Spatial Distributions of Young StarsWe analyze the spatial distributions of young stars in Taurus-Auriga and Upper Sco as determined from the two-point correlation function (i.e. the mean surface density of neighbors). The…Adam L. Kraus, Lynne A. Hillenbrand·Sep 4, 2008SaveLearn
Spatially-Resolved Medium Resolution Spectroscopy of an Interacting E+A (post-starburst) System with the Subaru telescopeWe have performed a spatially-resolved medium resolution long-slit spectroscopy of a nearby E+A (post-starburst) galaxy system, SDSSJ161330.18+510335.5. This E+A galaxy has an obvious companion…Tomotsugu Goto, Masafumi Yagi, Chisato Yamauchi·Sep 4, 2008SaveLearn
E+A and Companion Galaxies - I : A Catalogue and StatisticsBased on our intensive spectroscopic campaign with the GoldCam spectrograph on the Kitt Peak National Observatory (KPNO) 2.1-m telescope, we have constructed the first catalogue of E+A galaxies with…Chisato Yamauchi, Masafumi Yagi, Tomotsugu Goto·Sep 4, 2008SaveLearn
Evolution of the quasi-periodic oscillation frequency in GRO J1655-40 -- Implications for accretion disk dynamicsLow and intermediate frequency quasi-periodic oscillations (QPOs) are thought to be due to oscillations of Comptonizing regions or hot blobs embedded in Keplerian disks. Any movement of these…Sandip K. Chakrabarti, Dipak Debnath, Anuj Nandi et al.·Sep 4, 2008SaveLearn
Frequency analysis of Cepheids in the Large Magellanic Cloud. New types of classical Cepheid pulsatorsWe have performed a detailed systematic search for multiperiodicity in the Population I Cepheids of the Large Magellanic Cloud. In this process we have identified for the first time several new types…P. Moskalik, Z. Kolaczkowski·Sep 4, 2008SaveLearn
Relative distances of Omega Centauri and 47 TucanaeWe present precise optical and near-infrared ground-based photometry of two Globular Clusters (GCs): Omega Cen and 47 Tuc. These photometric catalogs are unbiased in the Red Giant Branch (RGB) region…G. Bono, P. B. Stetson, N. Sanna et al.·Sep 4, 2008SaveLearn
Mean-field effects in the Galloway-Proctor flowThe coefficients defining the mean electromotive force in a Galloway-Proctor flow are determined. This flow shows a two-dimensional pattern and is helical. The pattern wobbles in its plane. Apart…Karl-Heinz Rädler, Axel Brandenburg·Sep 4, 2008SaveLearn
A Keplerian Limit to Static Spherical Spacetimes in Curvature CoordinatesThe problem of a test body in the Schwarzschild geometry is investigated in a Keplerian limit. Beginning with the Schwarzschild metric, a solution to the limited case of approximately elliptical…Tyler J. Lemmon, Antonio R. Mondragon·Sep 4, 2008SaveLearn
Numerical examination of plasmoid-induced reconnection model for solar flares: the relation between plasmoid velocity and reconnection rateThe plasmoid-induced-reconnection model explaining solar flares based on bursty reconnection produced by an ejecting plasmoid suggests a possible relation between the ejection velocity of a plasmoid…Keisuke Nishida, Masaki Shimizu, Daikou Shiota et al.·Sep 4, 2008SaveLearn
The chromospherically active binary star EI Eridani I. Absolute dimensionsWe present a detailed determination of the astrophysical parameters of the chromospherically active binary star EI Eridani. Our new radial velocities allow to improve the set of orbital elements and…A. Washuettl, K. G. Strassmeier, T. Granzer et al.·Sep 4, 2008SaveLearn
Is H3+ cooling ever important in primordial gas?Studies of the formation of metal-free Population III stars usually focus primarily on the role played by H2 cooling, on account of its large chemical abundance relative to other possible molecular…S. C. O. Glover, D. W. Savin·Sep 4, 2008SaveLearn
Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emissionWe report high resolution spectroscopy of the moderately reddened (AV=3) early type star Cernis 52 located in a region of the Perseus molecular cloud complex with anomalous microwave emission. In…S. Iglesias-Groth, A. Manchado, D. A. García-Hernández et al.·Sep 4, 2008SaveLearn
The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster GalaxiesWe present Hubble Space Telescope imaging and spectroscopic observations of three Brightest Cluster Galaxies, Abell 1836-BCG, Abell 2052-BCG, and Abell 3565-BCG, obtained with the Wide Field and…E. Dalla Bonta', L. Ferrarese, E. M. Corsini et al.·Sep 4, 2008SaveLearn
A High Yield of New Sightlines for the Study of Intergalactic Helium: Far-UV-Bright Quasars from SDSS, GALEX, and HSTInvestigations of He II Ly-alpha (304 A rest) absorption toward a half-dozen quasars at z~3-4 have demonstrated the great potential of helium studies of the IGM, but the current critically small…David Syphers, Scott F. Anderson, Wei Zheng et al.·Sep 4, 2008SaveLearn
High-energy electron observations by PPB-BETS flight in AntarcticaWe have observed cosmic-ray electrons from 10 GeV to 800 GeV by a long duration balloon flight using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an…S. Torii, T. Yamagami, T. Tamura et al.·Sep 4, 2008SaveLearn
Imaging the Molecular Gas in a z=3.9 Quasar Host Galaxy at 0.3" Resolution: A Central, Sub-Kiloparsec Scale Star Formation Reservoir in APM 08279+5255We have mapped the molecular gas content in the host galaxy of the strongly lensed high redshift quasar APM 08279+5255 (z=3.911) with the Very Large Array at 0.3" resolution. The CO(J=1-0)…Dominik A. Riechers, Fabian Walter, Christopher L. Carilli et al.·Sep 4, 2008SaveLearn
The HARPS search for southern extra-solar planets: XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different periodA 10.24 days Neptune-mass planet was recently announced to orbit the nearby M2 dwarf Gl 176, based on 28 radial velocities measured with the HRS spectrograph on the Hobby-Heberly Telescope (HET). We…T. Forveille, X. Bonfils, X. Delfosse et al.·Sep 4, 2008SaveLearn
Cosmic Ray Acceleration by Supernova ShocksWe analyse the results of recent measurements of nonthermal emission from individual supernova remnants (SNRs) and their correspondence to the nonlinear kinetic theory of cosmic ray (CR) acceleration…E. G. Berezhko·Sep 4, 2008SaveLearn
Cosmic rays from active galactic nucleiCosmic ray (CR) acceleration at the shock created by the expanding cocoons around active galactic nuclei (AGNs) is studied. It is shown that above the energy 1018 eV the overall energy spectrum…E. G. Berezhko·Sep 4, 2008SaveLearn
Magnetic dynamo action in astrophysical turbulenceWe investigate the structure of magnetic field amplified by turbulent velocity fluctuations, in the framework of the kinematic Kazantsev-Kraichnan model. We consider Kolmogorov distribution of…Leonid Malyshkin, Stanislav Boldyrev·Sep 3, 2008SaveLearn
An Infrared High Proper Motion Survey Using 2MASS and SDSS: Discovery of M, L and T DwarfsA search of the Two Micron All Sky Survey and Sloan Digital Sky Survey reveals 36 previously unknown high proper motion objects with J<17. Their red-optical colors indicate that 27 are M dwarfs, 8…Scott S. Sheppard, Michael C. Cushing·Sep 3, 2008SaveLearn
The Gravitational Wave Signature of Core-Collapse SupernovaeWe review the ensemble of anticipated gravitational-wave (GW) emission processes in stellar core collapse and postbounce core-collapse supernova evolution. We discuss recent progress in the modeling…Christian D. Ott·Sep 3, 2008SaveLearn
A New Class of Luminous Transients and A First Census of Their Massive Stellar ProgenitorsThe progenitors of SN 2008S and the 2008 transient in NGC300 were dust-enshrouded, with extremely red mid-infrared (MIR) colors and relatively low luminosities. The transients were optically faint…Todd A. Thompson, Jose L. Prieto, K. Z. Stanek et al.·Sep 3, 2008SaveLearn
Thermodynamics of the early Universe with mirror dark matterMirror matter is a promising self-collisional dark matter candidate. Here we study the evolution of thermodynamical quantities in the early Universe for temperatures below ~100 MeV in presence of a…Paolo Ciarcelluti, Angela Lepidi·Sep 3, 2008SaveLearn
Model-Independent Distance Measurements from Gamma-Ray Bursts and Constraints on Dark EnergyGamma-Ray Bursts (GRB) are the most energetic events in the Universe, and provide a complementary probe of dark energy by allowing the measurement of cosmic expansion history that extends to…Yun Wang·Sep 3, 2008SaveLearn