Alternative Data Reduction Procedures for UVES: Wavelength Calibration and Spectrum AdditionThis paper addresses alternative procedures to the ESO supplied pipeline procedures for the reduction of UVES spectra of two quasar spectra to determine the value of the fundamental constant mu =…Rodger I. Thompson, Jill Bechtold, John H. Black et al.·Dec 5, 2008SaveLearn
Cosmic-ray electron signatures of dark matterThere is evidence for an excess in cosmic-ray electrons at about 500 GeV energy, that may be related to dark-matter annihilation. I have calculated the expected electron contributions from a pulsar…Martin Pohl·Dec 5, 2008SaveLearn
Flux transport solar dynamo models, current problems and possible solutionsThe sunspot solar cycle has been usually explained as the result of a dynamo process operating in the sun. This is a classical problem in Astrophysics that until the present is not fully solved. Here…G. Guerrero, E. M. de Gouveia Dal Pino·Dec 5, 2008SaveLearn
HATNet Field G205: Follow-Up Observations of 28 Transiting-Planet candidates and Confirmation of the Planet HAT-P-8bWe report the identification of 32 transiting-planet candidates in HATNet field G205. We describe the procedures that we have used to follow up these candidates with spectroscopic and photometric…David W. Latham, Gáspár Á. Bakos, Guillermo Torres et al.·Dec 5, 2008SaveLearn
Quasar optical variability: searching for interband time delaysAims. The main purpose of this paper is to study time delays between the light variations in different wavebands for a sample of quasars. Measuring a reliable time delay for a large number of quasars…Rumen S. Bachev·Dec 5, 2008SaveLearn
Analytical Blowup Solutions to the 2-dimensional Isothermal Euler-Poisson Equations of Gaseous StarsWe study the Euler-Poisson equations of describing the evolution of the gaseous star in astrophysics. Firstly, we construct a family of analytical blowup solutions for the isothermal case in R2.…Manwai Yuen·Dec 5, 2008SaveLearn
Long-term optical observations of Be/X-Ray binary system V0332+53We have been monitoring the binary system V0332+53 (optical counterpart is BQ Cam) since 2004 using 45 cm ROTSEIIId telescope and RTT150 (Russian-Turkish 1.5 m Telescope) located at Bakirlitepe,…U. Kiziloglu, N. Kiziloglu, A. Baykal et al.·Dec 5, 2008SaveLearn
Eclipse Timings of the Transient Low Mass X-ray Binary EXO0748-676. IV. The Rossi X-Ray Timing Explorer EclipsesWe report our complete database of X-ray eclipse timings of the low mass X-ray binary EXO0748-676 observed by the Rossi X-Ray Timing Explorer (RXTE) satellite. As of this writing we have accumulated…Michael T. Wolff, Paul S. Ray, Kent S. Wood et al.·Dec 4, 2008SaveLearn
A New Window of Exploration in the Mass Spectrum: Strong Lensing by Galaxy Groups in the SL2SThe existence of strong lensing systems with Einstein radii (Re) covering the full mass spectrum, from ~1-2" (produced by galaxy scale dark matter haloes) to >10" (produced by galaxy cluster…M. Limousin, R. Cabanac, R. Gavazzi et al.·Dec 4, 2008SaveLearn
Sensitivity of cosmic-ray experiments to ultra-high-energy photons: reconstruction of the spectrum and limits on the superheavy dark matterWe estimate the sensitivity of various experiments detecting ultra-high-energy cosmic rays to primary photons with energies above 1019 eV. We demonstrate that the energy of a primary photon may be…O. E. Kalashev, G. I. Rubtsov, S. V. Troitsky·Dec 4, 2008SaveLearn
The Formation and Survival of Discs in a Lambda-CDM UniverseWe study the formation of galaxies in a Lambda-CDM Universe using high resolution hydrodynamical simulations with a multiphase treatment of gas, cooling and feedback, focusing on the formation of…Cecilia Scannapieco, Simon D. M. White, Volker Springel et al.·Dec 4, 2008SaveLearn
Double Pair Production by Ultra High Energy Cosmic Ray PhotonsWith use of CompHEP package we've made the detailed estimate of the influence of double e+e- pair production by photons (DPP) on the propagation of ultra high energy electromagnetic cascade. We…S. V. Demidov, O. E. Kalashev·Dec 4, 2008SaveLearn
In search of progenitors for supernova-less GRBs 060505 and 060614: re-examination of their afterglowsGRB060505 and GRB060614 are nearby long-duration gamma-ray bursts (LGRBs) without accompanying supernovae (SNe) down to very strict limits. They thereby challenge the conventional LGRB-SN connection…D. Xu, R. L. C. Starling, J. P. U. Fynbo et al.·Dec 4, 2008SaveLearn
De-Trending Time Series for Astronomical Variability SurveysWe present a de-trending algorithm for the removal of trends in time series. Trends in time series could be caused by various systematic and random noise sources such as cloud passages, changes of…Dae-Won Kim, Pavlos Protopapas, Charles Alcock et al.·Dec 4, 2008SaveLearn
Large non-Gaussianity from two-component hybrid inflationWe study the generation of non-Gaussianity in models of hybrid inflation with two inflaton fields, (2-brid inflation). We analyse the region in the parameter and the initial condition space where a…Christian T. Byrnes, Ki-Young Choi, Lisa M. H. Hall·Dec 4, 2008SaveLearn
Prospects for Detecting Neutrino Signals from Annihilating/Decaying Dark Matter to Account for the PAMELA and ATIC resultsRecent PAMELA data show that positron fraction has an excess above several GeV while anti-proton one is not. Moreover ATIC data indicates that electron/positron flux have a bump from 300 GeV to 800…Jia Liu, Peng-fei Yin, Shou-hua Zhu·Dec 4, 2008SaveLearn
Testing large-scale (an)isotropy of ultra-high energy cosmic raysWe present a simple yet powerful method to test models of cosmic-ray (CR) origin using the distribution of CR arrival directions. The method is statistically unambiguous in the sense that it is…Hylke B. J. Koers, Peter Tinyakov·Dec 4, 2008SaveLearn
A Surprisingly High Pair Fraction for Extremely Massive Galaxies at z ~ 3 in the GOODS NICMOS SurveyWe calculate the major pair fraction and derive the major merger fraction and rate for 82 massive (M*>1011M) galaxies at 1.7 < z < 3.0 utilising deep HST NICMOS data taken in the…Asa F. L. Bluck, Christopher J. Conselice, Rychard J. Bouwens et al.·Dec 4, 2008SaveLearn
Distances to Galactic methanol masersWe present the first EVN parallax measurements of 6.7 GHz methanol masers in star forming regions of the Galaxy. The 6.7 GHz methanol maser transition is a very valuable astrometric tool, for its…K. L. J. Rygl, A. Brunthaler, K. M. Menten et al.·Dec 4, 2008SaveLearn
Two-Dimensional particle-in-cell simulations of the nonresonant, cosmic-ray driven instability in SNR shocksIn supernova remnants, the nonlinear amplification of magnetic fields upstream of collisionless shocks is essential for the acceleration of cosmic rays to the energy of the "knee" at…Yutaka Ohira, Brian Reville, John G. Kirk et al.·Dec 4, 2008SaveLearn
Super-ASTROD: Probing primordial gravitational waves and mapping the outer solar systemSuper-ASTROD (Super Astrodynamical Space Test of Relativity using Optical Devices or ASTROD III) is a mission concept with 3-5 spacecraft in 5 AU orbits together with an Earth-Sun L1/L2 spacecraft…Wei-Tou Ni·Dec 4, 2008SaveLearn
Disk Winds Driven by Magnetorotational Instability and Dispersal of Proto-Planetary DisksBy performing local three-dimensional MHD simulations of stratified accretion disks, we investigate disk winds driven by MHD turbulence. Initially given weak vertical magnetic fields are effectively…T. K. Suzuki, S. Inutsuka·Dec 4, 2008SaveLearn
Might we eventually understand the origin of the dark matter velocity anisotropy?The density profile of simulated dark matter structures is fairly well-established, and several explanations for its characteristics have been put forward. In contrast, the radial variation of the…Steen H. Hansen·Dec 4, 2008SaveLearn
Metallicity determination in gas-rich galaxies with semiempirical methodsA study of the precision of the semiempirical methods used in the determination of the chemical abundances in gas-rich galaxies is carried out. In order to do this the oxygen abundances of a total of…A. M. Hidalgo-Gamez, D. Ramirez-Fuentes·Dec 4, 2008SaveLearn
Gamma-Ray Burst afterglows: theory and observationsI discuss some theoretical expectations for the synchrotron emission from a relativistic blast-wave interacting with the ambient medium, as a model for GRB afterglows, and compare them with…A. Panaitescu·Dec 4, 2008SaveLearn