in Weak Lensing SurveysThe weak gravitational lensing of distant galaxies by large-scale structure is expected to become a powerful probe of dark energy. By measuring the ellipticities of large numbers of background…Charles Shapiro·Dec 3, 2008SaveLearn
A Trigger and Readout Scheme for future Cherenkov Telescope ArraysThe next generation of ground-based gamma-ray observatories, such as e.g. CTA, will consist of about 50-100 telescopes, and cameras with in total ~100000 to ~200000 channels. The telescopes of the…G. Hermann, C. Bauer, C. Foehr et al.·Dec 3, 2008SaveLearn
EVN observations of the Ultra Luminous Infrared Galaxies IRAS 23365+3604 and IRAS 07251-0248We present high-sensitivity, high-resolution images of the Ultraluminous Infrared Galaxies (ULIRG; LFIR > 1012 L) IRAS 23365+3604 and IRAS 07251-0248, taken with the EVN at 6…Cristina Romero-Cañizales, Miguel Ángel Pérez-Torres, Antxon Alberdi·Dec 3, 2008SaveLearn
Quasiperiodic oscillations in a strong gravitational field around neutron stars testing braneworld modelsThe strong gravitational field of neutron stars in the brany universe could be described by spherically symmetric solutions with a metric in the exterior to the brany stars being of the…Andrea Kotrlova, Zdenek Stuchlik, Gabriel Torok·Dec 3, 2008SaveLearn
Binary Galaxies in the Local Supercluster and Its NeighborhoodWe report a catalog of 509 pairs identified among 10403 nearby galaxies with line-of-sight velocities VLG < 3500 km/s.We selected binary systems in accordance with two criteria (bounding and…I. D. Karachentsev, D. I. Makarov·Dec 3, 2008SaveLearn
Pattern Speed of Lopsidedness in Galactic DisksThe disks of spiral galaxies commonly show a lopsided mass distribution, with a typical fractional amplitude of 10 % for the Fourier component m=1. This is seen in both stars and gas, and the…Chanda J. Jog·Dec 3, 2008SaveLearn
Effects of scattering and dust grain size on the temperature structure of protoplanetary discs: A three-layer approachThe temperature in the optically thick interior of protoplanetary discs is essential for the interpretation of millimeter observations of the discs, for the vertical structure of the discs, for…Akio K. Inoue, Akinori Oka, Taishi Nakamoto·Dec 3, 2008SaveLearn
A New Look at Massive Clusters: weak lensing constraints on the triaxial dark matter halos of Abell 1689, Abell 1835, & Abell 2204Measuring the 3D distribution of mass on galaxy cluster scales is a crucial test of the LCDM model, providing constraints on the nature of dark matter. Recent work investigating mass distributions of…Virginia L. Corless, Lindsay J. King, Douglas Clowe·Dec 3, 2008SaveLearn
On the origin of double main-sequence turn-offs in star clusters of the Magellanic CloudsRecent observational studies of intermediate-age star clusters (SCs) in the Large Magellanic Cloud (LMC) have reported that a significant number of these objects show double main-sequence turn-offs…K. Bekki, A. D. Mackey·Dec 3, 2008SaveLearn
OGLE2-TR-L9: An extrasolar planet transiting a fast-rotating F3 starContext: Photometric observations for the OGLE-II microlens monitoring campaign have been taken in the period 1997-2000. All light curves of this campaign have recently been made public. Our analysis…I. A. G. Snellen, J. Koppenhoefer, R. F. J. van der Burg et al.·Dec 3, 2008SaveLearn
Evolution of Lyman Alpha Galaxies: Stellar Populations at z ~ 0.3We present the results of a stellar population analysis of 30 Lyman alpha emitting galaxies (LAEs) at z ~ 0.3, previously discovered with the Galaxy Evolution Explorer (GALEX). With a few exceptions,…Steven L. Finkelstein, Seth H. Cohen, Sangeeta Malhotra et al.·Dec 2, 2008SaveLearn
Impact of star formation inhomogeneities on merger rates and interpretation of LIGO resultsWithin the next decade, ground based gravitational wave detectors are in principle capable of determining the compact object merger rate per unit volume of the local universe to better than 20% with…R. O'Shaughnessy, R. Kopparapu, K. Belczynski·Dec 2, 2008SaveLearn
Discovery of Drifting High-frequency QPOs in Global Simulations of Magnetic Boundary LayersWe report on the numerical discovery of quasi-periodic oscillations (QPOs) associated with accretion through a non-axisymmetric magnetic boundary layer in the unstable regime, when two ordered…M. M. Romanova, A. K. Kulkarni·Dec 2, 2008SaveLearn
WIMPonium and Boost Factors for Indirect Dark Matter DetectionWe argue that WIMP dark matter can annihilate via long-lived "WIMPonium" bound states in reasonable particle physics models of dark matter (DM). WIMPonium bound states can occur at or near…John March-Russell, Stephen M. West·Dec 2, 2008SaveLearn
Implications of primordial black holes on the first stars and the origin of the super--massive black holesIf the cosmological dark matter has a component made of small primordial black holes, they may have a significant impact on the physics of the first stars and on the subsequent formation of massive…Cosimo Bambi, Douglas Spolyar, Alexander D. Dolgov et al.·Dec 2, 2008SaveLearn
Can the WIMP annihilation boost factor be boosted by the Sommerfeld enhancement?We demonstrate that the Sommerfeld correction to CDM annihilations can be appreciable if even a small component of the dark matter is extremely cold. Subhalo substructure provides such a possibility…Massimiliano Lattanzi, Joseph Silk·Dec 2, 2008SaveLearn
Search for Primordial Black Holes with SGARFACEThe Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) uses the Whipple 10 m telescope to search for bursts of γ rays. SGARFACE is sensitive to bursts with duration from a few ns to 20…M. Schroedter, F. Krennrich, S. LeBohec et al.·Dec 2, 2008SaveLearn
Non-linear Evolution of f(R) Cosmologies III: Halo StatisticsThe statistical properties of dark matter halos, the building blocks of cosmological observables associated with structure in the universe, offer many opportunities to test models for cosmic…Fabian Schmidt, Marcos Lima, Hiroaki Oyaizu et al.·Dec 2, 2008SaveLearn
Discriminating different scenarios to account for the cosmic e excess by synchrotron and inverse Compton radiationThe excesses of the cosmic positron fraction recently measured by PAMELA and the electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S. indicate the existence of primary electron and positron…Juan Zhang, Xiao-jun Bi, Jia Liu et al.·Dec 2, 2008SaveLearn
Signatures of the Baryon Acoustic Oscillations on the Convergence Power Spectrum of Weak lensing by Large Scale StructureWe employ an analytical approach to investigate the signatures of Baryon Acoustic Oscillations (BAOs) on the convergence power spectrum of weak lensing by large scale structure. It is shown that the…Tong-Jie Zhang, Qiang Yuan, Tian Lan·Dec 2, 2008SaveLearn
Cross-Correlation between UHECR Arrival Distribution and Large-Scale StructureWe investigate correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and the large-scale structure (LSS) of the Universe by using statistical quantities which can find…Hajime Takami, Takahiro Nishimichi, Kazuhiro Yahata et al.·Dec 2, 2008SaveLearn
Cosmological constraints from 21cm surveys after reionization21cm emission from residual neutral hydrogen after the epoch of reionization can be used to trace the cosmological power spectrum of density fluctuations. Using a Fisher matrix formulation, we…Eli Visbal, Abraham Loeb, Stuart Wyithe·Dec 2, 2008SaveLearn
Multi-Scale Morphological Analysis of SDSS DR5 Survey using the Metric Space TechniqueFollowing novel development and adaptation of the Metric Space Technique (MST), a multi-scale morphological analysis of the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) was performed. The…Yongfeng Wu, David J. Batuski, Andre Khalil·Dec 2, 2008SaveLearn
First measurement of the magnetic field on FK Com and its relation to the contemporaneous starspot locationsIn this study we present simultaneous low-resolution longitudinal magnetic field measurements and high-resolution spectroscopic observations of the cool single giant FK Com. The variation of the…H. Korhonen, S. Hubrig, S. V. Berdyugina et al.·Dec 2, 2008SaveLearn
Intergalactic Baryons in the Local UniverseSimulations predict that shocks from large-scale structure formation and galactic winds have reduced the fraction of baryons in the warm, photoionized phase (the Lya forest) from nearly 100% in the…Charles W. Danforth·Dec 2, 2008SaveLearn