Sound waves in the intracluster medium of the Centaurus clusterWe report the discovery of ripple-like X-ray surface brightness oscillations in the core of the Centaurus cluster of galaxies, found with 200 ks of Chandra observations. The features are between 3 to…J. S Sanders, A. C. Fabian·Aug 18, 2008SaveLearn
Molecular Emission Line Formation in Prestellar CoresWe investigate general aspects of molecular line formation under conditions which are typical of prestellar cores. Focusing on simple linear molecules, we study formation of their rotational lines by…Ya. Pavlyuchenkov, D. Wiebe, B. Shustov et al.·Aug 18, 2008SaveLearn
Direct X-ray Spectral Deprojection of Galaxy ClustersTemperature, density and abundance profiles of the hot intracluster medium (ICM) are important diagnostics of the complex interactions of gravitational and feedback processes in the cores of galaxy…H. R. Russell, J. S. Sanders, A. C. Fabian·Aug 18, 2008SaveLearn
Extreme multiplex spectroscopy at wide-field 4-m telescopesWe describe the design and science case for a spectrograph for the prime focus of classical 4-m wide-field telescopes that can deliver at least 4000 MOS slits over a 1 degree field. This extreme…Robert Content, Tom Shanks·Aug 18, 2008SaveLearn
Integral and Rxte/Asm Observations on Igr J17098-3628To probe further the possible nature of the unidentified source IGR J17098-3628, we have carried out a detailed analysis of its long-term time variability as monitored by RXTE/ASM, and of its hard…Yu-Peng Chen, Shu Zhang, Nick Schurch et al.·Aug 18, 2008SaveLearn
The dynamics of internal working surfaces in MHD jetsThe dynamical effects of magnetic fields in models of radiative, Herbig-Haro (HH) jets have been studied in a number of papers. For example, magnetized, radiative jets from variable sources have been…Fabio De Colle, Alejandro Raga, Alejandro Esquivel·Aug 18, 2008SaveLearn
Axisymmetric Magnetorotational Instability in Viscous Accretion DisksAxisymmetric magnetorotational instability (MRI) in viscous accretion disks is investigated by linear analysis and two-dimensional nonlinear simulations. The linear growth of the viscous MRI is…Youhei Masada, Takayoshi Sano·Aug 18, 2008SaveLearn
Evidence of convective rolls in a sunspot penumbraaims: We study the recently discovered twisting motion of bright penumbral filaments with the aim of constraining their geometry and the associated magnetic field. methods: A large sunspot located…V. Zakharov, J. Hirzberger, T. L. Riethmueller et al.·Aug 18, 2008SaveLearn
Turbulence-driven Polar Winds from T Tauri Stars Energized by Magnetospheric AccretionPre-main-sequence stars are observed to be surrounded by both accretion flows and some kind of wind or jet-like outflow. Recent work by Matt and Pudritz has suggested that if classical T Tauri stars…Steven R. Cranmer·Aug 18, 2008SaveLearn
The impact of dust on the scaling properties of galaxy clustersWe investigate the effect of dust on the scaling properties of galaxy clusters based on hydrodynamic N-body simulations of structure formation. We have simulated five dust models plus a radiative…Antonio C. da Silva, Andrea Catalano, Ludovic Montier et al.·Aug 17, 2008SaveLearn
Sound Waves Excitation by Jet-Inflated Bubbles in Clusters of GalaxiesWe show that repeated sound waves in the intracluster medium (ICM) can be excited by a single inflation episode of an opposite bubble pair. To reproduce this behavior in numerical simulations the…Assaf Sternberg, Noam Soker·Aug 17, 2008SaveLearn
Multi-telescope timing of PSR J1518+4904PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, and testing…G. H. Janssen, B. W. Stappers, M. Kramer et al.·Aug 17, 2008SaveLearn
Candidate Disk Wide Binaries in the Sloan Digital Sky SurveyUsing SDSS Data Release 6, we construct two independent samples of candidate stellar wide binaries selected as i) pairs of unresolved sources with angular separation in the range 3'' -…Branimir Sesar, Zeljko Ivezic, Mario Juric·Aug 17, 2008SaveLearn
Quasi-Hilda Comet 147P/Kushida-Muramatsu: Another long temporary satellite capture by JupiterThe quasi-Hilda comets (QHCs), being in unstable 3:2 Jovian mean motion resonance, are considered a major cause of temporary satellite capture (TSC) by Jupiter. Though the QHCs may be escaped Hilda…Katsuhito Ohtsuka, Takashi Ito, Makoto Yoshikawa et al.·Aug 16, 2008SaveLearn
A Possible Icy Kuiper Belt around HD 181327We have obtained a Gemini South T-ReCS Qa-band (18.3 micron) image and a Spitzer MIPS SED-mode observation of HD181327, an F5/F6V member of the ~12 Myr old beta Pictoris moving group. We resolve the…Christine H. Chen, Michael P. Fitzgerald, Paul S. Smith·Aug 16, 2008SaveLearn
Simulation of Imaging Atmospheric Cherenkov Telescopes with CORSIKA and simtelarrayImaging Atmospheric Cherenkov Telescopes (IACTs) have resulted in a breakthrough in very-high energy (VHE) gamma-ray astrophysics. While early IACT installations faced the problem of detecting any…Konrad Bernlohr·Aug 16, 2008SaveLearn
Rotation-Resolved Spectroscopy of a Very Young Asteroid, (1270) Datura(1270) Datura is the largest member of a very young asteroid cluster that was thought to be broken-up 0.45 Myr ago. The light-curve and the rotation-resolved reflectance spectra (0.6 um - 1.0 um)…Naruhisa Takato·Aug 16, 2008SaveLearn
On the Importance of the Interclump Medium for Superionization: O VI Formation in the Wind of Zeta PupWe have studied superionization and X-ray line formation in the spectra of Zeta Pup using our new stellar atmosphere code (XCMFGEN) that can be used to simultaneously analyze optical, UV, and X-ray…J. Zsargo, D. J. Hillier, J. -C. Bouret et al.·Aug 16, 2008SaveLearn
Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536We present an analysis of XMM-Newton and RXTE data from three observations of the neutron star LMXB 4U 1636-536. The X-ray spectra show clear evidence of a broad, asymmetric iron emission line…Dirk Pandel, Philip Kaaret, Stephane Corbel·Aug 15, 2008SaveLearn
Challenges to the DGP Model from Horizon-Scale Growth and GeometryWe conduct a Markov Chain Monte Carlo study of the Dvali-Gabadadze-Porrati (DGP) self-accelerating braneworld scenario given the cosmic microwave background (CMB) anisotropy, supernovae and Hubble…Wenjuan Fang, Sheng Wang, Wayne Hu et al.·Aug 15, 2008SaveLearn
The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. I. Classical Cepheids in the Large Magellanic CloudWe present the first part of a new catalog of variable stars (OIII-CVS) compiled from the data collected in the course of the third phase of the Optical Gravitational Lensing Experiment (OGLE-III).…I. Soszynski, R. Poleski, A. Udalski et al.·Aug 15, 2008SaveLearn
Evolution of scalar perturbations in cosmology with quintessential dark energyThe dynamics of expansion of the Universe and evolution of scalar perturbations are studied for the quintessential scalar fields Q with the classical Lagrangian satisfying the additional condition…B. Novosyadlyj, O. Sergijenko·Aug 15, 2008SaveLearn
Metallicity-corrected Tip of the Red Giant Branch Distance to NGC 4258We have determined the distance to NGC 4258 using observations made with the Hubble Space Telescope (HST) and the Wide Field, Advanced Camera for Surveys (ACS/WFC). We apply a modified technique that…Violet A. Mager, Barry F. Madore, Wendy L. Freedman·Aug 15, 2008SaveLearn
Magnetic Reconnection by a Self-Retreating X-LineParticle-in-cell (PIC) simulations of collisionless magnetic reconnection are performed to study asymmetric reconnection in which an outflow is blocked by a hard wall while leaving sufficiently large…M. Oka, M. Fujimoto, T. K. M. Nakamura et al.·Aug 15, 2008SaveLearn
Tidal disruption and ignition of white dwarfs by moderately massive black holesWe present a numerical investigation of the tidal disruption of white dwarfs by moderately massive black holes, with particular reference to the centers of dwarf galaxies and globular clusters.…S. Rosswog, E. Ramirez-Ruiz, R. Hix·Aug 15, 2008SaveLearn