Structure and Formation of Elliptical and Spheroidal GalaxiesNew surface photometry of all known elliptical galaxies in the Virgo cluster is added to published data to derive composite profiles over large dynamic ranges. Sersic functions fit them remarkably…John Kormendy, David B. Fisher, Mark E. Cornell et al.·Oct 9, 2008SaveLearn
AGILE detection of intense gamma-ray emission from the blazar PKS 1510-089We report the detection by the AGILE (Astro-rivelatore Gamma a Immagini LEggero) satellite of an intense gamma-ray flare from the source AGL J1511-0909, associated with the powerful quasar PKS…G. Pucella, V. Vittorini, F. D'Ammando et al.·Oct 9, 2008SaveLearn
Radial Velocity Studies of Close Binary Stars. XIVRadial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for ten close binary systems: TZ Boo, VW Boo, EL Boo, VZ CVn, GK Cep, RW Com, V2610 Oph, V1387…Theodor Pribulla, Slavek M. Rucinski, Heide DeBond et al.·Oct 9, 2008SaveLearn
A Schmidt-Kennicutt law for star formation in the Milky Way diskWe use a new method to trace backwards the star formation history of the Milky Way disk, using a sample of M dwarfs in the solar neighbourhood which is representative for the entire solar circle. M…B. Fuchs, H. Jahreiss, C. Flynn·Oct 9, 2008SaveLearn
Atomic jets from class 0 sources detected by Spitzer: the case of L1448-CWe present Spitzer-IRS spectra obtained along the molecular jet from the Class 0 source L1448-C (or L1448-mm). Atomic lines from the fundamental transitions of [FeII], [SiII] and [SI] have been…O. Dionatos, B. Nisini, R. Garcia Lopez et al.·Oct 9, 2008SaveLearn
Warp and eccentricity propagation in discs around black holesWe consider the inward propagation of warping and eccentric disturbances in discs around black holes under a wide variety of conditions. In our calculations we use secular theories of warped and…Barbara T. Ferreira, Gordon I. Ogilvie·Oct 9, 2008SaveLearn
A strict lower-limit EBL: Applications on gamma-ray absorptionA strict lower limit flux for the extragalactic background light from ultraviolet to the far-infrared photon energies is presented. The spectral energy distribution is derived using an established…Tanja M. Kneiske, Herve Dole·Oct 9, 2008SaveLearn
Can opacity changes help to reproduce the hybrid star pulsations?Hybrid stars like Nu Eridani and 12 Lacertae show two different types of pulsations: (i) low-order acoustic and gravity modes of the Beta Cephei type with periods of about 3-6 hours, and (ii)…Thomas Zdravkov, Alexey A. Pamyatnykh·Oct 9, 2008SaveLearn
On the Origin of TeV Gamma-ray Emission from HESS J1834-087We present an X-ray study of the field containing the extended TeV source HESS J1834-087 using data obtained with the XMM-Newton telescope. Previously, the coincidence of this source with both the…R. Mukherjee, E. V. Gotthelf, J. P. Halpern·Oct 9, 2008SaveLearn
X-Ray Observation of Very High Energy Gamma-Ray Source, HESS J1745-303, with SuzakuSuzaku observations of a TeV unidentified (unID) source, HESS J1745-303, are presented. A possible excess of neutral iron line emission is discovered, and is likely associated with the main part of…Aya Bamba, Ryo Yamazaki, Kazunori Kohri et al.·Oct 9, 2008SaveLearn
A Unified Monte Carlo Treatment of Gas-Grain Chemistry for Large Reaction Networks. I. Testing Validity of Rate Equations in Molecular CloudsIn this study we demonstrate for the first time that the unified Monte Carlo approach can be applied to model gas-grain chemistry in large reaction networks. Specifically, we build a time-dependent…A. I. Vasyunin, D. A. Semenov, D. S. Wiebe et al.·Oct 9, 2008SaveLearn
Selection Functions in Doppler Planet SearchesWe present a preliminary analysis of the sensitivity of Anglo-Australian Planet Search data to the orbital parameters of extrasolar planets. To do so, we have developed new tools for the automatic…S. J. O'Toole, C. G. Tinney, H. R. A. Jones et al.·Oct 9, 2008SaveLearn
Large-scale Dynamo Action Driven by Velocity Shear and Rotating ConvectionBy incorporating a large-scale shear flow into turbulent rotating convection, we show that a sufficiently strong shear can promote dynamo action in flows that in the absence of shear do not act as…David W. Hughes, Michael R. E. Proctor·Oct 9, 2008SaveLearn
CCD and photon-counting photometric observations of asteroids carried out at Padova and Catania observatoriesWe present the results of observational campaigns of asteroids performed at Asiago Station of Padova Astronomical Observatory and at M.G. Fracastoro Station of Catania Astrophysical Observatory, as…Davide Gandolfi, Massimo Cigna, Daniele Fulvio et al.·Oct 9, 2008SaveLearn
The Mass and Radius of the Neutron Star in EXO 1745-248Bursting X-ray binaries in globular clusters are ideal sources for measuring neutron star masses and radii, and hence, for determining the equation of state of cold, ultradense matter. We use…Feryal Ozel, Tolga Guver, Dimitrios Psaltis·Oct 9, 2008SaveLearn
Variational Integrators for Almost-Integrable SystemsWe construct several variational integrators--integrators based on a discrete variational principle--for systems with Lagrangians of the form L = LA + epsilon LB, with epsilon << 1, where LA…Will M. Farr·Oct 8, 2008SaveLearn
Pulsars as the Sources of High Energy Cosmic Ray PositronsRecent results from the PAMELA satellite indicate the presence of a large flux of positrons (relative to electrons) in the cosmic ray spectrum between approximately 10 and 100 GeV. As annihilating…Dan Hooper, Pasquale Blasi, Pasquale Dario Serpico·Oct 8, 2008SaveLearn
Radiation-magnetohydrodynamic simulations of the photoionisation of magnetised globulesWe present the first three-dimensional radiation-magnetohydrodynamic simulations of the photoionisation of a dense, magnetised molecular globule by an external source of ultraviolet radiation. We…William J. Henney, S. Jane Arthur, Fabio De Colle et al.·Oct 8, 2008SaveLearn
The Diversity and Similarity of Simulated Cold Dark Matter HalosWe study the mass, velocity dispersion, and anisotropy profiles of ΛCDM halos using a suite of N-body simulations of unprecedented numerical resolution (the Aquarius Project). Our analysis…Julio F. Navarro, Aaron Ludlow, Volker Springel et al.·Oct 8, 2008SaveLearn
Forecasting Cosmological Constraints from Redshift SurveysObservations of redshift-space distortions in spectroscopic galaxy surveys offer an attractive method for observing the build-up of cosmological structure, which depends both on the expansion rate of…Martin White, Yong-Seon Song, Will J. Percival·Oct 8, 2008SaveLearn
High-Resolution Timing Observations of Spin-Powered Pulsars with the AGILE Gamma-Ray TelescopeAGILE is a small gamma-ray astronomy satellite mission of the Italian Space Agency dedicated to high-energy astrophysics launched in 2007 April. Its 1 microsecond absolute time tagging capability…A. Pellizzoni, M. Pilia, A. Possenti et al.·Oct 8, 2008SaveLearn
iCosmo: an Interactive Cosmology PackageAims: The interactive software package iCosmo, designed to perform cosmological calculations is described. Methods: iCosmo is a software package to perform interactive cosmological calculations for…Alexandre Refregier, Adam Amara, Thomas Kitching et al.·Oct 8, 2008SaveLearn
Indirect Dark Matter SignalsDark Matter annihilation (DMA) may yield an excess of gamma rays and antimatter particles, like antiprotons and positrons, above the background from cosmic ray interactions. Several signatures,…W. de Boer·Oct 8, 2008SaveLearn
A Study of the X-Ray Dust Scattering Halo of Cyg X-1 with a Cross-Correlation MethodX-ray photons scattered by the interstellar medium carry information about dust distribution, dust grain model, scattering cross section, and the distance of the source; they also take longer time…Zhixing Ling, Shuang Nan Zhang, Jingen Xiang et al.·Oct 8, 2008SaveLearn
An Alternative Origin for Hypervelocity StarsHalo stars with unusually high radial velocity ("hypervelocity" stars, or HVS) are thought to be stars unbound to the Milky Way that originate from the gravitational interaction of stellar…Mario G. Abadi, Julio F. Navarro, Matthias Steinmetz·Oct 8, 2008SaveLearn