Morphology and hardness ratio exploitation under limited statisticsGamma-ray astronomy has produced for several years now sky maps for low photon statistics, non-negligible background and comparatively poor angular resolution. Quantifying the significance of spatial…A. -C. Clapson, M. Dyrda, D. Nekrassov et al.·Dec 19, 2008SaveLearn
Chemical evolution of high-mass stars in close binaries. I. The eclipsing binary V453 CygniThe eclipsing and double-lined spectroscopic binary system V453 Cygni consists of two early B-type stars, one of which is nearing the terminal age main sequence and one which is roughly halfway…K. Pavlovski, J. Southworth·Dec 19, 2008SaveLearn
Simultaneous H.E.S.S. and Chandra observations of Sagittarius A* during an X-ray flareThe rapidly varying (~10 minute timescale) non-thermal X-ray emission observed from Sgr A* implies that particle acceleration is occuring close to the event horizon of the supermassive black hole.…H. E. S. S. Collaboration, :, F. Aharonian·Dec 19, 2008SaveLearn
A multiwavelength investigation of the massive eclipsing binary Cyg OB2 #5The properties of the early-type binary Cyg OB2 #5 have been debated for many years and spectroscopic and photometric investigations yielded conflicting results. We have attempted to constrain the…N. Linder, G. Rauw, J. Manfroid et al.·Dec 19, 2008SaveLearn
An Explicit Scheme for Incorporating Ambipolar Diffusion in a Magnetohydrodynamics CodeWe describe a method for incorporating ambipolar diffusion in the strong coupling approximation into a multidimensional magnetohydrodynamics code based on the total variation diminishing scheme.…Eunwoo Choi, Jongsoo Kim, Paul J. Wiita·Dec 19, 2008SaveLearn
The Galactic bulge as seen in optical surveysThe bulge is a region of the Galaxy of tremendous interest for understanding galaxy formation. However measuring photometry and kinematics in it raises several inherent issues, such as severe…C. Reyle, D. J. Marshall, M. Schultheis et al.·Dec 19, 2008SaveLearn
The ultracool eld dwarfs luminosity function from the Canada-France Brown Dwarf SurveyThe Canada-France Brown Dwarf Survey is a wide eld survey for cool brown dwarfs conducted with the MegaCam camera on the CFHT telescope. Our objectives are to nd ultracool brown dwarfs and to…C. Reyle, P. Delorme, X. Delfosse et al.·Dec 19, 2008SaveLearn
The Milky Way's external disc constrained by 2MASS star countsContext. Thanks to recent large scale surveys in the near infrared such as 2MASS, the galactic plane that most suffers from extinction is revealed and its overall structure can be studied. Aims. This…C. Reyle, D. J. Marshall, A. C. Robin et al.·Dec 19, 2008SaveLearn
Time-evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball DynamicsWe perform a time-resolved spectral analysis of bright, long Gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Thanks to the large effective area of the WAM, we can investigate the time…Masanori Ohno, Kunihito Ioka, Kazutaka Yamaoka et al.·Dec 19, 2008SaveLearn
A census of molecular hydrogen outflows and their sources along the Orion A molecular ridge: characteristics and overall distributionWe present wide-field near-IR images of Orion A. K and H2 1-0S(1) images of a contiguous 8 sqr degree region are compared to photometry from Spitzer and dust-continuum maps obtained with MAMBO and…C. J. Davis, D. Froebrich, T. Stanke et al.·Dec 19, 2008SaveLearn
C/O white dwarfs of very low mass: 0.33-0.5 MoThe standard lower limit for the mass of white dwarfs (WDs) with a C/O core is roughly 0.5 Mo. In the present work we investigated the possibility to form C/O WDs with mass as low as 0.33 Mo. Both…P. G. Prada Moroni, O. Straniero·Dec 19, 2008SaveLearn
Motivations for Imaging Spectroscopy at Dome CAntarctica offers unique conditions for ground-based observations, such as low sky background in the infrared, improved seeing, and low turbulence and scintillation noise. These properties are…Andreas Kelz·Dec 19, 2008SaveLearn
HNCO abundances in galaxies: Tracing the evolutionary state of starburstsThe chemistry in the central regions of galaxies is expected to be strongly influenced by their nuclear activity. To find the best tracers of nuclear activity is of key importance to understand the…Sergio Martin, J. Martin-Pintado, R. Mauersberger·Dec 19, 2008SaveLearn
Non-Gaussianities from Perturbing RecombinationWe approximately compute the bispectrum induced on the CMB temperature by fluctuations in the standard recombination epoch. Of all the second order sources that can induce non-Gaussianity during…Leonardo Senatore, Svetlin Tassev, Matias Zaldarriaga·Dec 18, 2008SaveLearn
Enabling Next Generation Dark Energy and Epoch of Reionization Radio Observatories with the MOFF CorrelatorProposed 21 cm cosmology observatories for studying the epoch of reionization (z ~6-15) and dark energy (z ~0-6) envision compact arrays with tens of thousands of antenna elements. Fully correlating…Miguel F. Morales·Dec 18, 2008SaveLearn
Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBsWe present a homogeneous X-ray analysis of all 318 Gamma Ray Bursts detected by the X-ray Telescope on the Swift satellite up to 2008 July 23; this represents the largest sample of X-ray GRB data…P. A. Evans, A. P. Beardmore, K. L. Page et al.·Dec 18, 2008SaveLearn
Nickel-Rich Outflows from Accretion Disks Formed by the Accretion-Induced Collapse of White DwarfsA white dwarf (WD) approaching the Chandrasekhar mass may in several cases undergo accretion-induced collapse (AIC) to a neutron star (NS) before a thermonuclear explosion ensues. It has generally…B. D. Metzger, A. L. Piro, E. Quataert·Dec 18, 2008SaveLearn
The origin of the diffuse non-thermal X-ray and radio emission in the Ophiuchus cluster of galaxiesWe present high resolution 240 and 607 MHz GMRT radio observations, complemented with 74 MHz archival VLA radio observations of the Ophiuchus cluster of galaxies, whose radio mini-halo has been…Miguel A. Perez-Torres, Fabio Zandanel, Martin A. Guerrero et al.·Dec 18, 2008SaveLearn
A multi-wavelength survey of AGN in the XMM-LSS field: I. Quasar selection via the KX techniqueAIMS: We present a sample of candidate quasars selected using the KX-technique. The data cover 0.68 deg2 of the X-ray Multi-Mirror (XMM) Large-Scale Structure (LSS) survey area where overlapping…Th. Nakos, J. P. Willis, S. Andreon et al.·Dec 18, 2008SaveLearn
Photo-z optimization for measurements of the BAO radial directionBaryon Acoustic Oscillations (BAO) in the radial direction offer a method to directly measure the Universe expansion history, and to set limits to space curvature when combined to the angular BAO…Daniel Roig, Licia Verde, Jordi Miralda-Escude et al.·Dec 18, 2008SaveLearn
Oscillations of Rapidly Rotating Superfluid StarsUsing time evolutions of the relevant linearised equations we study non-axisymmetric oscillations of rapidly rotating and superfluid neutron stars. We consider perturbations of Newtonian axisymmetric…Andrea Passamonti, Brynmor Haskell, Nils Andersson·Dec 18, 2008SaveLearn
Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature AnisotropiesWe study the effect of primordial isocurvature perturbations on non-Gaussian properties of CMB temperature anisotropies. We consider generic forms of the non-linearity of isocurvature perturbations…Chiaki Hikage, Kazuya Koyama, Takahiko Matsubara et al.·Dec 18, 2008SaveLearn
A new approach to bulk viscosity in strange quark matter at high densitiesA new method is proposed to compute the bulk viscosity in strange quark matter at high densities. Using the method it is straightforward to prove that the bulk viscosity is positive definite, which…Shou-wan Chen, Hui Dong, Qun Wang·Dec 18, 2008SaveLearn
The Statistics of Radio Astronomical Polarimetry: Bright Sources and High Time ResolutionA four-dimensional statistical description of electromagnetic radiation is developed and applied to the analysis of radio pulsar polarization. The new formalism provides an elementary statistical…W. van Straten·Dec 18, 2008SaveLearn
High Energy Neutrino TelescopesThis paper presents a review of the history, motivation and current status of high energy neutrino telescopes. Many years after these detectors were first conceived, the operation of kilometer-cubed…K. D. Hoffman·Dec 18, 2008SaveLearn