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Astrophysics papers — page 5

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A k-essence Model Of Inflation, Dark Matter and Dark Energy
We investigate the possibility for k-essence dynamics to reproduce the primary features of inflation in the early universe, generate dark matter subsequently, and finally account for the…
Nilok Bose, A. S. MajumdarDec 22, 2008
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The isolated neutron star candidate 2XMM J104608.7-594306
Over the last decade, X-ray observations unveiled the existence of several classes of isolated neutron stars (INSs) which are radio-quiet or exhibit radio emission with properties much at variance…
A. M. Pires, C. Motch, R. Turolla et al.Dec 22, 2008
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Large-scale dynamos in rigidly rotating turbulent convection
The existence of large-scale dynamos in rigidly rotating turbulent convection without shear is studied using three-dimensional numerical simulations of penetrative rotating compressible convection.…
P. J. Käpylä, M. J. Korpi, A. BrandenburgDec 22, 2008
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The MiMeS Project: Magnetism in Massive Stars
The Magnetism in Massive Stars (MiMeS) Project is a consensus collaboration among the foremost international researchers of the physics of hot, massive stars, with the basic aim of understanding the…
G. A. Wade, E. Alecian, D. A. Bohlender et al.Dec 22, 2008
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AWAIC: A WISE Astronomical Image Co-adder
We describe a new image co-addition tool, AWAIC, to support the creation of a digital Image Atlas from the multiple frame exposures acquired with the Wide-field Infrared Survey Explorer (WISE). AWAIC…
Frank J. Masci, John W. FowlerDec 22, 2008
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Vetoing atmospheric neutrinos in a high energy neutrino telescope
We discuss the possibility to suppress downward atmospheric neutrinos in a high energy neutrino telescope. This can be achieved by vetoing the muon which is produced by the same parent meson decaying…
Stefan Schönert, Thomas K. Gaisser, Elisa Resconi et al.Dec 22, 2008
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Diffuse ionized gas in spiral galaxies and the disk-halo interaction
Thick layers of warm, low density ionized hydrogen (i.e., the warm ionized medium or WIM) in spiral galaxies provide direct evidence for an interaction between the disk and halo. The wide-spread…
R. J. Reynolds, L. M. Haffner, G. J. Madsen et al.Dec 22, 2008
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The GALEX View of Supernova Hosts
We exploit the accumulating, high-quality, multi-wavelength imaging data of nearby supernova (SN) hosts to explore the relationship between SN production and host galaxy evolution. The Galaxy…
James D. Neill, Mark Sullivan, Mark SeibertDec 22, 2008
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MHD Remote Numerical Simulations: Evolution of Coronal Mass Ejections
Coronal mass ejections (CMEs) are solar eruptions into interplanetary space of as much as a few billion tons of plasma, with embedded magnetic fields from the Sun's corona. These perturbations…
L. Hernandez-Cervantes, A. Santillan, A. R. Gonzalez-PonceDec 22, 2008
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The Connection between a Lyman Limit System, a very strong OVI Absorber, and Galaxies at z~0.203
With a column density log N(OVI) = 14.95+/-0.05, the OVI absorber at zabs~0.2028 observed toward the QSO PKS0312-77 (zem=0.223) is the strongest yet detected at z<0.5. At nearly identical redshift…
N. Lehner, J. X. Prochaska, H. A. Kobulnicky et al.Dec 22, 2008
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Studying ISM magnetic fields and turbulent regimes from polarimetric maps
Polarimeric maps have been used on the characterization of the magnetic field in molecular clouds. However, it is difficult to determine the 3-dimensional properties of these regions from the…
D. Falceta-Goncalves, A. Lazarian, G. KowalDec 22, 2008
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Recovering the real-space correlation function from photometric redshift surveys
Measurements of clustering in large-scale imaging surveys that make use of photometric redshifts depend on the uncertainties in the redshift determination. We have used light-cone simulations to show…
Pablo Arnalte-Mur, Alberto Fernández-Soto, Vicent J. Martínez et al.Dec 22, 2008
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Discovery of non-radial pulsations in the spectroscopic binary Herbig Ae star RS Cha
In this article we present a first discovery of non radial pulsations in both components of the Herbig Ae spectroscopic binary star RS Cha. The binary was monitored in quasi-continuous observations…
T. Böhm, W. Zima, C. Catala et al.Dec 22, 2008
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Towards millimeter VLBI
We discuss the present performance and the future perspectives of VLBI in the 3 mm to 0.85 mm observing bands (so called mm-VLBI). The availability of new telescopes and the recent technical…
T. P. Krichbaum, U. Bach, D. A. Graham et al.Dec 22, 2008
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Dark Matter Model Selection and the ATIC/PPB-BETS anomaly
We argue that we may be able to sort out dark matter models in which electrons are generated through the annihilation and/or decay of dark matter, by using a fact that the initial energy spectrum is…
Chuan-Ren Chen, Koichi Hamaguchi, Mihoko M. Nojiri et al.Dec 22, 2008
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Imaging Very High Energy Gamma-Ray Telescopes
The technique of gamma-ray astronomy at very high energies (VHE: > 100 GeV) with ground-based imaging atmospheric Cherenkov telescopes is described, the H.E.S.S. array in Namibia serving as example.…
Heinrich J. Voelk, Konrad BernloehrDec 22, 2008
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Double mode RR Lyrae stars in Omega Centauri
Aim: The aim of this work was to search for double mode pulsators among RR Lyr variables of globular cluster Omega Cen. Methods: We conducted a systematic frequency analysis of CASE photometry of…
A. Olech, P. MoskalikDec 22, 2008
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Measuring and calibrating Galactic synchrotron emission
Our position inside the Galaxy requires all-sky surveys to reveal its large-scale properties. The zero-level calibration of all-sky surveys differs from standard 'relative' measurements,…
Wolfgang Reich, Patricia ReichDec 22, 2008
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Time evolution of Wouthuysen-Field coupling
We study the Wouthuysen-Field coupling at early universe with numerical solutions of the integrodifferential equation describing the kinetics of photons undergoing resonant scattering. The numerical…
I. Roy, W. Xu, J. -M. Qiu et al.Dec 22, 2008
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Near Infrared Observations of the novae V2491 Cygni and V597 Puppis
We present results obtained from near-infrared JHK spectroscopic observations of novae V2491 Cyg and V597 Pup in the early declining phases of their 2007 and 2008 outbursts respectively. In both…
Sachindra Naik, D. P. K. Banerjee, N. M. AshokDec 22, 2008
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HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search
We report the detection of a candidate brown dwarf orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is a substellar…
Robert A. Wittenmyer, Michael Endl, William D. Cochran et al.Dec 22, 2008
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Negative feedback effects on star formation history and cosmic reionization
After considering the effects of negative feedback on the process of star formation, we explore the relationship between star formation process and the associated feedback, by investigating how the…
Lei Wang, Jirong Mao, Shouping Xiang et al.Dec 22, 2008
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The MiMeS Project: First Results
Massive stars are those stars with initial masses above about 8 times that of the sun, eventually leading to catastrophic explosions in the form of supernovae. These represent the most massive and…
J. H. Grunhut, E. Alecian, D. A. Bohlender et al.Dec 22, 2008
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Photometric and Spectroscopic Observations of V1280 Sco
Photometries of B, V, Rc, Ic, y, J, and Ks bands and low dispersion optical spectroscopic observations of Nova V1280 Sco, started soon after the outburst, are reported. We show that V1280 Sco is an…
Hiroyuki Naito, Sahori Mizoguchi, Akira Arai et al.Dec 22, 2008
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Curious Variables Experiment (CURVE). CCD photometry of active dwarf nova DI UMa
We report an analysis of photometric behaviour of DI UMa, an extremely active dwarf nova. The observational campaign (completed in 2007) covers five superoutbursts and four normal outbursts. We…
A. Rutkowski, A. Olech, M. Wiśniewski et al.Dec 21, 2008
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