A collimated, ionized bipolar structure and a high density torus in the young planetary nebula IRAS 17347-3139We present observations of continuum (lambda = 0.7, 1.3, 3.6 and 18 cm) and OH maser (lambda = 18 cm) emission toward the young planetary nebula IRAS 17347-3139, which is one of the three planetary…D. Tafoya, Y. Gomez, N. A. Patel et al.·Sep 23, 2008SaveLearn
Observing the First Stars and Black HolesThe high sensitivity of JWST will open a new window on the end of the cosmological dark ages. Small stellar clusters, with a stellar mass of several 106 Msun, and low-mass black holes (BHs), with a…Zoltan Haiman·Sep 23, 2008SaveLearn
Gamma-ray burst detection with the AGILE mini-calorimeterThe Mini-Calorimeter (MCAL) instrument on-board the AGILE satellite is a non-imaging gamma-ray scintillation detector sensitive in the 300keV-100MeV energy range with a total on-axis geometrical area…M. Marisaldi, C. Labanti, F. Fuschino et al.·Sep 23, 2008SaveLearn
Coagulation of small grains in disks: the influence of residual infall and initial small-grain contentTurbulent coagulation in protoplanetary disks is known to operate on timescale far shorter than the lifetime of the disk. In the absence of mechanisms that replenish the small dust grain population,…C. Dominik, C. P. Dullemond·Sep 23, 2008SaveLearn
Accreting White DwarfsThermonuclear (type Ia) supernovae are explosions in accreting white dwarfs, but the exact scenario leading to these explosions is still unclear. An important step to clarify this point is to…M. Hernanz, J. Jose·Sep 23, 2008SaveLearn
Monitoring the radio spectra of selected blazars in the Fermi-GST era. The Effelsberg 100 m telescope covering the cm bandThe analysis of the spectral energy distribution variability at frequencies from radio to TeV is a powerful tool in the investigation of the dynamics, the physics and the structure evolution…E. Angelakis, L. Fuhrmann, N. Marchili et al.·Sep 23, 2008SaveLearn
Dark matter scaling relations and the assembly epoch of Coma early-type galaxiesAxisymmetric, orbit-based dynamical models are used to derive dark matter scaling relations for Coma early-type galaxies. From faint to bright galaxies halo core-radii and asymptotic circular…J. Thomas, R. P. Saglia, R. Bender et al.·Sep 23, 2008SaveLearn
On aberration in gravitational lensingIt is known that a relative translational motion between the deflector and the observer affects gravitational lensing. In this paper, a lens equation is obtained to describe such effects on actual…M. Sereno·Sep 23, 2008SaveLearn
Radio Bursts Associated with Flare and Ejecta in the 13 July 2004 EventWe investigate coronal transients associated with a GOES M6.7 class flare and a coronal mass ejection (CME) on 13 July 2004. During the rising phase of the flare, a filament eruption, loop expansion,…S. Pohjolainen, K. Hori, T. Sakurai·Sep 23, 2008SaveLearn
A search for a dark matter annihilation signal towards the Canis Major overdensity with H.E.S.SA search for a dark matter (DM) annihilation signal into γ-rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario…HESS Collaboration, F. Aharonian·Sep 23, 2008SaveLearn
Bars driven by the Cosmology in stellar-gaseous disksWe present the first attempt to analyse the growth of the bar instability in stellar-gaseous disks evolving in a fully consistent cosmological scenario. We explored the role of the cosmology on pure…Anna Curir, Paola Mazzei, Giuseppe Murante·Sep 23, 2008SaveLearn
Convectively driven vortex flows in the SunWe have discovered small whirlpools in the Sun, with a size similar to the terrestrial hurricanes (<~0.5 Mm). The theory of solar convection predicts them, but they had remained elusive so far. The…J. A. Bonet, I. Marquez, J. Sanchez Almeida et al.·Sep 23, 2008SaveLearn
Localized magnetorotational instability and its role in the accretion disc dynamo(Abriged) The magnetorotational instability (MRI) is believed to be an efficient way to transport angular momentum in accretion discs. It has also been suggested as a way to amplify magnetic fields…G. Lesur, G. I. Ogilvie·Sep 23, 2008SaveLearn
Extrasolar planets and brown dwarfs around A-F type stars V. A planetary system found with HARPS around the F6IV-V star HD 60532Aims: In the frame of the search for extrasolar planets and brown dwarfs around early-type stars, we present the results obtained for the F-type main-sequence star HD 60532 (F6V) with HARPS. Methods:…M. Desort, A. -M. Lagrange, F. Galland et al.·Sep 23, 2008SaveLearn
Centimeter Polarimetry of the R Coronae Australis RegionCircularly polarized 3.5 cm continuum emission was detected toward three radio sources in the R CrA region using the Very Large Array. The Class I protostar IRS 5b persistently showed polarized radio…Minho Choi, Ken'ichi Tatematsu, Kenji Hamaguchi et al.·Sep 23, 2008SaveLearn
The X-ray Cluster Normalization of the Matter Power SpectrumThe number density of galaxy clusters provides tight statistical constraints on the matter fluctuation power spectrum normalization, traditionally phrased in terms of sigma8, the root mean square…J. Patrick Henry, August E. Evrard, Henk Hoekstra et al.·Sep 23, 2008SaveLearn
Vrijhk Photometry of PKS 0537-441 and PKS 2155-304 in 2006-2008We report the 2006-2008 light curves obtained with the REM telescope in VRIJHK bands for the two BL Lac objects PKS 0537-441 and PKS 2155-304Domenico Impiombato, Gino Tosti, Aldo Treves et al.·Sep 23, 2008SaveLearn
Molecular Hydrogen in the FUSE Translucent Lines of Sight: The Full SampleWe report total abundances and related parameters for the full sample of the FUSE survey of molecular hydrogen in 38 translucent lines of sight. New results are presented for the "second half" of the…Brian L. Rachford, Theodore P. Snow, Joshua D. Destree et al.·Sep 22, 2008SaveLearn
Deep MMT Transit Survey of the Open Cluster M37 IV: Limit on the Fraction of Stars With Planets as Small as 0.3 RJWe present the results of a deep (15 ~< r ~< 23), 20 night survey for transiting planets in the intermediate age open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5m…J. D. Hartman, B. S. Gaudi, M. J. Holman et al.·Sep 22, 2008SaveLearn
Intrinsic Ellipticity Correlation of SDSS Luminous Red Galaxies and Misalignment with their Host Dark Matter HalosWe investigate the orientation correlation of giant elliptical galaxies by measuring the intrinsic ellipticity correlation function of 83,773 luminous red galaxies (LRGs) at redshifts 0.16 -- 0.47…Teppei Okumura, Y. P. Jing, Cheng Li·Sep 22, 2008SaveLearn
Quasars Are Not Light-Bulbs: Testing Models of Quasar Lifetimes with the Observed Eddington Ratio DistributionWe use the observed distribution of Eddington ratios as a function of supermassive black hole (BH) mass to constrain models of AGN lifetimes and lightcurves. Given the observed AGN luminosity…Philip F. Hopkins, Lars Hernquist·Sep 22, 2008SaveLearn
Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS)(Abridged) We examine the X-ray luminosity scaling relations of 31 nearby galaxy clusters from the Representative XMM-Newton Cluster Structure Survey (REXCESS). The objects are selected in X-ray…G. W. Pratt, J. H. Croston, M. Arnaud et al.·Sep 22, 2008SaveLearn
Can we avoid dark energy?The idea that we live near the centre of a large, nonlinear void has attracted attention recently as an alternative to dark energy or modified gravity. We show that an appropriate void profile can…J. P. Zibin, A. Moss, D. Scott·Sep 22, 2008SaveLearn
Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisionsYoung massive stars in the central parsec of our Galaxy are best explained by star formation within at least one, and possibly two, massive self-gravitating gaseous discs. With help of numerical…Alexander Hobbs, Sergei Nayakshin·Sep 22, 2008SaveLearn
System Parameters for the Eclipsing B-Star Binary HD 42401I present results from an optical spectroscopic investigation of the binary system HD 42401 (V1388 Ori; B2.5 IV-V + B3 V). A combined analysis of V-band photometry and radial velocities indicates…S. J. Williams·Sep 22, 2008SaveLearn