Pressure Relations and Vertical Equilibrium in the Turbulent, Multiphase ISMWe use numerical simulations of turbulent, multiphase, self-gravitating gas orbiting in model disk galaxies to study the relationships among pressure, the vertical gas distribution, and the ratio of…H. Koyama, E. C. Ostriker·Dec 10, 2008SaveLearn
Electron acceleration at a low-Mach-number perpendicular collisionless shockA full particle simulation study is carried out on the electron acceleration at a collisionless, relatively low Alfven Mach number (MA=5), perpendicular shock. Recent self-consistent hybrid shock…Takayuki Umeda, Masahiro Yamao, Ryo Yamazaki·Dec 10, 2008SaveLearn
Gas Properties and Implications for Galactic Star Formation in Numerical Models of the Turbulent, Multiphase ISMUsing numerical simulations of galactic disks resolving scales from ~1 to several hundred pc, we investigate dynamical properties of the multiphase ISM with turbulence driven by star formation…H. Koyama, E. C. Ostriker·Dec 10, 2008SaveLearn
TeV neutrinos and gamma rays from pulsarsRecent studies suggest that pulsars could be strong sources of TeV muon neutrinos provided positive ions are accelerated by pulsar polar caps to PeV energies. In such a situation muon neutrinos are…A. Bhadra, R. K. Dey·Dec 10, 2008SaveLearn
Molecular Signatures in the Near Infrared Dayside Spectrum of HD 189733bWe have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 microns using the NICMOS instrument on the Hubble Space Telescope. The emergent spectrum contains significant modulation, which…M. R. Swain, G. Vasisht, G. Tinetti et al.·Dec 10, 2008SaveLearn
High velocity water maser emission from the Post-AGB star OH 009.1-0.4Observations of H2O masers towards the post-AGB star and water fountain source OH 009.1--0.4 were made as part of HOPS (The H2O southern galactic Plane Survey), with the Mopra radiotelescope.…A. J. Walsh, S. L. Breen, I. Bains et al.·Dec 10, 2008SaveLearn
HX-POL - A Balloon-Borne Hard X-Ray PolarimeterWe report on the design and estimated performance of a balloon-borne hard X-ray polarimeter called HX-POL. The experiment uses a combination of Si and Cadmium Zinc Telluride detectors to measure the…H. Krawczynski, A. Garson, Q. Li et al.·Dec 9, 2008SaveLearn
An implementation of radiative transfer in the cosmological simulation code GADGETWe present a novel numerical implementation of radiative transfer in the cosmological smoothed particle hydrodynamics (SPH) simulation code GADGET. It is based on a fast, robust and…M. Petkova, V. Springel·Dec 9, 2008SaveLearn
Tensors, non-Gaussianities, and the future of potential reconstructionWe present projections for reconstruction of the inflationary potential expected from ESA's upcoming Planck Surveyor CMB mission. We focus on the effects that tensor perturbations and the…Brian A. Powell, Konstantinos Tzirakis, William H. Kinney·Dec 9, 2008SaveLearn
Discovery of Large-Scale Gravitational Infall in a Massive Protostellar ClusterWe report Mopra (ATNF), Anglo-Australian Telescope, and Atacama Submillimeter Telescope Experiment observations of a molecular clump in Carina, BYF73 = G286.21+0.17, which give evidence of…Peter J. Barnes, Yoshinori Yonekura, Stuart D. Ryder et al.·Dec 9, 2008SaveLearn
Circumstellar disks around Herbig Be starsWe completed a search for circumstellar disks around Herbig Be stars using the NRAO Very Large Array (VLA) and the IRAM Plateau de Bure (PdB) interferometers. We present our new VLA and PdBI data for…T. Alonso-Albi, A. Fuente, R. Bachiller et al.·Dec 9, 2008SaveLearn
Analysis of non-Gaussian CMB maps based on the N-pdf. Application to WMAP dataWe present a new method based on the N-point probability distribution (pdf) to study non-Gaussianity in cosmic microwave background (CMB) maps. Likelihood and Bayesian estimation are applied to a…P. Vielva, J. L. Sanz·Dec 9, 2008SaveLearn
On the Origin of Cores in Simulated Galaxy Clusters(Abridged) The thermal state of the intracluster medium results from a competition between gas cooling and heating. The heating comes from two distinct sources: gravitational heating from the…N. L. Mitchell, I. G. McCarthy, R. G. Bower et al.·Dec 9, 2008SaveLearn
Cold CO in circumstellar disks: On the effects of photodesorption and vertical mixingAims. We attempt to understand the presence of gas phase CO below its freezing temperature in circumstellar disks. We study two promising mechanisms to explain this phenomenon: turbulent mixing and…F. Hersant, V. Wakelam, A. Dutrey et al.·Dec 9, 2008SaveLearn
JKCS041: a colour-detected galaxy cluster at zphot=1.9 with deep potential well as confirmed by X-ray data[Abridged] We report the discovery of JKCS041, a massive near-infrared selected cluster of galaxies z=1.9. The cluster was originally discovered using a modified red-sequence method and was also…S. Andreon, B. Maughan, G. Trinchieri et al.·Dec 9, 2008SaveLearn
A HST/WFPC2 survey of bright young clusters in M31. I. VdB0, a massive star cluster seen at ~= 25 MyrAims. We introduce our imaging survey of possible young massive globular clusters in M31 performed with the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). We present…S. Perina, P. Barmby, M. A. Beasley et al.·Dec 9, 2008SaveLearn
Long-Term Optical Monitoring of Eta Carinae. Multiband light curves for a complete orbital periodThe periodicity of 5.5 years for some observational events occurring in Eta Carinae manifests itself across a large wavelength range and has been associated with its binary nature. These events are…E. Fernandez-Lajus, C. Farina, A. F. Torres et al.·Dec 9, 2008SaveLearn
The Local Dimension: a method to quantify the Cosmic WebIt is now well accepted that the galaxies are distributed in filaments, sheets and clusters all of which form an interconnected network known as the Cosmic Web. It is a big challenge to quantify the…Prakash Sarkar, Somnath Bharadwaj·Dec 9, 2008SaveLearn
A cool starspot or a second transiting planet in the TrES-1 system?We investigate the origin of a flux increase found during a transit of TrES-1, observed with the HST. This feature in the HST light curve cannot be attributed to noise and is supposedly a dark area…M. Rabus, R. Alonso, J. A. Belmonte et al.·Dec 9, 2008SaveLearn
Being PC: Principal Components and Dark EnergyPrincipal component analysis is considered as an addition to the well-tested parametrization w(a)=w0+wa(1-a) for the dark energy equation of state. This brief note cautions against some unjustified…Roland de Putter, Eric V. Linder·Dec 9, 2008SaveLearn
The Nonisothermal Stage of Magnetic Star Formation. I. Formulation of the Problem and Method of SolutionWe formulate the problem of the formation and subsequent evolution of fragments (or cores) in magnetically-supported, self-gravitating molecular clouds in two spatial dimensions. The six-fluid…Matthew W. Kunz, Telemachos Ch. Mouschovias·Dec 9, 2008SaveLearn
Primordial Magnetic Fields in CosmologyMagnetic fields have been observed in galaxies, clusters of galaxies and probably in superclusters. While mechanisms exist to generate these in the late universe, it is possible that magnetic fields…Iain A. Brown·Dec 9, 2008SaveLearn
UBVI CCD Photometry of the Old Open Cluster NGC 1193We present UBVI photometry of the old open cluster NGC 1193. Color-magnitude diagrams (CMDs) of this cluster show a well defined main sequence and a sparse red giant branch. For the inner region of…Jaemann Kyeong, Sang Chul Kim, David Hiriart et al.·Dec 9, 2008SaveLearn
Local Star formation triggered by SN shocks in magnetized diffuse neutral cloudsIn this work, considering the impact of a SNR with a neutral magnetized cloud we derived analytically a set of conditions which are favorable for driving gravitational instability in the cloud and…M. R. M. Leao, E. M. de Gouveia Dal Pino, D. Falceta-Goncalves et al.·Dec 9, 2008SaveLearn
Axisymmetric mass models of S0 and spiral galaxies with boxy bulges: mass-to-light ratios, dark matter and barsWe examine a sample of 30 edge-on spiral and S0 galaxies that have boxy and peanut-shaped bulges. We compute model stellar kinematics by solving the Jeans equations for axisymmetric mass…Michael J. Williams, Martin Bureau, Michele Cappellari·Dec 9, 2008SaveLearn