Galaxies in a simulated ΛCDM Universe I: cold mode and hot coresWe study the formation of galaxies in a (50 Mpc/h)3 cosmological simulation (2x2883 particles), evolved using the entropy conserving SPH code Gadget-2. Most of the baryonic mass in galaxies of all…Dušan Kereš, Neal Katz, Mark Fardal et al.·Sep 8, 2008SaveLearn
Solar Activity: Triennial Report of IAU Commission 10 (2006-2009)Commission 10 deals with solar activity in all of its forms, ranging from the smallest nanoflares to the largest coronal mass ejections. This report reviews scientific progress over the roughly…J. A. Klimchuk, L. van Driel-Gesztelyi, C. J. Schrijver et al.·Sep 8, 2008SaveLearn
Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar AnalogWe present Gemini near-infrared adaptive optics imaging and spectroscopy of a planetary mass candidate companion to 1RXS J160929.1-210524, a roughly solar-mass member of the 5 Myr-old Upper Scorpius…David Lafrenière, Ray Jayawardhana, Marten H. van Kerkwijk·Sep 8, 2008SaveLearn
Future Evolution of Bound Superclusters in an Accelerating UniverseThe evolution of marginally bound supercluster-like objects in an accelerating LambdaCDM Universe is followed, by means of cosmological simulations, from the present time to an expansion factor a =…Pablo A. Araya-Melo, Andreas Reisenegger, Andres Meza et al.·Sep 8, 2008SaveLearn
Formation of Jupiter and Conditions for Accretion of the Galilean SatellitesWe present an overview of the formation of Jupiter and its associated circumplanetary disk. Jupiter forms via a combination of planetesimal accretion and gravitational accumulation of gas from the…Paul R. Estrada, Ignacio Mosqueira, Jack J. Lissauer et al.·Sep 8, 2008SaveLearn
Re-examining Larson's Scaling Relationships in Galactic Molecular CloudsThe properties of Galactic molecular clouds tabulated by Solomon etal (1987) (SRBY) are re-examined using the Boston University-FCRAO Galactic Ring Survey of 13CO J=1-0 emission. These new data…Mark Heyer, Coleman Krawczyk, Julia Duval et al.·Sep 8, 2008SaveLearn
Dynamical dark energy from extra dimensionsWe consider multidimensional cosmological model with a higher-dimensional product manifold M = R x Rd0 x Hd1/Γwhere Rd0 is d0-dimensional Ricci-flat external (our) space and Hd1/Γis…V. Baukh, A. Zhuk·Sep 8, 2008SaveLearn
Interactions of cosmological gravitational waves and magnetic fieldsThe energy momentum tensor of a magnetic field always contains a spin-2 component in its anisotropic stress and therefore generates gravitational waves. It has been argued in the literature (Caprini…Elisa Fenu, Ruth Durrer·Sep 8, 2008SaveLearn
Biases on the cosmological parameters and thermal SZ residualsWe examine the biases induced on cosmological parameters when the presence of secondary anisotropies is not taken into account in Cosmic Microwave Background analyses. We first develop an exact…Nicolas Taburet, Nabila Aghanim, Marian Douspis et al.·Sep 8, 2008SaveLearn
Polarization of the Crab pulsar and nebula as observed by the Integral/IBIS telescopeNeutron stars generate powerful winds of relativistic particles that form bright synchrotron nebulae around them. Polarimetry provides a unique insight into the geometry and magnetic configuration of…M. Forot, Philippe Laurent, I A. Grenier et al.·Sep 8, 2008SaveLearn
Photodesorption of ices I: CO, N2 and CO2A longstanding problem in astrochemistry is how molecules can be maintained in the gas phase in dense inter- and circumstellar regions. Photodesorption is a non-thermal desorption mechanism, which…Karin I. Oberg, Ewine F. van Dishoeck, Harold Linnartz·Sep 8, 2008SaveLearn
How eccentric orbital solutions can hide planetary systems in 2:1 resonant orbitsThe Doppler technique measures the reflex radial motion of a star induced by the presence of companions and is the most successful method to detect exoplanets. If several planets are present, their…Guillem Anglada-Escude, Mercedes Lopez-Morales, John E. Chambers·Sep 8, 2008SaveLearn
Nucleosynthesis Predictions for Intermediate-Mass AGB Stars: Comparison to Observations of Type I Planetary NebulaeType I planetary nebulae (PNe) have high He/H and N/O ratios and are thought to be descendants of stars with initial masses of ~3-8Msun. These characteristics indicate that the progenitor stars…Amanda I. Karakas, Mark A. van Raai, Maria Lugaro et al.·Sep 8, 2008SaveLearn
Pixelization and Dynamic Range in Radio InterferometryThis study investigates some of the consequences of representing the sky by a rectangular grid of pixels on the dynamic range of images derived from radio interferometric measurements. In particular,…W. D. Cotton, Juan M. Uson·Sep 8, 2008SaveLearn
Candidate AGNs in Late-Type GalaxiesWe have assembled a sample of 64 late-type spiral galaxies (T types 6.0-9.0, corresponding to Hubble types Scd-Sm) with archival Chandra data. At a signal-to-noise (S/N) threshold of 3, we find 12…Louis-Benoit Desroches, Luis Ho·Sep 8, 2008SaveLearn
Phase-Space Density Profiles in Scale-Free CosmologiesWe use a set of high-resolution simulations of scale-free Einstein-de Sitter cosmologies to investigate the logarithmic slope of the phase-space density profile Q(r) = ρ(r)/σ3(r) of dark matter…Steffen R. Knollmann, Alexander Knebe, Yehuda Hoffman·Sep 8, 2008SaveLearn
Formation and Dynamical Evolution of Multiple Stellar Generations in Globular ClustersSome globular clusters are observed to host a population of second generation (SG) stars which show chemical anomalies and must have formed from gas containing matter processed in the envelopes of…Annibale D'Ercole, Enrico Vesperini, Francesca D'Antona et al.·Sep 8, 2008SaveLearn
A Large-Area Search for Low-Mass Objects in Upper Scorpius II: Age and Mass DistributionsWe present continued results from a wide-field, ~150 deg2, optical photometric and spectroscopic survey of the northern part of the ~5 Myr-old Upper Scorpius OB Association. Photometry and spectral…Catherine L. Slesnick, Lynne A. Hillenbrand, John M. Carpenter·Sep 8, 2008SaveLearn
High Precision Radial Velocity Measurements in the Infrared: A First Assessment of the RV Stability of CRIRESHigh precision radial velocity (RV) measurements in the near infrared are on high demand, especially in the context of exoplanet search campaigns shifting their interest to late type stars in order…Andreas Seifahrt, Hans-Ulrich Kaeufl·Sep 8, 2008SaveLearn
Black hole mass measurements using ionized gas discs: systematic dust effectsUsing detailed Monte Carlo radiative transfer simulations in realistic models for galactic nuclei, we investigate the influence of interstellar dust in ionized gas discs on the rotation curves and…Maarten Baes·Sep 8, 2008SaveLearn
First nonlinear force-free field extrapolations of SOLIS/VSM dataWe study the coronal magnetic field structure inside active regions and its temporal evolution. We attempt to compare the magnetic configuration of an active region in a very quiet period with that…J. K. Thalmann, T. Wiegelmann, N. -E. Raouafi·Sep 8, 2008SaveLearn
Interpreting Helioseismic Structure Inversion Results of Solar Active RegionsHelioseismic techniques such as ring-diagram analysis have often been used to determine the subsurface structural differences between solar active and quiet regions. Results obtained by inverting the…Chia-Hsien Lin, Sarbani Basu, Linghuai Li·Sep 8, 2008SaveLearn
Central engines of Gamma Ray Bursts. Magnetic mechanism in the collapsar modelIn this study we explore the magnetic mechanism of hypernovae and relativistic jets of long duration gamma ray bursts within the collapsar scenario. This is an extension of our earlier work [1]. We…Maxim V. Barkov, Serguei S. Komissarov·Sep 8, 2008SaveLearn
Solving the Imaging Problem with Coherently Integrated Multiwavelength DataRecovering images from optical interferometric observations is one of the major challenges in the field. Unlike the case of observations at radio wavelengths, in the optical the atmospheric…H. R. Schmitt, T. A. Pauls, J. T. Armstrong et al.·Sep 8, 2008SaveLearn
The Monoceros R2 Molecular CloudThe Monoceros R2 region was first recognized as a chain of reflection nebulae illuminated by A- and B-type stars. These nebulae are associated with a giant molecular cloud that is one of the closest…John Carpenter, Klaus Hodapp·Sep 8, 2008SaveLearn