Nucleosynthetic osmium isotope anomalies in acid leachates of the Murchison meteoriteWe present osmium isotopic results obtained by sequential leaching of the Murchison meteorite, which reveal the existence of very large internal anomalies of nucleosynthetic origin. The Os isotopic…L. Reisberg, N. Dauphas, A. Luguet et al.·Dec 15, 2008SaveLearn
RAPID: A fast, high resolution, flux-conservative algorithm designed for planet-disk interactionsWe describe a newly developed hydrodynamic code for studying accretion disk processes. The numerical method uses a finite volume, nonlinear, Total Variation Diminishing (TVD) scheme to capture shocks…L. R. Mudryk, N. W. Murray·Dec 15, 2008SaveLearn
Radio Signal by Galactic Dark MatterAn interesting strategy for indirect detection of Dark Matter comes through the amounts of electrons and positrons usually emitted by DM pair annihilation. The e+e- gyrating in the galactic magnetic…Enrico Borriello, Alessandro Cuoco, Gennaro Miele·Dec 15, 2008SaveLearn
On the Nature of Fossil Galaxy Groups: Are they really fossils ?We use SDSS-DR4 photometric and spectroscopic data out to redshift z~0.1 combined with ROSAT All Sky Survey X-ray data to produce a sample of twenty-five fossil groups (FGs), defined as bound systems…F. La Barbera, R. R. de Carvalho, I. G. de la Rosa et al.·Dec 15, 2008SaveLearn
Environmental Effects in Clusters: Modified Far-Infrared--Radio Relations within Virgo Cluster Galaxies(abridged) We present a study on the effects of the intracluster medium (ICM) on the interstellar medium (ISM) of 10 Virgo cluster spiral galaxies using Spitzer far-infrared (FIR) and VLA radio…E. J. Murphy, J. D. P. Kenney, G. Helou et al.·Dec 15, 2008SaveLearn
Gravity Waves from Tachyonic Preheating after Hybrid InflationWe study the stochastic background of gravitational waves produced from preheating in hybrid inflation models. We investigate different dynamical regimes of preheating in these models and we compute…Jean Francois Dufaux, Gary N. Felder, Lev Kofman et al.·Dec 15, 2008SaveLearn
A Characteristic Division Between the Fueling of Quasars and Seyferts: Five Simple TestsGiven the existence of the MBH-sigma relation, models of self-regulated black hole (BH) growth require both a fuel supply and growth of the host bulge to deepen the potential, or else the system…Philip F. Hopkins, Lars Hernquist·Dec 15, 2008SaveLearn
The ages of Galactic globular clusters in the context of self-enrichmentA significant fraction of stars in globular clusters (about 70%-85%) exhibit peculiar chemical patterns with strong abundance variations in light elements along with constant abundances in heavy…T. Decressin, H. Baumgardt, P. Kroupa et al.·Dec 15, 2008SaveLearn
Metal enrichment of the neutral gas of blue compact dwarf galaxies: the compelling case of Pox 36We present the analysis of the interstellar spectrum of Pox 36 with the Far Ultraviolet Spectroscopic Explorer (FUSE). Pox 36 was selected because of the relatively low foreground gas content that…V. Lebouteiller, D. Kunth, T. X. Thuan et al.·Dec 15, 2008SaveLearn
Dynamical mixing of two stellar populations in globular clustersStars in globular clusters (GCs) exhibit a peculiar chemical pattern with strong abundance variations in light elements along with a constant abundance in heavy elements. These abundance anomalies…T. Decressin, H. Baumgardt, P. Kroupa·Dec 15, 2008SaveLearn
The Red Rectangle: Its Shaping Mechanism and its Source of Ultraviolet PhotonsThe proto-planetary Red Rectangle nebula is powered by HD 44179, a spectroscopic binary (P = 318 d), in which a luminous post-AGB component is the primary source of both luminosity and current mass…Adolf N. Witt, Uma P. Vijh, L. M. Hobbs et al.·Dec 15, 2008SaveLearn
Modeling of Disk-Star Interaction: Different Regimes of Accretion and VariabilityThe appearance and time variability of accreting millisecond X-ray pulsars (hereafter AMXPs, e.g. Wijnands & van der Klis 1998) depends strongly on the accretion rate, the effective viscosity and the…Marina M. Romanova, Akshay K. Kulkarni, Min Long et al.·Dec 15, 2008SaveLearn
IceCube: Status and First ResultsIceCube is a cubic neutrino telescope under construction at the South Pole since the austral summer 2004/2005 with a total instrumented volume of the order of 1 km3. At the moment it is taking data…P. Berghaus·Dec 15, 2008SaveLearn
Shock fragmentation model for gravitational collapseA cloud of gas collapsing under gravity will fragment. We present a new theory for this process, in which layers shocked gas fragment due to their gravitational instability. Our model explains why…M. Wilkinson, B. Mehlig, M. A. Morgan·Dec 15, 2008SaveLearn
High Redshift Metals I.: The Decline of C IV at z > 5.3We present the results from our search for C IV in the intergalactic medium at redshifts z=5.3-6.0. We have observed four z~6 QSOs with Keck/NIRSPEC in echelle mode. The data are the most sensitive…George D. Becker, Michael Rauch, Wallace L. W. Sargent·Dec 15, 2008SaveLearn
The Frequency of Warm Debris Disks and Transition Disks in a Complete Sample of Intermediate-Mass GLIMPSE Stars: Placing Constraints on Disk LifetimesThe incidence of dusty debris disks around low- and intermediate-mass stars has been investigated numerous times in order to understand the early stages of planet formation. Most notably, the IRAS…B. Uzpen, H. A. Kobulnicky, K. Kinemuchi·Dec 15, 2008SaveLearn
Angular Momentum Loss and Stellar spin-down in Magnetic Massive StarsWe examine the angular momentum loss and associated rotational spin-down for magnetic hot stars with a line-driven stellar wind and a rotation-aligned dipole magnetic field. Our analysis here is…Asif ud-Doula, Stanley P. Owocki, Richard H. D. Townsend·Dec 15, 2008SaveLearn
Application of the Trend Filtering Algorithm in the search for multiperiodic signalsDuring the past few years the Trend Filtering Algorithm (TFA) has become an important utility in filtering out time-dependent systematic effects in photometric databases for extrasolar planetary…G. Kovacs, G. A. Bakos·Dec 15, 2008SaveLearn
An Accurate Determination of the Optical Periodic Modulation in the X-Ray Binary SAX J1808.4-3658We report on optical imaging of the X-ray binary SAX J1808.4-3658 with the 8-m Gemini South Telescope. The binary, containing an accretion-powered millisecond pulsar, appears to have a large periodic…Zhongxiang Wang, Cees Bassa, Andrew Cumming et al.·Dec 15, 2008SaveLearn
The host galaxies of Compact Steep Spectrum and Gigahertz-Peaked Spectrum radio sourcesI will review some of the developments in studies of the host galaxy properties of Compact Steep Spectrum (CSS) and GigaHertz-Peaked Spectrum (GPS) radio sources. In contrast to previous reviews…J. Holt·Dec 15, 2008SaveLearn
Birefringence, CMB polarization and magnetized B-modeEven in the absence of a sizable tensor contribution, a B-mode polarization can be generated because of the competition between a pseudo-scalar background and pre-decoupling magnetic fields. By…Massimo Giovannini, Kerstin E. Kunze·Dec 15, 2008SaveLearn
PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (II)We present a new multi-fluid, grid MHD code PIERNIK, which is based on the Relaxing TVD scheme (Jin and Xin, 1995). The original scheme (see Trac & Pen (2003) and Pen et al. (2003)) has been extended…Michał Hanasz, Kacper Kowalik, Dominik Wóltański et al.·Dec 15, 2008SaveLearn
Detection of the second eclipsing high mass X-ray binary in M 33Chandra data of the X-ray source [PMH2004] 47 were obtained in the ACIS Survey of M 33 (ChASeM33) in 2006. During one of the observations, the source varied from a high state to a low state and back,…W. Pietsch, F. Haberl, T. J. Gaetz et al.·Dec 15, 2008SaveLearn
Scattering polarization due to light source anisotropyWe consider the polarization arising from scattering in an envelope illuminated by a central anisotropic source. Spherical harmonics are used to describe both the light source anisotropy and the…R Ignace, M Al-Malki, J Simmons et al.·Dec 15, 2008SaveLearn
The basic role of magnetic field in stellar evolutionMagnetic field is playing an important role at all stages of star evolution from star formation to the endpoints. The main effects are briefly reviewed. We also show that O-type stars have large…André Maeder, Georges Meynet, Cyril Georgy et al.·Dec 15, 2008SaveLearn