Evolution of Dark Matter Phase-Space Density Distributions in Equal-Mass Halo MergersWe use dissipationless N-body simulations to investigate the evolution of the true coarse-grained phase-space density distribution f(x,v) in equal-mass mergers between dark matter (DM) halos. The…Ileana M. Vass, Stelios Kazantzidis, Monica Valluri et al.·Dec 19, 2008SaveLearn
Gamma-ray and Radio Constraints of High Positron Rate Dark Matter Models Annihilating into New Light ParticlesThe possibility of explaining the positron and electron excess recently found by the PAMELA and ATIC collaborations in terms of dark matter (DM) annihilation has attracted considerable attention.…Lars Bergstrom, Gianfranco Bertone, Torsten Bringmann et al.·Dec 19, 2008SaveLearn
Maxwell-Kostelecký Electromagnetism and Cosmic MagnetizationThe Lorentz violating term in the photon sector of Standard Model Extension, LK = -14 (kF)αβμν Fαβ Fμν (here referred to as the Kostelecký term), breaks conformal…L. Campanelli, P. Cea·Dec 19, 2008SaveLearn
The nature of red dwarf galaxiesUsing dark matter halos traced by galaxy groups selected from the Sloan Digital Sky Survey Data Release 4, we find that about 1/4 of the faint galaxies ( >-17.05, hereafter dwarfs) that are…Yu Wang, Xiaohu Yang, H. J. Mo et al.·Dec 19, 2008SaveLearn
Formation of Galactic Center Magnetic LoopsA survey for the molecular clouds in the Galaxy with NANTEN mm telescope has discovered molecular loops in the Galactic center region. The loops show monotonic gradients of the line of sight velocity…Mami Machida, Ryoji Matsumoto, Satoshi Nozawa et al.·Dec 19, 2008SaveLearn
Universality in oscillation modes of superfluid neutron stars?It has been well established that the f-mode of relativistic ordinary-fluid neutron stars displays a universal scaling behavior. Here we study whether the "ordinary" f o- and…K. S. Wong, L. M. Lin, P. T. Leung·Dec 19, 2008SaveLearn
Five ideas on black hole accretion disksI review five of Bohdan Paczynski's ideas on black hole accretion disk theory. They formed my understanding of the subject and often guided intuition in my research. They are fundamentally…Marek A. Abramowicz·Dec 19, 2008SaveLearn
Quantum Uncertainty Considerations for Gravitational Lens InterferometryThe measurement of the gravitational lens delay time between light paths has relied, to date, on the source having sufficient variability to allow photometric variations from each path to be…Laurance R. Doyle, David P. Carico·Dec 19, 2008SaveLearn
Aspherical Core-Collapse Supernovae in Red Supergiants Powered by Nonrelativistic JetsWe explore the observational characteristics of jet-driven supernovae by simulating bipolar-jet-driven explosions in a red supergiant progenitor. We present results of four models in which we hold…Sean M. Couch, J. Craig Wheeler, Milos Milosavljevic·Dec 19, 2008SaveLearn
On the release of binding energy and accretion power in core collapse-like environmentsAll accretion models of gamma-ray bursts share a common assumption: accretion power and gravitational binding energy is released and then dissipated locally, with the mass of its origin. This is…Aristotle Socrates, Enrico Ramirez-Ruiz·Dec 19, 2008SaveLearn
An Accelerating Cosmology Without Dark EnergyThe negative pressure accompanying gravitationally-induced particle creation can lead to a cold dark matter (CDM) dominated, accelerating Universe (Lima et al. 1996) without requiring the presence of…G. Steigman, R. C. Santos, J. A. S. Lima·Dec 19, 2008SaveLearn
Coronal activity from the ASAS eclipsing binariesWe combine the catalogue of eclipsing binaries from the All Sky Automated Survey (ASAS) with the ROSAT All Sky Survey (RASS). The combination results in 836 eclipsing binaries that display coronal…D. M. Szczygiel, A. Socrates, B. Paczynski et al.·Dec 19, 2008SaveLearn
Cosmic ray driven dynamo in galactic disks. A parameter studyWe present a parameter study of the magnetohydrodynamical dynamo driven by cosmic rays in the interstellar medium (ISM) focusing on the efficiency of magnetic field amplification and the issue of…Michał Hanasz, Katarzyna Otmianowska-Mazur, Grzegorz Kowal et al.·Dec 19, 2008SaveLearn
Unveiling the birth and evolution of the HII region Sh2-173Based on a multiwavelength study, the ISM around the HII region Sh2-173 has been analyzed. The ionized region is clearly detected in the optical and in the radio continuum images. The analysis of the…S. Cichowolski, G. A. Romero, M. E. Ortega et al.·Dec 19, 2008SaveLearn
Accelerated expansion and matter creationA set of cosmological models that takes into account the variation of the particle number is presented. In this context both dark matter and dark energy can be explained using a single component,…Victor H. Cardenas·Dec 19, 2008SaveLearn
Gravitational lensing of stars orbiting the Massive Black Hole in the Galactic CenterThe existence of a massive black hole in the center of the Milky Way, coinciding with the radio source Sgr A*, is being established on more and more solid ground. In principle, this black hole,…Valerio Bozza, Luigi Mancini·Dec 19, 2008SaveLearn
Large grains in disks around young stars: ATCA observations of WW Cha, RU Lup, and CS ChaGrains in disks around young stars grow from interstellar submicron sizes to planetesimals over the course of several Myr. Thermal emission of large grains or pebbles can be best observed at cm…Dave Lommen, Sarah Maddison, Chris Wright et al.·Dec 19, 2008SaveLearn
Updated Pre-Main Sequence tracks at low metallicities for 0.1< M/Mo<1.5Young populations at Z<Zo are being examined to understand the role of metallicity in the first phases of stellar evolution. For the analysis it is necessary to assign mass and age to Pre--Main…Di Criscienzo, P. Ventura, F. D'Antona·Dec 19, 2008SaveLearn
A Comparison of Six Photometric Redshift Methods Applied to 1.5 Million Luminous Red GalaxiesWe present an updated version of MegaZ-LRG (Collister et al.,(2007)) with photometric redshifts derived with the neural network method, ANNz as well as five other publicly available photo-z codes…Filipe B. Abdalla, Manda Banerji, Ofer Lahav et al.·Dec 19, 2008SaveLearn
Evidence for a hard equation of state in the cores of neutron starsThe equation of state for matter with energy density above 2 x1014 g/cm3 is parametrized by P = kNGamma, where N is the number density, Gamma is the adiabatic index, and k a constant. Using this…Chris Vuille·Dec 19, 2008SaveLearn
Long-term chromospheric activity of non-eclipsing RS CVn-type starsContext. The IUE database provides a large number of UV high and low-resolution spectra of RS CVn-type stars from 1978 to 1996. In particular, many of these stars were monitored continuously during…Andrea P. Buccino, Pablo J. D. Mauas·Dec 19, 2008SaveLearn
The solar wind charge-transfer X-ray emission in the 1/4 keV energy range: inferences on Local Bubble hot gas at low ZWe present calculations of the heliospheric SWCX emission spectra and their contributions in the ROSAT 1/4 keV band. We compare our results with the soft X-ray diffuse background (SXRB) emission…D. Koutroumpa, R. Lallement, J. C. Raymond et al.·Dec 19, 2008SaveLearn
Discovery of fossil magnetic fields in the intermediate-mass pre-main sequence starsIt is now well-known that the surface magnetic fields observed in cool, lower-mass stars on the main sequence (MS) are generated by dynamos operating in their convective envelopes. However,…E. Alecian, G. A. Wade, C. Catala·Dec 19, 2008SaveLearn
Power Asymmetry in Cosmic Microwave Background Fluctuations from Full Sky to Sub-degree Scales: Is the Universe Isotropic?We repeat and extend the analysis of Eriksen et al 2004 and Hansen et al 2004 testing the isotropy of the Cosmic Microwave Background (CMB) fluctuations. We find that the hemispherical power…F. K. Hansen, A. J. Banday, K. M. Gorski et al.·Dec 19, 2008SaveLearn
Liquid metal experiments on the helical magnetorotational instabilityThe magnetorotational instability (MRI) plays an essential role in the formation of stars and black holes. By destabilizing hydrodynamically stable Keplerian flows, the MRI triggers turbulence and…Frank Stefani, Gunter Gerbeth, Thomas Gundrum et al.·Dec 19, 2008SaveLearn