More on Lensing by a Cosmological ConstantThe question of whether or not the cosmological constant affects the bending of light around a concentrated mass has been the subject of some recent papers. We present here a simple, specific and…Mustapha Ishak, Wolfgang Rindler, Jason Dossett·Oct 28, 2008SaveLearn
Three-wave interactions of dispersive plasma waves propagating parallel to the magnetic fieldThree-wave interactions of plasma waves propagating parallel to the mean magnetic field at frequencies below the electron cyclotron frequency are considered. We consider Alfvén--ion-cyclotron waves,…F. Spanier, R. Vainio·Oct 28, 2008SaveLearn
Disentangling the Nature of the Radio Emission in Wolf Rayet StarsWe present quasi-simultaneous, multi-frequency VLA observations at 4.8, 8.4, and 22.5 GHz, of a sample of 13 Wolf Rayet (WR) stars, aimed at disentangling the nature of their radio emission and the…Gabriela Montes, Miguel A. Perez-Torres, Antxon Alberdi et al.·Oct 28, 2008SaveLearn
Constraints on Neutrino Masses from Weak LensingThe weak lensing (WL) distortions of distant galaxy images are sensitive to neutrino masses by probing the suppression effect on clustering strengths of total matter in large-scale structure. We use…Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi·Oct 28, 2008SaveLearn
Supersonic Cloud Collision - IIt has long been suggested that shocks might play an important role in altering the form of the interstellar medium (ISM). Shocks enhance gas density and sufficiently dense regions may become self…S. V. Anathpindika·Oct 28, 2008SaveLearn
A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiationA new measurement of the cosmic ray antiproton-to-proton flux ratio between 1 and 100 GeV is presented. The results were obtained with the PAMELA experiment, which was launched into low-earth orbit…O. Adriani, G. C. Barbarino, G. A. Bazilevskaya et al.·Oct 28, 2008SaveLearn
The Impact of Feedback on Disk Galaxy Scaling RelationsWe use a disk galaxy evolution model to investigate the impact of mass outflows (a.k.a. feedback) on disk galaxy scaling relations. Our model follows the accretion, cooling, star formation and…Aaron A. Dutton, Frank C. van den Bosch·Oct 28, 2008SaveLearn
Anatomy of the Bar Instability in Cuspy Dark Matter HalosWe examine the bar instability in galactic models with an exponential disk and a cuspy dark matter (DM) halo with a Navarro-Frenk-White (NFW) cosmological density profile. We construct equilibrium…John Dubinski, Ingo Berentzen, Isaac Shlosman·Oct 28, 2008SaveLearn
Time Variability of Quasars: the Structure Function VarianceSignificant progress in the description of quasar variability has been recently made by employing SDSS and POSS data. Common to most studies is a fundamental assumption that photometric observations…C. MacLeod, Z. Ivezic, W. de Vries et al.·Oct 28, 2008SaveLearn
Parametrization and Classification of 20 Billion LSST Objects: Lessons from SDSSThe Large Synoptic Survey Telescope (LSST) will be a large, wide-field ground-based system designed to obtain, starting in 2015, multiple images of the sky that is visible from Cerro Pachon in…Z. Ivezic, T. Axelrod, A. C. Becker·Oct 28, 2008SaveLearn
Evolution of Magnetic Fields in Supernova RemnantsSupernova remnants (SNR) are now widely believed to be a source of cosmic rays (CRs) up to an energy of 1 PeV. The magnetic fields required to accelerate CRs to sufficiently high energies need to be…K. M. Schure, J. Vink, A. Achterberg et al.·Oct 28, 2008SaveLearn
Mixing in Zero and Solar Metallicity SupernovaeTwo-dimensional simulations of mixing and fall back in non-rotating massive stars have been carried out using realistic initial models for the presupernova star and assuming standard spherically…C. C. Joggerst, S. E. Woosley, Alexander Heger·Oct 28, 2008SaveLearn
Evidence for Magnetic Flux Saturation in Rapidly Rotating M StarsWe present magnetic flux measurements in seven rapidly rotating M dwarfs. Our sample stars have X-ray and H-alpha emission indicative of saturated emission, i.e., emission at a high level independent…A. Reiners, G. Basri, M. Browning·Oct 28, 2008SaveLearn
Target star catalog for Darwin: Nearby Stellar sample for a search for terrestrial planetsIn order to evaluate and develop mission concepts for a search for Terrestrial Exoplanets, we have prepared a list of potential target systems. In this paper we present and discuss the criteria for…L. Kaltenegger, C. Eiroa, C. V. M. Fridlund·Oct 28, 2008SaveLearn
HI Structure Observations of Reionization and Dark EnergyThis proceeding concentrates on the BAO signature of dark energy, and how the SKA dark energy case has been complicated by the emergence of HI structure experiments modeled after the Epoch of…Miguel F. Morales·Oct 28, 2008SaveLearn
A Major X-ray Outburst from an Ultraluminous X-Ray Source in M82We detected a major X-ray outburst from M82 with a duration of 79 days, an average flux of 5E-11 erg cm-2 s-1 in the 2-10 keV band, and strong variability. The X-ray spectrum remained hard…Philip Kaaret, Hua Feng, Mark Gorski·Oct 28, 2008SaveLearn
Dwarf Galaxy Starburst Statistics in the Local VolumeAn unresolved question in galaxy evolution is whether the star formation histories of low mass systems are preferentially dominated by starbursts or modes that are more quiescent and continuous.…Janice C. Lee, Robert C. Kennicutt, José G. Funes S. J. et al.·Oct 28, 2008SaveLearn
High-Velocity Clouds in the Nearby Spiral Galaxy M 83We present deep HI 21-cm and optical observations of the face-on spiral galaxy M 83 obtained as part of a project to search for high-velocity clouds (HVCs) in nearby galaxies. Anomalous-velocity…Eric D. Miller, Joel N. Bregman, Bart P. Wakker·Oct 28, 2008SaveLearn
Absolute dimensions of the F-type eclipsing binary star VZ CepheiWe present new V-band differential photometry and radial-velocity measurements of the unevolved 1.18-day period F+G-type double-lined eclipsing binary VZ Cep. We determine accurate values for the…Guillermo Torres, Claud H. Sandberg Lacy·Oct 28, 2008SaveLearn
Constraining the NFW Potential with Observations and Modeling of LSB Galaxy Velocity FieldsWe model the NFW potential to determine if, and under what conditions, the NFW halo appears consistent with the observed velocity fields of low surface brightness (LSB) galaxies. We present mock…Rachel Kuzio de Naray, Stacy S. McGaugh, J. Christopher Mihos·Oct 28, 2008SaveLearn
The Monitor project: Rotation periods of low-mass stars in M50We report on the results of a time-series photometric survey of M50 (NGC 2323), a ~130 Myr open cluster, carried out using the CTIO 4m Blanco telescope and Mosaic-II detector as part of the Monitor…Jonathan Irwin, Suzanne Aigrain, Jerome Bouvier et al.·Oct 28, 2008SaveLearn
Software Holography: Interferometric Data Analysis for the Challenges of Next Generation ObservatoriesNext generation radio observatories such as the MWA, LWA, LOFAR, CARMA and SKA provide a number of challenges for interferometric data analysis. These challenges include heterogeneous arrays,…Miguel F. Morales, Michael Matejek·Oct 28, 2008SaveLearn
Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrumType Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of…Oliver Krause, Masaomi Tanaka, Tomonori Usuda et al.·Oct 28, 2008SaveLearn
High-order 3D Voronoi tessellation for identifying Isolated galaxies, Pairs and TripletsGeometric method based on the high-order 3D Voronoi tessellation is proposed for identifying the single galaxies, pairs and triplets. This approach allows to select small galaxy groups and isolated…A. Elyiv, O. Melnyk, I. Vavilova·Oct 28, 2008SaveLearn
Mid-infrared VISIR and Spitzer observations of the surroundings of the magnetar SGR 1806-20We report mid-infrared observations of SGR 1806-20 and its environment - with the highest spatial resolution in this domain to date - using ESO/VISIR in 2005 and 2006, and we retrieved…F. Rahoui, S. Chaty, P. O. Lagage·Oct 28, 2008SaveLearn