An Inexpensive Field-Widened Monolithic Michelson Interferometer for Precision Radial Velocity MeasurementsWe have constructed a thermally compensated field-widened monolithic Michelson interferometer that can be used with a medium-resolution spectrograph to measure precise Doppler radial velocities of…Suvrath Mahadevan, Jian Ge, Scott W. Fleming et al.·Sep 22, 2008SaveLearn
Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNsIn the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cutoff in the ultra-high energy cosmic-ray (UHECR) spectrum, and an apparent clustering of the…F. Fraschetti, F. Melia·Sep 22, 2008SaveLearn
A detailed analysis of structure growth in f(R) theories of gravityWe investigate the connection between dark energy and fourth order gravity by analyzing the behavior of scalar perturbations around a Friedmann-Robertson-Walker background. The evolution equations…Kishore N. Ananda, Sante Carloni, Peter K. S. Dunsby·Sep 22, 2008SaveLearn
On Cosmic Rays SourcesStudy of astrophysical objects with strong dipolar magnetic fields show that the spectrum of the accelerated charged particles leaving the sources has a power law form with exponent -2.5, where the…G. Pizzella·Sep 22, 2008SaveLearn
The Radio Cerenkov Technique for Ultra-High Energy Neutrino DetectionI review the status of the Radio Cerenkov detection technique in searches for ultra-high energy (UHE) neutrinos of cosmic origin. After outlining the physics motivations for UHE neutrino searches, I…Amy Connolly·Sep 22, 2008SaveLearn
Time-dependent models of dense PDRs with complex moleculesWe present a study of the chemistry of a dense photon-dominated region (PDR) using a time-dependent chemical model. Our major interest is to study the spatial distribution of complex molecules such…O. Morata, E. Herbst·Sep 22, 2008SaveLearn
Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge Injection Technique in OrbitThe X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite is an X-ray CCD camera system that has superior performance such as a low background, high quantum efficiency, and good energy…Midori Ozawa, Hideki Uchiyama, Hironori Matsumoto et al.·Sep 22, 2008SaveLearn
Nonlinear Instability of kink oscillations due to shear motionsFirst results from a high-resolution three-dimensional nonlinear numerical study of the kink oscillation are presented. We show in detail the development of a shear instability in an untwisted…J. Terradas, J. Andries, M. Goossens et al.·Sep 22, 2008SaveLearn
Behavior of the reflection function of a plane-parallel medium for directions of incidence and reflection tending to horizontal directionsThe atmospheres of (exo) planets and moons, as well as reflection nebulae, contain in general independently scattering particles in random orientation and are often supposed to be plane-parallel.…J. W. Hovenier D. M. Stam·Sep 22, 2008SaveLearn
The Serpens Molecular CloudThe Serpens cloud has received considerable attention in the last years, in particular the small region known as the Serpens cloud core where a plethora of star formation related phenomena are found.…C. Eiroa, A. A. Djupvik, M. M. Casali·Sep 22, 2008SaveLearn
Recent Topics on Very High Energy Gamma-ray AstronomyWith the advent of imaging atmospheric Cherenkov telescopes in late 1980's, ground-based observation of TeV gamma-rays came into reality after struggling trials by pioneers for twenty years, and…Masaki Mori·Sep 22, 2008SaveLearn
The Suzaku Observations of SS Cygni in Quiescence and OutburstWe present results from the Suzaku observations of the dwarf nova SS Cyg in quiescence and outburst in 2005 November. Owing to high sensitivity of the HXD PIN detector and high spectral resolution of…Manabu Ishida, Shunsaku Okada, Takayuki Hayashi et al.·Sep 21, 2008SaveLearn
Winds and Accretion in Young StarsEstablishing the origin of accretion powered winds from forming stars is critical for understanding angular momentum evolution in the star-disk interaction region. Here, the high velocity component…Suzan Edwards·Sep 21, 2008SaveLearn
A Young Planet Search in Visible and IR Light: DN Tau, V836 Tau, and V827 TauIn searches for low-mass companions to late-type stars, correlation between radial velocity variations and line bisector slope changes indicates contamination by large starspots. Two young stars…L. Prato, M. Huerta, C. M. Johns-Krull et al.·Sep 21, 2008SaveLearn
Magnetic Braking and Protostellar Disk Formation: Ambipolar DiffusionIt is established that the formation of rotationally supported disks during the main accretion phase of star formation is suppressed by a moderately strong magnetic field in the ideal MHD limit.…Richard R. Mellon, Zhi-Yun Li·Sep 21, 2008SaveLearn
An Approach Detecting the Event Horizon of Sgr A*Imaging the vicinity of a black hole is one of the ultimate goals of VLBI astronomy. The closest massive black hole, Sgr A*, located at the Galactic center, is the leading candidate for such…Makoto Miyoshi, Seiji Kameno, Jose K. Ishituka et al.·Sep 21, 2008SaveLearn
The velocity-density relation in the spherical modelWe study the cosmic velocity-density relation using the spherical collapse model (SCM) as a proxy to non-linear dynamics. Although the dependence of this relation on cosmological parameters is known…Maciej Bilicki, Michał Chodorowski·Sep 21, 2008SaveLearn
The resonant structure of Jupiter's trojan asteroids-II. What happens for different configurations of the planetary systemIn a previous paper, we have found that the resonance structure of the present Jupiter Trojan swarms could be split up into four different families of resonances. Here, in a first step, we generalize…Philippe Robutel, Julien Bodossian·Sep 20, 2008SaveLearn
The non-adiabatic pressure in general scalar field systemsWe discuss the non-adiabatic or entropy perturbation, which controls the evolution of the curvature perturbation in the uniform density gauge, for a scalar field system minimally coupled to gravity…Adam J. Christopherson, Karim A. Malik·Sep 20, 2008SaveLearn
Dark energy perturbations and cosmic coincidenceWhile there is plentiful evidence in all fronts of experimental cosmology for the existence of a non-vanishing dark energy (DE) density ρD in the Universe, we are still far away from having a…Javier Grande, Ana Pelinson, Joan Sola·Sep 20, 2008SaveLearn
Suzaku and XMM-Newton Observations of Diffuse X-ray Emission from the Eastern Tip Region of the Carina NebulaThe eastern tip region of the Carina Nebula was observed with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. XMM-Newton EPIC data of this region were…Yuichiro Ezoe, Kenji Hamaguchi, Robert A. Gruendl et al.·Sep 20, 2008SaveLearn
Sersiclets - A Matched Filter Extension of Shapelets for Weak Lensing StudiesThe precision study of dark matter using weak lensing by large scale structure is strongly constrained by the accuracy with which one can measure galaxy shapes. Several methods have been devised but…Wai-Hin Wayne Ngan, Ludovic Van Waerbeke, Andisheh Mahdavi et al.·Sep 19, 2008SaveLearn
Spinning down newborn neutron stars: nonlinear development of the r-mode instabilityWe model the nonlinear saturation of the r-mode instability via three-mode couplings and the effects of the instability on the spin evolution of young neutron stars. We include one mode triplet…Ruxandra Bondarescu, Saul A. Teukolsky, Ira Wasserman·Sep 19, 2008SaveLearn
SDSSJ092712.65+294344.0: a candidate massive black hole binaryIn this Letter we explore the hypothesis that the quasar SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circumbinary disc. The lightest, secondary black hole is active,…M. Dotti, C. Montuori, R. Decarli et al.·Sep 19, 2008SaveLearn
High-Ion Absorption in Seven GRB Host Galaxies at z=2-4: Evidence for both Circumburst Plasma and Outflowing Interstellar Gas(Abridged) We use VLT/UVES high-resolution optical spectroscopy of seven GRB afterglows at zGRB>2 to investigate circumburst and interstellar plasma in the host galaxies. Our sample consists of GRBs…Andrew J. Fox, Cédric Ledoux, Paul M. Vreeswijk et al.·Sep 19, 2008SaveLearn