LCDM Satellites and HI Companions - The Arecibo ALFA Survey of NGC 2903We have conducted a deep, complete HI survey, using Arecibo/ALFA, of a field centered on the nearby, isolated galaxy, NGC 2903, which is similar to the Milky Way in its properties. The field size was…J. A. Irwin, G. L. Hoffman, K. Spekkens et al.·Oct 7, 2008SaveLearn
General Relativistic Magnetohydrodynamic Simulations of the Hard State as a Magnetically-Dominated Accretion Flow(Abridged) We present one of the first physically-motivated two-dimensional general relativistic magnetohydrodynamic (GRMHD) numerical simulations of a radiatively-cooled black-hole accretion disk.…P. Chris Fragile, David L. Meier·Oct 7, 2008SaveLearn
The Discovery of Diffuse Radio Polarization Structures in the NVSSWe have developed a method for recovering polarization structures from the NRAO Very Large Array Sky Survey (NVSS) on larger angular scales than the nominal 15 arc minute survey limit. The technique…Lawrence Rudnick, Shea Brown·Oct 7, 2008SaveLearn
Impacts of a Supersonic Shock Front on Star Formation in the Bullet ClusterWe use the Bullet Cluster (1E0657-56) to investigate the extent to which star formation in cluster galaxies is influenced by ram pressure from supersonic gas (Mach 3) during a cluster merger. While…Sun Mi Chung, Anthony H. Gonzalez, Douglas Clowe et al.·Oct 7, 2008SaveLearn
Dynamics of a self-gravitating magnetized neutron sourceThe dynamics of a self-gravitating neutron gas in presence of a magnetic field is being studied taking the equation of state of a magnetized neutron gas obtained in a previous study [2]. We work in a…D. Manreza Paret·Oct 6, 2008SaveLearn
Scientific Highlights from Observations of Active Galactic Nuclei with the MAGIC TelescopeSince 2004, the MAGIC gamma-ray telescope has newly discovered 6 TeV blazars. The total set of 13 MAGIC-detected active galactic nuclei includes well-studied objects at other wavelengths like…Robert Wagner·Oct 6, 2008SaveLearn
Formation of the first nuclear clusters and massive black holes at high redshiftWe present a model for the formation of massive black holes ( 1000 ) due to stellar-dynamical processes in the first stellar clusters formed at early cosmic times (z10-20). The high…Bernadetta Devecchi, Marta Volonteri·Oct 6, 2008SaveLearn
Axisymmetric magnetic fields in stars: relative strengths of poloidal and toroidal componentsIn this third paper in a series on stable magnetic equilibria in stars, I look at the stability of axisymmetric field configurations and in particular at the relative strengths of the toroidal and…J. Braithwaite·Oct 6, 2008SaveLearn
Time-Dependent Corrections to the Ly-alpha Escape Probability During Cosmological Hydrogen RecombinationWe consider the effects connected with the detailed radiative transfer during the epoch of cosmological recombination on the ionization history of our Universe. We focus on the escape of photons from…J. Chluba, R. A. Sunyaev·Oct 6, 2008SaveLearn
AMiBA Observations, Data Analysis and Results for Sunyaev-Zel'dovich EffectsWe present observations, analysis and results for the first-year operation of AMiBA, an interferometric experiment designed to study cosmology via the measurement of Cosmic Microwave Background…J. -H. P. Wu, P. T. P. Ho, C. -W. L. Huang et al.·Oct 6, 2008SaveLearn
Numerical study of large-scale vorticity generation in shear-flow turbulenceSimulations of stochastically forced shear-flow turbulence in a shearing-periodic domain are used to study the spontaneous generation of large-scale flow patterns in the direction perpendicular to…Petri J. Käpylä, Dhrubaditya Mitra, Axel Brandenburg·Oct 6, 2008SaveLearn
Kinematics of the old stellar population at the Galactic CenterWe aim at a detailed description of the kinematic properties of the old, (several Gyrs) late-type CO-absorption star population among the Galactic centre (GC) cluster stars. We applied AO-assisted,…S. Trippe, S. Gillessen, O. E. Gerhard et al.·Oct 6, 2008SaveLearn
Hadronic versus leptonic origin of the gamma-ray emission from Supernova Remnant RX J1713.7-3946Aims. The hadronic vs. leptonic origin of the gamma-ray emission from the Supernova Remnant RX J1713.7-3946 is discussed both in the light of new observations and from a theoretical point of view.…E. G. Berezhko, H. J. Völk·Oct 6, 2008SaveLearn
On the road to discovery of relic gravitational waves: The TE and BB Correlations in the cosmic microwave background radiationThe detection of primordial gravitational waves is one of the biggest challenges of the present time. The existing (Wilkinson Microwave Anisotropy Probe) observations are helpful on the road to this…W. Zhao, D. Baskaran, L. P. Grishchuk·Oct 6, 2008SaveLearn
Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak Lensing and AMiBA SZE ObservationsWe present a multiwavelength analysis of a sample of four hot (TX>8keV) X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBA Sunyaev-Zel'dovich effect (SZE) and Subaru weak…Keiichi Umetsu, Mark Birkinshaw, Guo-Chin Liu et al.·Oct 6, 2008SaveLearn
RXTE-PCA Observations of XMMU J054134.7-682550We analyzed RXTE-PCA observations of a recent outburst of the X-ray pulsar XMMU J054134.7-682550. We calculated the pulse frequency history of the source. We found no sign of a binary companion.…S. C. Inam, L. J. Townsend, V. A. McBride et al.·Oct 6, 2008SaveLearn
Oxygen abundance in local disk and bulge: chemical evolution with a strictly universal IMFThe empirical differential oxygen abundance distribution (EDOD) is deduced from subsamples related to two different samples involving solar neighbourhood (SN) thick disk, thin disk, halo, and bulge…R. Caimmi, E. Milanese·Oct 6, 2008SaveLearn
The impact of accretion disk winds on the X-ray spectrum of AGN: Part 2 - XSCORT + Hydrodynamic Simulationsabridged: We use XSCORT, together with the hydrodynamic accretion disc wind simulation from Proga & Kallman (2004), to calculate the impact that the accretion disk wind has on the X-ray spectrum from…N. J. Schurch, C. Done, D. Proga·Oct 6, 2008SaveLearn
Black-Hole Engine Kinematics, Flares from PKS 2155-304, and Multiwavelength Blazar AnalysisKinematical and luminosity relations for black-hole jet sources are reviewed. If the TeV flares observed from PKS 2155-304 in 2006 July are assumed to originate from a black hole with mass $≈…Charles D. Dermer, Justin D. Finke, Govind Menon·Oct 6, 2008SaveLearn
Fundamental Properties of Low-Mass Stars and Brown DwarfsPrecise measurements of the fundamental properties of low-mass stars and brown dwarfs are key to understanding the physics underlying their formation and evolution. While there has been great…Michael C. Liu, Keivan G. Stassun, France Allard et al.·Oct 6, 2008SaveLearn
The clustering of radio galaxies at z~0.55 from the 2SLAQ LRG surveyWe examine the clustering properties of low-power radio galaxies at redshift 0.4<z<0.8, using data from the 2SLAQ Luminous Red Galaxy (LRG) survey. We find that radio-detected LRGs (with optical…David A. Wake, Scott M. Croom, Elaine M. Sadler et al.·Oct 6, 2008SaveLearn
The proton microquasarWe present a model for high-energy emission in microquasars where the energy content of the jets is dominated by relativistic protons. We also include a primary leptonic component. Particles are…Gabriela S. Vila, Gustavo E. Romero·Oct 6, 2008SaveLearn
The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACEOur aim is to determine the plasma properties of a coronal bright point and compare its magnetic topology extrapolated from magnetogram data with its appearance in X-ray images. We analyse…D. Pérez-Suárez, R. C. Maclean, J. G. Doyle et al.·Oct 6, 2008SaveLearn
Formation and Evolution of Planetary Systems (FEPS): Properties of Debris Dust around Solar-type StarsWe present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems (FEPS) Legacy program. These data…John M. Carpenter, Jeroen Bouwman, Eric E. Mamajek et al.·Oct 6, 2008SaveLearn
IAU Planet Definition: Some Confusions and Their ModificationsInternational Astronomical Union (IAU) has passed the must needed definition of planet in its general assembly held in Prague during August 2006. The definition had to be passed by means of voting. A…R. Sarma, K. Baruah, J. K. Sarma·Oct 6, 2008SaveLearn