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Astrophysics papers — page 42

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Near-Infrared Imaging Polarimetry of S106 Cluster-Forming Region with SIRPOL
We present the results of wide-field JHKs polarimetry toward the HII region S106 using the IRSF (Infrared Survey Facility) telescope. Our polarimetry data revealed an extended (up to ~ 5')…
Hiro Saito, Motohide Tamura, Ryo Kandori et al.Nov 20, 2008
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Formation of relativistic MHD jets: stationary state solutions & numerical simulations
We discuss numerical results of relativistic magnetohydrodynamic (MHD) jet formation models. We first review some examples of stationary state solutions treating the collimation and acceleration…
Christian Fendt, Elisabetta MemolaNov 20, 2008
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Using ages and kinematic traceback: the origin of young local associations
Over the last decade, several groups of young (mainly low-mass) stars have been discovered in the solar neighbourhood (closer than ~100 pc), thanks to cross-correlation between X-ray, optical…
D. Fernandez, F. Figueras, J. TorraNov 20, 2008
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The gravitational lens J1131-1231 - How to avoid missing an opportunity
So far the lens J1131-1231 has been studied only at optical and X-ray wavelengths. A detection in the radio was almost missed as a result of an incorrect position and archive problems. A direct…
Olaf Wucknitz, Filomena VolinoNov 20, 2008
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On the origin of eccentricities among extrasolar planets
Most observed extrasolar planets have masses similar to, but orbits very different from, the gas giants of our solar system. Many are much closer to their parent stars than would have been expected…
Daniel Malmberg, Melvyn B. DaviesNov 20, 2008
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Magnetohydrodynamic jets from different magnetic field configurations
Using axisymmetric MHD simulations we investigate how the overall jet formation is affected by a variation in the disk magnetic flux profile and/or the existence of a central stellar magnetosphere.…
Christian FendtNov 20, 2008
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The L723 low mass star forming protostellar system: resolving a double core
We present 1.35 mm SMA observations around the low-mass Class 0 source IRAS 19156+1906, at the the center of the L723 dark cloud. We detected emission from dust as well as emission from H2CO, DCN and…
J. M. Girart, R. Rao, R. EstalellaNov 20, 2008
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Epeak estimator for Gamma-Ray Bursts Observed by the Swift Burst Alert Telescope
We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correlation is between…
T. Sakamoto, G. Sato, L. Barbier et al.Nov 20, 2008
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Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL
The microquasar 1E 1740.7-2942 is observed with Integral since Spring 2003. Here, we report on the source high energy behaviour by using the first three years of data collected with SPI and IBIS…
L. Bouchet, M. Del Santo, E. Jourdain et al.Nov 20, 2008
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Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3
We present simultaneous dual-frequency radio observations of Cygnus X-3 during a phase of low-level activity. We constrain the minimum variability timescale to be 20 minutes at 43 GHz and 30 minutes…
James C. A. Miller-Jones, Michael P. Rupen, Marc Türler et al.Nov 20, 2008
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Spectra of Nearby Galaxies Measured with a New Very Broadband Receiver
Three-millimeter-wavelength spectra of a number of nearby galaxies have been obtained at the Five College Radio Astronomy Observatory (FCRAO) using a new, very broadband receiver. This instrument,…
Gopal Narayanan, Ronald L. Snell, Neal R. Erickson et al.Nov 20, 2008
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Distinguishing Between Dark Matter and Pulsar Origins of the ATIC Electron Spectrum With Atmospheric Cherenkov Telescopes
Recent results from the Advanced Thin Ionization Calorimeter (ATIC) balloon experiment have identified the presence of a spectral feature between approximately 300 and 800 GeV in the cosmic ray…
Jeter Hall, Dan HooperNov 20, 2008
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Multifrequency study of the ring nebula SG13
We investigate the morphology and kinematics of the interstellar medium in the environs of the open cluster Mrk50, which includes the Wolf-Rayet star WR157 and a number of early B-type stars. The…
J. Vasquez, C. E. Cappa, S. PineaultNov 20, 2008
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A hydrodynamical analysis of the steady-state shock model
In this article some of the hydrodynamical (HD) aspects of steady shocks as described by the steady-state shock model are reviewed and discussed. It is found that, at least in some of the contexts in…
A. Preite MartinezNov 20, 2008
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Photometric redshifts for the CFHTLS T0004 Deep and Wide fields
We compute photometric redshifts based on the template-fitting method in the fourth public release of the Canada-France-Hawaii Telescope Legacy Survey. This unique multi-colour catalogue comprises…
J. Coupon, O. Ilbert, M. Kilbinger et al.Nov 20, 2008
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Magnetic Fields of Nearby Active Galactic Nuclei and Correlation of the Highest-Energy Cosmic Rays with their Positions
The correlation between the pointing direction of ultra high energy cosmic rays and AGN observed by the Pierre Auger Collaboration is explained in the framework of acceleration process in AGN. This…
M. Yu. Piotrovich, Yu. N. Gnedin, T. M. NatsvlishviliNov 20, 2008
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Internal shocks model for microquasar jets
We present an internal shocks model to investigate particle acceleration and radiation production in microquasar jets. The jet is modelled with discrete ejecta at various time intervals. These ejecta…
Omar Jamil, Rob Fender, Christian KaiserNov 20, 2008
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Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe
Aims: Taking advantage of the forthcoming Catalog of the HETE-2 mission, the aim of this paper is to evaluate the main properties of HETE-2 GRBs - the Epeak, the T90 and the Eiso - in their source…
A. Pélangeon, J. -L. Atteia, Y. E. Nakagawa et al.Nov 20, 2008
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A dense disk of dust around the born-again Sakurai's object
In 1996, Sakurai's object (V4334 Sgr) suddenly brightened in the centre of a faint Planetary Nebula (PN). This very rare event was interpreted as the reignition of a hot white dwarf that caused a…
Olivier Chesneau, G. C. Clayton, F. Lykou et al.Nov 20, 2008
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On the frequency of N2H+ and N2D+
Context : Dynamical studies of prestellar cores search for small velocity differences between different tracers. The highest radiation frequency precision is therefore required for each of these…
Laurent Pagani, Fabien Daniel, Marie-Lise DubernetNov 20, 2008
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Age spreads in star forming regions?
Rotation periods and projected equatorial velocities of pre-main-sequence (PMS) stars in star forming regions can be combined to give projected stellar radii. Assuming random axial orientation, a…
R. D. JeffriesNov 20, 2008
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Formation of the off-center bar in the Large Magellanic Cloud: A collision with a dark satellite ?
Recent observations on structural properties of the Large Magellanic Cloud (LMC) based on the Deep Near-Infrared Southern Sky Survey (DENIS) and Two Micron All-Sky Survey (2MASS) have revealed that…
Kenji BekkiNov 20, 2008
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Homogeneous studies of transiting extrasolar planets. II. Physical properties
I present an homogeneous determination of the physical properties of 14 transiting extrasolar planetary systems for which good data are available. The input quantities for each system are the results…
John SouthworthNov 20, 2008
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Galactic Parameters from Whole Sky 2MASS Star Count
The whole sky differential star counts (DSC) with 1 degree resolution are retrieved from 2MASS online data service. Galaxy with double exponential thin and thick disks and a single power law…
C. K. Chang, C. M. Ko, T. H. PengNov 20, 2008
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Differential rotation and meridional circulation in global models of solar convection
In the outer envelope of the Sun and in other stars, differential rotation and meridional circulation are maintained via the redistribution of momentum and energy by convective motions. In order to…
M. S. MieschNov 20, 2008
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