CoRoT measures solar-like oscillations and granulation in stars hotter than the SunOscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong efforts of the…E. Michel, A. Baglin, M. Auvergne et al.·Dec 6, 2008SaveLearn
Stellar Age Estimation from ~3 Myr to ~3 GyrWe present recent progress on quantitative estimation of stellar ages using ind icators such as theoretical evolutionary tracks, rotation, rotation-driven chrom ospheric and coronal activity, and…Lynne Hillenbrand, Eric Mamajek, John Stauffer et al.·Dec 6, 2008SaveLearn
Age-Related Observations of Low Mass Pre-Main and Young Main Sequence Stars (Invited Review)This overview summarizes the age dating methods available for young sub-solar mass stars. Pre-main sequence age diagnostics include the Hertzsprung-Russell (HR) diagram, spectroscopic surface gravity…Lynne A. Hillenbrand·Dec 6, 2008SaveLearn
Searching for Transient Pulses with the ETA Radio TelescopeArray-based, direct-sampling radio telescopes have computational and communication requirements unsuited to conventional computer and cluster architectures. Synchronization must be strictly…Cameron D. Patterson, Steven W. Ellingson, Brian S. Martin et al.·Dec 6, 2008SaveLearn
Big Bang Nucleosynthesis with Independent Neutrino Distribution FunctionsWe have performed new Big Bang Nucleosynthesis calculations which employ arbitrarily-specified, time-dependent neutrino and antineutrino distribution functions for each of up to four neutrino…Christel J. Smith, George M. Fuller, Michael S. Smith·Dec 6, 2008SaveLearn
Feast and Famine: Regulation of Black Hole Growth in Low Redshift GalaxiesWe analyze the observed distribution of Eddington ratios as a function of supermassive black hole mass for a large sample of nearby galaxies drawn from the Sloan Digital Sky Survey. We demonstrate…Guinevere Kauffmann, Timothy M. Heckman·Dec 5, 2008SaveLearn
The impact of TP-AGB stars on hierarchical galaxy formation modelsThe spectro-photometric properties of galaxies in galaxy formation models are obtained by combining the predicted history of star formation and mass accretion with the physics of stellar evolution…Chiara Tonini, Claudia Maraston, Julien Devriendt et al.·Dec 5, 2008SaveLearn
Late time observations of GRB080319B: jet break, host galaxy and accompanying supernovaThe Swift discovered GRB080319B was by far the most distant source ever observed at naked eye brightness, reaching a peak apparent magnitude of 5.3 at a redshift of z=0.937. We present our late-time…Nial R. Tanvir, Evert Rol, Andrew Levan et al.·Dec 5, 2008SaveLearn
Massive Black Hole Recoil in High Resolution HostsThe final inspiral and coalescence of a black hole binary can produce highly beamed gravitational wave radiation. To conserve linear momentum, the black hole remnant can recoil with "kick"…Javiera Guedes, Jürg Diemand, Marcel Zemp et al.·Dec 5, 2008SaveLearn
A Map of the Integrated Sachs-Wolfe Signal from Luminous Red GalaxiesWe construct a map of the time derivative of the gravitational potential traced by SDSS Luminous Red Galaxies. The potential decays on large scales due to cosmic acceleration, leaving an imprint on…Benjamin R. Granett, Mark C. Neyrinck, István Szapudi·Dec 5, 2008SaveLearn
Dark torsion as the cosmic speed-upIt is shown that the recently detected acceleration of the universe can be understood by considering a modification of the teleparallel equivalent of General Relativity (TEGR), with no need of dark…Gabriel Bengochea, Rafael Ferraro·Dec 5, 2008SaveLearn
Numerical Simulation of the Viscous-like Flow in and Around the Plasma Tail of a CometWe model the interaction of the solar wind with the plasma tail of a comet by means of numerical simulations, taking into account the effects of viscous-like forces.A 2D hydrodynamical, two species,…M. Reyes-Ruiz, H. Perez-de-Tejada, H. Aceves et al.·Dec 5, 2008SaveLearn
Modeling The Star Forming Universe at z=2: Impact of Cold Accretion FlowsWe present results of a semi-analytic model (SAM) that includes cold accretion and a porosity-based prescription for star formation. We can recover the puzzling observational results of low V/σ…S. Khochfar, J. Silk·Dec 5, 2008SaveLearn
The Coyote Universe I: Precision Determination of the Nonlinear Matter Power SpectrumNear-future cosmological observations targeted at investigations of dark energy pose stringent requirements on the accuracy of theoretical predictions for the clustering of matter. Currently, N-body…Katrin Heitmann, Martin White, Christian Wagner et al.·Dec 5, 2008SaveLearn
Nearby young stars selected by proper motion. I. Four new members of the Beta Pictoris moving group from the Tycho-2 catalogWe describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions. We show that from the mean motion vector of a known or…Sebastien Lepine, Michal Simon·Dec 5, 2008SaveLearn
Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004: I. Inner jet kinematicsWe observed the blazar 0716+714 with the VLBA during its active state in 2003-2004. In this paper we discuss multi-frequency analysis of the inner jet (first 1 mas) kinematics. The…E. A. Rastorgueva, K. Wiik, T. Savolainen et al.·Dec 5, 2008SaveLearn
Results from the First Science Run of the ZEPLIN-III Dark Matter Search ExperimentThe ZEPLIN-III experiment in the Palmer Underground Laboratory at Boulby uses a 12kg two-phase xenon time projection chamber to search for the weakly interacting massive particles (WIMPs) that may…V. N. Lebedenko, H. M. Araujo, E. J. Barnes et al.·Dec 5, 2008SaveLearn
XMM-Newton detects a relativistically broadened iron line in the spectrum of the ms X-ray pulsar SAX J1808.4-3658We report on a 63-ks long XMM-Newton observation of the accreting millisecond pulsar SAX J1808.4-3658 during the latest X-ray outburst which started on September 21st 2008. The pn spectrum shows a…A. Papitto, T. Di Salvo, A. D'Aì et al.·Dec 5, 2008SaveLearn
Observing the clustering properties of galaxy clusters in dynamical dark-energy cosmologiesWe study the clustering properties of galaxy clusters expected to be observed by various forthcoming surveys both in the X-ray and sub-mm regimes by the thermal Sunyaev-Zel'dovich effect. Several…C. Fedeli, L. Moscardini, M. Bartelmann·Dec 5, 2008SaveLearn
Time dependence of cosmological and inflationary parameters in slow-roll inflationThe dependence of cosmological and inflationary parameters on time during the last 60 e-folds in inflation is investigated using a slow-roll inflation model. The time dependence of the inflaton field…Shiro Hirai, Tomoyuki Takami·Dec 5, 2008SaveLearn
Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic SimulationsRotating magnetized compact objects and their accretion discs can generate strong toroidal magnetic fields driving highly magnetized plasmas into relativistic jets. Of significant concern, however,…Jonathan C. McKinney, Roger D. Blandford·Dec 5, 2008SaveLearn
The Chandra survey of the SMC "Bar": II. Optical counterparts of X-ray sourcesWe present the most likely optical counterparts of 113 X-ray sources detected in our Chandra survey of the central region of the Small Magellanic Cloud (SMC) based on the OGLE-II and MCPS catalogs.…Vallia Antoniou, Andreas Zezas, Despina Hatzidimitriou et al.·Dec 5, 2008SaveLearn
Using Magnetic Activity and Galactic Dynamics to Constrain the Ages of M DwarfsWe present a study of the dynamics and magnetic activity of M dwarfs using the largest spectroscopic sample of low-mass stars ever assembled. The age at which strong surface magnetic activity (as…Andrew A. West, Suzanne L. Hawley, John J. Bochanski et al.·Dec 5, 2008SaveLearn
Chi Values for Blue Emission Lines in M DwarfsWe compute chi values for blue emission lines in active M dwarfs. Using flux-calibrated spectra from nearby M dwarfs and spectral M dwarf templates from SDSS, we derive analytic relations that…Andrew A. West, Suzanne L. Hawley·Dec 5, 2008SaveLearn
A First Look at Rotation in Inactive Late-Type M DwarfsWe have examined the relationship between rotation and activity in 14 late-type (M6-M7) M dwarfs, using high resolution spectra taken at the W.M. Keck Observatory and flux-calibrated spectra from the…Andrew A. West, Gibor Basri·Dec 5, 2008SaveLearn