The formation of the first galaxies and the transition to low-mass star formationThe formation of the first galaxies at redshifts z ~ 10-15 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here review recent progress…Thomas H. Greif, Dominik R. G. Schleicher, Jarrett L. Johnson et al.·Aug 12, 2008SaveLearn
Slow-Roll Suppression of Adiabatic Instabilities in Coupled Scalar Field-Dark Matter ModelsWe study the evolution of linear density perturbations in the context of interacting scalar field-dark matter cosmologies, where the presence of the coupling acts as a stabilization mechanism for the…Pier Stefano Corasaniti·Aug 12, 2008SaveLearn
Gamma-Ray Emission from the Broad-Line Radio Galaxy 3C111The broad-line radio galaxy 3C111 has been suggested as the counterpart of the gamma-ray source 3EGJ0416+3650. While 3C111 meets most of the criteria for a high-probability identification, like a…R. C. Hartman, M. Kadler, J. Tueller·Aug 12, 2008SaveLearn
Mapping low-latitude stellar substructure with SEGUE photometryEncircling the Milky Way at low latitudes, the Low Latitude Stream is a large stellar structure, the origin of which is as yet unknown. As part of the SEGUE survey, several photometric scans have…Jelte T. A. de Jong, Brian Yanny, Hans-Walter Rix et al.·Aug 12, 2008SaveLearn
The Properties of Long-Period Variables in the Large Magellanic Cloud from MACHOWe present a new analysis of the long-period variables in the Large Magellanic Cloud (LMC) from the MACHO Variable Star Catalog. Three-quarters of our sample of evolved, variable stars have periodic…Oliver J. Fraser, Suzanne L. Hawley, Kem H. Cook·Aug 12, 2008SaveLearn
A Tale of Two Herbig Ae stars -MWC275 and AB Aurigae: Comprehensive Models for SED and InterferometryWe present comprehensive models for the Herbig Ae stars MWC275 and AB Aur that aim to explain their spectral energy distribution (from UV to millimeter) and long baseline interferometry (from…A. Tannirkulam, J. D. Monnier, T. J. Harries et al.·Aug 12, 2008SaveLearn
X-Ray Emission from a Supermassive Black Hole Ejected from the Center of a GalaxyRecent studies have indicated that the emission of gravitational waves at the merger of two black holes gives a kick to the final black hole. If the supermassive black hole at the center of a disk…Yutaka Fujita·Aug 12, 2008SaveLearn
Broadband Radiation from Primary Electrons in Very Energetic SupernovaeA class of very energetic supernovae (hypernovae) is associated with long gamma-ray bursts, in particular with a less energetic but more frequent population of gamma-ray bursts. Hypernovae also…Shin'ichiro Ando, Peter Meszaros·Aug 12, 2008SaveLearn
A Probable New Globular Cluster in the Galactic DiskWe report the discovery of a probable new globular cluster in the disk of the Milky Way. Visible in 2MASS and the GLIMPSE survey, it has an estimated foreground extinction of AV ~ 24 mag. The…Jay Strader, Henry A. Kobulnicky·Aug 12, 2008SaveLearn
Measurements of cosmic-ray secondary nuclei at high energies with the first flight of the CREAM balloon-borne experimentWe present new measurements of heavy cosmic-ray nuclei at high energies per- formed during the first flight of the balloon-borne cosmic-ray experiment CREAM (Cosmic-Ray Energetics And Mass). This…H. S. Ahn, P. S. Allison, M. G. Bagliesi et al.·Aug 12, 2008SaveLearn
Rapidly Rotating Suns and Active Nests of ConvectionIn the solar convection zone, rotation couples with intensely turbulent convection to drive a strong differential rotation and achieve complex magnetic dynamo action. Our sun must have rotated more…Benjamin P. Brown, Matthew K. Browning, Allan Sacha Brun et al.·Aug 12, 2008SaveLearn
Planetary Bow ShocksOur present knowledge of the properties of the various planetary bow shocks is briefly reviewed. We do not follow the astronomical ordering of the planets. We rather distinguish between magnetised…R. A. Treumann, C. H. Jaroschek·Aug 12, 2008SaveLearn
Warped polar ring in the Arp 212 galaxyThe Fabry-Perot scanning interferometer mounted on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences is used to study the distribution and kinematics of…A. V. Moiseev·Aug 12, 2008SaveLearn
Reliability of P mode event classification using contemporaneous BiSON and GOLF observationsWe carried out a comparison of the signals seen in contemporaneous BiSON and GOLF data sets. Both instruments perform Doppler shift velocity measurements in integrated sunlight, although BiSON…R. Simoniello, W. J. Chaplin, Y. P. Elsworth et al.·Aug 12, 2008SaveLearn
Energy spectrum of ultra high energy cosmic raysThe construction of the southern site of the Pierre Auger Observatory is almost completed. Three independent measurements of the flux of the cosmic rays with energies larger than 1 EeV have been…Ioana C. Maris·Aug 12, 2008SaveLearn
Quark stars: their influence on Astroparticle PhysicsWe discuss some of the recent developments in the quark star physics along with the consequences of possible hadron to quark phase transition at high density scenario of neutron stars and their…Sanjay K. Ghosh·Aug 12, 2008SaveLearn
Near-infrared wavefront sensing for the VLT interferometerThe very large telescope (VLT) interferometer (VLTI) in its current operating state is equipped with high-order adaptive optics (MACAO) working in the visible spectrum. A low-order near-infrared…Stefan Hippler, Wolfgang Brandner, Yann Clénet et al.·Aug 12, 2008SaveLearn
A new equation for the mid-plane potential of power law discs. II. Exact solutions and approximate formulaeThe first-order ordinary differential equation (ODE) that describes the mid-plane gravitational potential in flat finite size discs in which the surface density is a power-law function of the radius…J. -M. Huré, F. Hersant, C. Carreau et al.·Aug 12, 2008SaveLearn
Proper motions of field L and T dwarfs -IIBy using images taken with WFCAM on UKIRT and SofI on the NTT and combining them with 2MASS we have measured proper motions for 126 L and T dwarfs in the dwarf archive. Two of these L dwarfs appear…S. L. Casewell, R. F. Jameson, M. R. Burleigh·Aug 12, 2008SaveLearn
Filaments in Galactic Winds Driven by Young Stellar ClustersThe starburst galaxy M82 shows a system of Hα-emitting filaments which extend to each side of the galactic disk. We model these filaments as the result of the interaction between the winds from a…Ary Rodriguez-Gonzalez, Alejandro Esquivel, Pablo Velazquez et al.·Aug 12, 2008SaveLearn
Precision Southern Hemisphere pulsar VLBI astrometry: techniques and results for PSR J1559-4438We describe a data reduction pipeline for VLBI astrometric observations of pulsars, implemented using the ParselTongue AIPS interface. The pipeline performs calibration (including ionosphere…A. T. Deller, S. J. Tingay, W. Brisken·Aug 12, 2008SaveLearn
Extremely high precision VLBI astrometry of PSR J0437-4715 and implications for theories of gravityUsing the recently upgraded Long Baseline Array, we have measured the trigonometric parallax of PSR J0437-4715 to better than 1% precision, the most precise pulsar distance determination made to…A. T. Deller, J. P. W. Verbiest, S. J. Tingay et al.·Aug 12, 2008SaveLearn
High-energy Particle Acceleration and Production of Ultra-high-energy Cosmic Rays in the Giant Lobes of Centaurus AThe nearby radio galaxy Centaurus A is poorly studied at high frequencies with conventional radio telescopes because of its very large angular size, but is one of a very few extragalactic objects to…M. J. Hardcastle, C. C. Cheung, I. J. Feain et al.·Aug 11, 2008SaveLearn
Circles-in-the-sky searches and observable cosmic topology in the inflationary limitWhile the topology of the Universe is at present not specified by any known fundamental theory, it may in principle be determined through observations. In particular, a non-trivial topology will…B. Mota, M. J. Reboucas, R. Tavakol·Aug 11, 2008SaveLearn
The Evolution of Late-Time Optical Emission From SN 1979COptical spectra of the bright Type II-L supernova SN 1979C obtained in April 2008 with the 6.5 m MMT telescope are compared with archival late-time spectra to follow the evolution of its optical…D. Milisavljevic, R. Fesen, R. Kirshner et al.·Aug 11, 2008SaveLearn