Exploring the consequences of pairing algorithms for binary starsKnowledge of the binary population in stellar groupings provides important information about the outcome of the star forming process in different environments (see, e.g., Blaauw 1991, and references…M. B. N. Kouwenhoven, A. G. A. Brown, S. P. Goodwin et al.·Nov 18, 2008SaveLearn
Where are all the Young Stars in Aquila?The high Galactic longitude end of the Aquila Rift comprises the large Aquila molecular cloud complex, however, few young stars are known to be located in the area, and only one is directly…L. Prato, E. L. Rice, T. M. Dame·Nov 18, 2008SaveLearn
Stellar Velocity Profiles and Line-Strengths out to Four Effective Radii in the Early-Type Galaxy NGC 3379We describe a new technique to measure stellar kinematics and line-strengths at large radii in nearby galaxies. Using the integral-field spectrograph SAURON as a 'photon-collector', we obtain…A. Weijmans, M. Cappellari, P. T. de Zeeuw et al.·Nov 18, 2008SaveLearn
Cosmological RecombinationIn this thesis we focus on studying the physics of cosmological recombination and how the details of recombination affect the Cosmic Microwave Background (CMB) anisotropies. We present a detailed…Wan Yan Wong·Nov 18, 2008SaveLearn
Resolving the discrepancy between lensing and X-ray mass estimates of the complex galaxy cluster Abell 1689There is a long-standing discrepancy between galaxy cluster masses determined from X-ray and gravitational lensing observations of which Abell 1689 is a well-studied example. In this work we take…Signe Riemer-Sorensen, Danka Paraficz, Desiree Della Monica Ferreira et al.·Nov 18, 2008SaveLearn
Stability of a Spherical Accretion Shock with Nuclear DissociationWe examine the stability of a standing shock wave within a spherical accretion flow onto a gravitating star, in the context of core-collapse supernova explosions. Our focus is on the effect of…Rodrigo Fernández, Christopher Thompson·Nov 17, 2008SaveLearn
Gauss's method for secular dynamics, softenedWe show that the algorithm proposed by Gauss to compute the secular evolution of gravitationally interacting Keplerian rings extends naturally to softened gravitational interactions. The resulting…J. R. Touma, S. Tremaine, M. V. Kazandjian·Nov 17, 2008SaveLearn
Bright High z SnIa: A Challenge for LCDM?It has recently been pointed out by Kowalski et. al. (arxiv:0804.4142) that there is `an unexpected brightness of the SnIa data at z>1'. We quantify this statement by constructing a new statistic…L. Perivolaropoulos, A. Shafieloo·Nov 17, 2008SaveLearn
Aetherizing Lambda: Barotropic Fluids as Dark EnergyWe examine the class of barotropic fluid models of dark energy, in which the pressure is an explicit function of the density, p = f(ρ). Through general physical considerations we constrain the…Eric V. Linder, Robert J. Scherrer·Nov 17, 2008SaveLearn
Arecibo Pulsar Survey Using ALFA: Probing Radio Pulsar Intermittency and TransientsWe present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) Survey of the Galactic plane. We have discovered seven objects by detecting isolated…J. S. Deneva, J. M. Cordes, M. A. McLaughlin et al.·Nov 17, 2008SaveLearn
Directional detection of Dark MatterAmong the many experimental techniques available, those providing directional information have the potential of yielding an unambiguous observation of WIMPs even in the presence of insidious…Gabriella Sciolla·Nov 17, 2008SaveLearn
Energy ejection in the collapse of a cold spherical self-gravitating cloudWhen an open system of classical point particles interacting by Newtonian gravity collapses and relaxes violently, an arbitrary amount of energy may in principle be carried away by particles which…M. Joyce, B. Marcos, F. Sylos Labini·Nov 17, 2008SaveLearn
Scale-dependent bias induced by local non-Gaussianity: A comparison to N-body simulationsWe investigate the effect of primordial non-Gaussianity of the local fNL type on the auto- and cross-power spectrum of dark matter haloes using simulations of the LCDM cosmology. We perform a series…Vincent Desjacques, Uros Seljak, Ilian T. Iliev·Nov 17, 2008SaveLearn
Episodic Magnetic Bubbles and Jets: Astrophysical Implications from Laboratory ExperimentsCollimated outflows (jets) are ubiquitous in the universe appearing around sources as diverse as protostars and extragalactic supermassive blackholes. Jets are thought to be magnetically collimated,…Andrea Ciardi, Sergey V. Lebedev, Adam Frank et al.·Nov 17, 2008SaveLearn
Kolmogorov cosmic microwave background skyA new map of the sky representing the degree of randomness in the cosmic microwave background (CMB) temperature has been obtained. The map based on estimation of the Kolmogorov stochasticity…V. G. Gurzadyan, A. E. Allahverdyan, T. Ghahramanyan et al.·Nov 17, 2008SaveLearn
A Resolved Ring of Debris Dust Around the Solar Analog HD 107146We present resolved images of the dust continuum emission from the debris disk around the young (80-200 Myr) solar-type star HD 107146 with CARMA at λ1.3 mm and the CSO at λ350 μm. Both images…S. A. Corder, J. M. Carpenter, A. I. Sargent et al.·Nov 17, 2008SaveLearn
Mars Before the Space AgeMars has surely been scrutinised since the dawn of humankind. In the 16th century Tycho Brahe made accurate observations of the position of Mars that enabled Johannes Kepler to obtain his first two…Barrie W Jones·Nov 17, 2008SaveLearn
RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937: Long-Term Variability and the 2007 March EventAfter three years of no unusual activity, Anomalous X-ray Pulsar 1E 1048.1-5937 reactivated in 2007 March. We report on the detection of a large glitch (Delta(nu)/nu =1.63(2)X~10-5) on 2007 March…Rim Dib, Victoria M. Kaspi, Fotis P. Gavriil·Nov 17, 2008SaveLearn
Memory effects in turbulent transportIn the mean-field theory of magnetic fields, turbulent transport, i.e. the turbulent electromotive force, is described by a combination of the alpha effect and turbulent magnetic diffusion, which are…Alexander Hubbard, Axel Brandenburg·Nov 17, 2008SaveLearn
Fundamental vibrational mode in a highly inhomogeneous starThe eigenfrequency problem of fundamental vibrational mode in a highly inhomogeneous star, modeled by self-gravitating mass of viscous liquid with singular density at the center, is considered in…S. I. Bastrukov, H. -K. Chang, E. -H. Wu et al.·Nov 17, 2008SaveLearn
Cosmological parameters after WMAP5: forecasts for Planck and future galaxy surveysThe Planck satellite is expected to improve the measurement of most cosmological parameters by several factors with respect to current WMAP results. The actual performance may depend upon various…L. P. L. Colombo, E. Pierpaoli, J. R. Pritchard·Nov 17, 2008SaveLearn
Turbulence-Flame Interactions in Type Ia SupernovaeThe large range of time and length scales involved in type Ia supernovae (SN Ia) requires the use of flame models. As a prelude to exploring various options for flame models, we consider, in this…A. J. Aspden, J. B. Bell, M. S. Day et al.·Nov 17, 2008SaveLearn
MgII absorption systems and their neighbouring galaxies from a background subtraction techniqueWe estimate the absolute magnitude distribution of galaxies which lie within about a Mpc of Mg II absorption systems. The absorption systems themselves lie along 1880 lines of sight to QSOs from the…Michelle Caler, Ravi Sheth, Bhuvnesh Jain·Nov 17, 2008SaveLearn
Chi-square and Poissonian Data: Biases Even in the High-Count Regime and How to Avoid themWe demonstrate that two approximations to the chi2 statistic as popularly employed by observational astronomers for fitting Poisson-distributed data can give rise to intrinsically biased model…Philip J. Humphrey, Wenhao Liu, David A. Buote·Nov 17, 2008SaveLearn
The Expected Detection of Dust Emission from High-Redshift Lyman Alpha GalaxiesRecent results have shown that a substantial fraction of high-redshift Lyman alpha galaxies contain considerable amounts of dust. This implies that Lyman alpha galaxies are not primordial, as has…Steven Finkelstein, Sangeeta Malhotra, James Rhoads et al.·Nov 17, 2008SaveLearn