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Astrophysics papers — page 77

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Driving Currents for Flux Rope Coronal Mass Ejections
We present a method for measuring electrical currents enclosed by flux rope structures that are ejected within solar coronal mass ejections (CMEs). Such currents are responsible for providing the…
Prasad Subramanian, Angelos VourlidasOct 23, 2008
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Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey
Optical and near-infrared (NIR) spectra are presented for ULAS J131911.29+095951.4 (hereafter ULAS J1319+0950), a new redshift z = 6.127 +/- 0.004 quasar discovered in the Third Data Release (DR3) of…
D. J. Mortlock, M. Patel, S. J. Warren et al.Oct 22, 2008
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Lensed CMB temperature and polarization maps from the Millennium Simulation
We have constructed the first all-sky CMB temperature and polarization lensed maps based on a high-resolution cosmological N-body simulation, the Millennium Simulation (MS). We have exploited the…
Carmelita Carbone, Carlo Baccigalupi, Matthias Bartelmann et al.Oct 22, 2008
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Determining Star Formation Rates for Infrared Galaxies
We show that measures of star formation rates (SFRs) for infrared galaxies using either single-band 24 um or extinction-corrected Paschen-alpha luminosities are consistent in the total infrared…
G. H. Rieke, A. Alonso-Herrero, B. J. Weiner et al.Oct 22, 2008
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Modeling Molecular Hydrogen and Star Formation in Cosmological Simulations
We describe a phenomenological model for molecular hydrogen formation suited for applications in galaxy formation simulations, which includes on-equilibrium formation of molecular hydrogen on dust…
Nickolay Y. Gnedin, Konstantinos Tassis, Andrey V. KravtsovOct 22, 2008
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Quasar Clustering from SDSS DR5: Dependences on Physical Properties
Using a homogenous sample of 38,208 quasars with a sky coverage of 4000 deg2 drawn from the SDSS Data Release Five quasar catalog, we study the dependence of quasar clustering on luminosity,…
Yue Shen, Michael A. Strauss, Nicholas P. Ross et al.Oct 22, 2008
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Constraints on generating the primordial curvature perturbation and non-Gaussianity from instant preheating
We analyse models of inflation in which isocurvature perturbations present during inflation are converted into the primordial curvature perturbation during instant preheating. This can be due to an…
Christian T. ByrnesOct 22, 2008
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Interferometric and seismic constraints on the roAp star alpha Cir
We present new constraints on the rapidly oscillating Ap star alpha Cir, derived from a combination of interferometric and photometric data obtained with the Sydney University Stellar Interferometer…
I. M. Brandao, H. Bruntt, M. Cunha et al.Oct 22, 2008
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The multi-band nonthermal emission from the supernova remnant RX J1713.7-3946
Nonthermal X-rays and very high-energy (VHE) γ-rays have been detected from the supernova remnant (SNR) RX J1713.7-3946, and especially the recent observations with the Suzaku satellite…
J. Fang, L. Zhang, J. F. Zhang et al.Oct 22, 2008
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A History of Solar Activity over Millennia
Presented here is a review of present knowledge of the long-term behavior of solar activity on a multi-millennial timescale, as reconstructed using the indirect proxy method. The concept of solar…
Ilya G. UsoskinOct 22, 2008
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The MOND limit from space-time scale invariance
The MOND limit is shown to follow from a requirement of space-time scale invariance of the equations of motion for nonrelativistic, purely gravitational systems; i.e., invariance of the equations of…
Mordehai MilgromOct 22, 2008
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Using the Tremaine-Weinberg method to measure pattern speeds from Hαvelocity maps
The Tremaine-Weinberg method is a well-known model independent technique for measuring density wave pattern speeds in spiral galaxies. Here we show how it can be applied to the data cubes (maps of…
John Beckman, Kambiz Fathi, Nuria Piñol et al.Oct 22, 2008
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CMB polarization map derived from the WMAP 5 year data through Harmonic Internal Linear Combination
We have derived whole-sky CMB polarization maps from the WMAP 5 year polarization data, using the Harmonic Internal Linear Combination (HILC) method. Our HILC method incorporates spatial variability…
Jaiseung Kim, Pavel Naselsky, Per Rex ChristensenOct 22, 2008
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Nucleosynthesis in Electron Capture Supernovae of AGB Stars
We examine nucleosynthesis in the electron capture supernovae of progenitor AGB stars with an O-Ne-Mg core (with the initial stellar mass of 8.8 M). Thermodynamic trajectories for the first 810…
S. Wanajo, K. Nomoto, H. -Th. Janka et al.Oct 22, 2008
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Photometric investigation of bright type II-P Supernova 2004dj
CCD UBVRI photometry is presented for type II SN 2004dj for about 1200 days, starting day 2 past discovery. The photometric behaviour is typical for SNe II-P, although some minor peculiarities are…
D. Yu. Tsvetkov, V. P. Goranskiy, N. N. PavlyukOct 22, 2008
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Constraining the Proper Motions of Two Magnetars
We attempt to measure the proper motions of two magnetars - the soft gamma-ray repeater SGR 1900+14 and the anomalous X-ray pulsar 1E 2259+586 - using two epochs of Chandra observations separated by…
D. L. Kaplan, S. Chatterjee, B. M. Gaensler et al.Oct 22, 2008
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The population of Magellanic Cloud planetary nebulae
In this review we address the progress that has been made toward the understanding the population of Magellanic Cloud planetary nebulae since the last Magellanic Cloud Symposium. Planetary nebulae in…
Letizia StanghelliniOct 22, 2008
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Captured at Millimeter Wavelengths: a Flare from the Classical T Tauri Star DQ Tau
For several hours on 2008 April 19 the T Tauri spectroscopic binary DQ Tau was observed to brighten, reaching a maximum detected flux of 468 mJy and likely making it (briefly) the brightest object at…
D. M. Salter, M. R. Hogerheijde, G. A. BlakeOct 22, 2008
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Modeling a high velocity LMC. The formation of the Magellanic Stream
I use high resolution N-body/SPH simulations to model the new proper motion of the Large Magellanic Cloud (LMC) within the Milky Way (MW) halo and investigate the effects of gravitational and…
Chiara MastropietroOct 22, 2008
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Formation of protostellar jets as two-component outflows from star-disk magnetospheres
Axisymmetric magnetohydrodynamic (MHD) simulations have been applied to investigate the interrelation of a central stellar magnetosphere and stellar wind with a surrounding magnetized disk outflow…
Christian FendtOct 22, 2008
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The influence of star clusters on galactic disks: new insights on star-formation in galaxies
Stars form in embedded star clusters which play a key role in determining the properties of a galaxy's stellar population. Physical mechanisms discussed in this paper are runaway stars shot out…
Pavel KroupaOct 22, 2008
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Low-Velocity Halo Clouds
Models that reproduce the observed high-velocity clouds (HVCs) also predict clouds at lower radial velocities that may easily be confused with Galactic disk (|z| < 1 kpc) gas. We describe the first…
J. E. G. Peek, Carl Heiles, M. E. Putman et al.Oct 22, 2008
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Polarization Patterns in Pulsar Radio Emission
A variety of intriguing polarization patterns are created when polarization observations of the single pulses from radio pulsars are displayed in a two-dimensional projection of the Poincare sphere.…
Mark M. McKinnonOct 22, 2008
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Tests of Chemical Enrichment Scenarios in Ellipticals Using Continuum Colors and Spectroscopy
We combine spectroscopic metallicity values with integrated narrowband continuum colors to explore the internal metallicity distribution in early-type galaxies. The different techniques for…
J. Schombert, K. RakosOct 22, 2008
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Stellar Atmospheric Parameters: The Four-Step Program and Gaia's Radial Velocity Spectrometer
The determination of atmospheric parameters is the first and most fundamental step in the analysis of a stellar spectrum. Current and forthcoming surveys involve samples of up to several million…
C. Allende PrietoOct 22, 2008
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