Monte Carlo discretization of general relativistic radiation transportAn indirect, hybrid Monte Carlo discretization of general relativistic kinetic theory suitable for the development of numerical schemes for radiation transport is presented. The discretization is…Burkhard Zink·Oct 29, 2008SaveLearn
The evolution of two stellar populations in globular clusters I. The dynamical mixing timescaleWe investigate the long-term dynamical evolution of two distinct stellar populations of low-mass stars in globular clusters in order to study whether the energy equipartition process can explain the…T. Decressin, H. Baumgardt, P. Kroupa·Oct 29, 2008SaveLearn
The role of luminous substructure in the gravitational lens system MG 2016+112MG 2016+112 is a quadruply imaged lens system with two complete images A and B and a pair of merging partial images in region C as seen in the radio. The merging images are found to violate the…A. More, J. P. McKean, S. More et al.·Oct 29, 2008SaveLearn
Spectral and temporal variations of the isolated neutron star RX J0720.4-3125: new XMM-Newton observationsIn the past, the isolated, radio-quiet neutron star RX J0720.4-3125 showed variations in the spectral parameters (apparent radius, temperature of the emitting area and equivalent width of the…M. M. Hohle, F. Haberl, J. Vink et al.·Oct 29, 2008SaveLearn
Post-starburst galaxies: more than just an interesting curiosityFrom the VIMOS VLT DEEP Survey (VVDS) we select a sample of 16 galaxies with spectra which identify them as having recently undergone a strong starburst and subsequent fast quenching of star…Vivienne Wild, C. Jakob Walcher, Peter H. Johansson et al.·Oct 29, 2008SaveLearn
Modell zur Entstehung eines Rings aus Dunkler Materie in der MilchstraßenebeneBoth the distribution of hydrogen and the rotation curve of the Milky Way indicate the existence of a ring of Cold Dark Matter in the galactic plane with a radius of 14 kiloparsecs around the…Raphaël Errani·Oct 29, 2008SaveLearn
Orbital Evolution of a Particle Interacting with a Single Planet in a Protoplanetary DiskWe investigate the motion of a particle around a low mass planet embedded in a non-turbulent gaseous disk. We take into account the effect of the gas structure that is modified by the gravitational…Takayuki Muto, Shu-ichiro Inutsuka·Oct 29, 2008SaveLearn
Constraints on WIMP Dark Matter from the High Energy PAMELA p/p dataA new calculation of the p/p ratio in cosmic rays is compared to the recent PAMELA data. The good match up to 100 GeV allows to set constraints on exotic contributions from thermal WIMP dark…F. Donato, D. Maurin, P. Brun et al.·Oct 29, 2008SaveLearn
Perspective of Galactic dark matter subhalo detection on Fermi from the EGRET observationThe perspective of the detectability of Galactic dark matter subhaloes on the Fermi satellite is investigated in this work. Under the assumptions that dark matter annihilation accounts for the…Qiang Yuan, Xiao-Jun Bi, Juan Zhang·Oct 29, 2008SaveLearn
Photometric constraints on white dwarfs and the identification of extreme objectsIt is possible to reliably identify white dwarfs (WDs) without recourse to spectra, instead using photometric and astrometric measurements to distinguish them from Main Sequence stars and quasars.…Daniel J. Mortlock, Hiranya V. Peiris, Zeljko Ivezic·Oct 29, 2008SaveLearn
Mergers of luminous early-type galaxies in the local universe and gravitational wave backgroundSupermassive black hole (SMBH) coalescence in galaxy mergers is believed to be one of the primary sources of very low frequency gravitational waves (GWs). Significant contribution of the GWs comes…Z. L. Wen, F. S. Liu, J. L. Han·Oct 29, 2008SaveLearn
Dissipation Efficiency in Turbulent Convective Zones in Low Mass StarsWe extend the analysis of Penev et al. (2007) to calculate effective viscosities for the surface convective zones of three main sequence stars of 0.775Msun, 0.85Msun and the present day Sun. In…Kaloyan Penev, Dimitar Sasselov, Frank Robinson et al.·Oct 29, 2008SaveLearn
Interferometric Studies of the extreme binary, ε Aurigae: Pre-eclipse ObservationsWe report new and archival K-band interferometric uniform disk diameters obtained with the Palomar Testbed Interferometer for the eclipsing binary star ε Aurigae, in advance of the start of its…R. Stencel, M. Creech-Eakman, A. Hart et al.·Oct 29, 2008SaveLearn
Star formation triggered by SNR impact into magnetized neutral cloudsConsidering the physical conditions that are relevant for triggering star formation in interactions involving SN shocks and neutral clouds, we have built diagrams of the SNR radius versus the cloud…M. R. M. Leao, E. M. de Gouveia Dal Pino, D. Falceta-Goncalves et al.·Oct 29, 2008SaveLearn
Collisional heating as the origin of filament emission in galaxy clusters[Abridged] Photoionization, whether by starlight or other sources, has difficulty in accounting for the observed spectra of the optical filaments that often surround central galaxies in large…G. J. Ferland, A. C. Fabian, N. A. Hatch et al.·Oct 29, 2008SaveLearn
Probing the Nature of the Vela X CocoonVela X is a pulsar wind nebula (PWN) associated with the active pulsar B0833-45 and contained within the Vela supernova remnant (SNR). A collimated X-ray filament ("cocoon") extends…Stephanie M. LaMassa, Patrick O. Slane, Okkie C. de Jager·Oct 29, 2008SaveLearn
Photometric and Kinematic Characterization of Tidal Dwarf Galaxy candidatesTidal Dwarf Galaxies (TDG), or self-graviting objects created from the tidal forces in interacting galaxies, have been found in several merging systems. This work will focus on identifying TDG…D. Miralles-Caballero, L. Colina, S. Arribas·Oct 29, 2008SaveLearn
Low Mass Companions for Five Solar-Type Stars from the Magellan Planet Search ProgramWe report low mass companions orbiting five Solar-type stars that have emerged from the Magellan precision Doppler velocity survey, with minimum (Msini) masses ranging from 1.2 to 25 Mjup. These…Dante Minniti, R. Paul Butler, Mercedes Lopez-Morales et al.·Oct 29, 2008SaveLearn
On The Use of Absorption Cells as a Wavelength Reference for Precision Radial Velocity Measurements in the Near InfraredConsiderable interest is now focused on the detection of terrestrial mass planets around M dwarfs, and radial velocity surveys with high-resolution spectrographs in the near infrared are expected to…Suvrath Mahadevan, Jian Ge·Oct 29, 2008SaveLearn
Spectroscopic analysis of DA white dwarfs from the McCook & Sion catalogFor some years now, we have been gathering optical spectra of DA white dwarfs in an effort to study and define the empirical ZZ Ceti instability strip. However, we have recently expanded this survey…A. Gianninas, P. Bergeron, M. T. Ruiz·Oct 29, 2008SaveLearn
The stellar association around Gamma Velorum and its relationship with Vela OB2We present the results of a photometric BVI survey of 0.9 square degrees around the Wolf-Rayet binary gamma2 Vel and its early-type companion gamma1 Vel. Several hundred PMS stars are identified…R. D Jeffries, Tim Naylor, F. M. Walter et al.·Oct 29, 2008SaveLearn
Static Pressure of Hot Gas: Its Effect on the Gas Disks of GalaxiesThe static pressure of the hot gas that fills clusters and groups of galaxies can affect significantly the volume density and thickness of the gas disks in galaxies. In combination with the dynamic…Anatoly V. Zasov, Alexander V. Khoperskov·Oct 29, 2008SaveLearn
High-Resolution X-ray Spectroscopy of SNR 1987A: Chandra LETG and HETG Observations in 2007We present an extended analysis of the deep Chandra LETG and HETG observations of the supernova remnant 1987A (SNR 1987A) carried out in 2007. The global fits to the grating spectra show that the…Svetozar A. Zhekov, Richard McCray, Daniel Dewey et al.·Oct 29, 2008SaveLearn
Super-Orbital Variability in Hard X-raysWe present the results of a study with the Swift Burst Alert Telescope in the 14 -- 195 keV range of the long-term variability of 5 low mass X-ray binaries with reported or suspected…S. A. Farrell, D. Barret, G. K. Skinner·Oct 29, 2008SaveLearn
Three-Layer MagnetoconvectionIt is believed that some stars have two or more convection zones in close proximity near to the stellar photosphere. These zones are separated by convectively stable regions that are relatively…M. -K. Lin, L. J. Silvers, M. R. E. Proctor·Oct 29, 2008SaveLearn