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Astrophysics papers — page 19

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A photometric study of the southern Blazhko star SS For Unambiguous detection of quintuplet components
We present our analysis of photometric data in the Johnson B and V filter of the southern Blazhko star SS For. In parallel, we analyzed the V observations obtained with the ASAS-3 photometry of the…
Katrien Kolenberg, Elisabeth Guggenberger, Thebe Medupe et al.Dec 11, 2008
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Evolution of Anemone AR NOAA 10798 and the Related Geo-Effective Flares and CMEs
We present a detailed examination of the features of the Active Region (AR) NOAA 10798. This AR generated coronal mass ejections (CMEs) that caused a large geomagnetic storm on 24 August 2005 with…
Ayumi Asai, Kazunari Shibata, Takako T. Ishii et al.Dec 11, 2008
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The impact of the 18F(a,p)21Ne reaction on fluorine production in AGB stars
The recent experimental evaluation of the 18F(a,p)21Ne reaction rate, when considering its associated uncertainties, presented significant differences compared to the theoretical Hauser-Feshbach…
Amanda I. Karakas, Hye Young Lee, Maria Lugaro et al.Dec 11, 2008
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The Graininess of Dark Matter Haloes
We use the recently completed one billion particle Via Lactea II LambdaCDM simulation to investigate local properties like density, mean velocity, velocity dispersion, anisotropy, orientation and…
Marcel Zemp, Jürg Diemand, Michael Kuhlen et al.Dec 11, 2008
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Oscillations of the Inner Regions of Viscous Accretion Disks
Although quasi-periodic oscillations (QPOs) have been discovered in different X-ray sources, their origin is still a matter of debate. Analytical studies of hydrodynamic accretion disks have shown…
Chi-kwan ChanDec 11, 2008
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Numerical Studies of Weakly Stochastic Magnetic Reconnection
We study the effects of turbulence on magnetic reconnection using three-dimensional numerical simulations. This is the first attempt to test a model of fast magnetic reconnection proposed by Lazarian…
G. Kowal, A. Lazarian, E. T. Vishniac et al.Dec 11, 2008
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Statistics of Galactic Synchrotron and Dust Foregrounds: Spectra, PDFs and Higher-Order Moments
We present statistical analysis of diffuse Galactic synchrotron emission and polarized thermal emission from dust. Both Galactic synchrotron emission and polarized thermal emission from dust reflect…
Jungyeon Cho, A. LazarianDec 11, 2008
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A Wide-Field Study of the z~0.8 Cluster RX J0152.7-1357: the Role of Environment in the Formation of the Red-Sequence
[ABRIDGED] We present the first results from the largest spectroscopic survey to date of an intermediate redshift galaxy cluster, the z=0.834 cluster RX J0152.7-1357. We use the colors of galaxies,…
Shannon G. Patel, Daniel D. Kelson, Bradford P. Holden et al.Dec 10, 2008
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Exploring the Star Formation History of Elliptical Galaxies: Beyond Simple Stellar Populations with a New Estimator of Line Strengths
(Abridged) We study the stellar populations of 14 elliptical galaxies in the Virgo cluster. We propose an alternative approach to the standard side-band method to measure equivalent widths (EWs). Our…
Ben Rogers, Ignacio Ferreras, Reynier F. Peletier et al.Dec 10, 2008
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Redistributing hot gas around galaxies: do cool clouds signal a solution to the overcooling problem?
We present a pair of high-resolution smoothed particle hydrodynamics (SPH) simulations that explore the evolution and cooling behavior of hot gas around Milky-Way size galaxies. The simulations…
Tobias Kaufmann, James S. Bullock, Ariyeh H. Maller et al.Dec 10, 2008
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X-raying the Intergalactic OVI Absorbers
The observed intergalactic OVI absorbers at z>0 have been regarded as a significant reservoir of the ``missing baryons''. However, to fully understand how these absorbers contribute to the…
Y. Yao, T. M. Tripp, Q. D. Wang et al.Dec 10, 2008
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Periodic Variables in the Open Cluster NGC 2301
We present the results of a search for periodic variables within 4078 time-series light curves and an analysis of the period-color plane for stars in the field of the open cluster NGC2301. One…
Tuguldur Sukhbold, Steve B. HowellDec 10, 2008
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Alpha effect and turbulent diffusion from convection
(abridged) Aims: To study turbulent transport coefficients that describe the evolution of large-scale magnetic fields in turbulent convection. Methods: We use the test field method together with 3D…
P. J. Käpylä, M. J. Korpi, A. BrandenburgDec 10, 2008
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Cosmological Systematics Beyond Nuisance Parameters : Form Filling Functions
In the absence of any compelling physical model, cosmological systematics are often misrepresented as statistical effects and the approach of marginalising over extra nuisance systematic parameters…
T. D. Kitching, A. Amara, F. B. Abdalla et al.Dec 10, 2008
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Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b
The gaseous giant planets WASP-4b and WASP-5b are transiting 12 magnitude solar-type stars in the Southern hemisphere. The aim of the present work is to refine the parameters of these systems using…
M. Gillon, B. Smalley, L. Hebb et al.Dec 10, 2008
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The ANTARES Neutrino Telescope
The ANTARES underwater neutrino telescope, at a depth of 2475 m in the Mediterranean Sea, near Toulon, is taking data in its final configuration of 12 detection lines. Each line is equipped with 75…
G. GiacomelliDec 10, 2008
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The Challenge of Modelling Galactic Disks
Detailed models of galactic disk formation and evolution require knowledge about the initial conditions under which disk galaxies form, the boundary conditions that affect their secular evolution and…
Andreas BurkertDec 10, 2008
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Is there a GeV counterpart in the Fermi GBM events?
In this paper we report a possible GeV counterpart observed at ground level as muons (or "photo-muons") of two Fermi gamma burst monitor (GBM) events, trigger bn081120618 and trigger…
C. R. A. Augusto, C. E. Navia, K. H. Tsui et al.Dec 10, 2008
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Inelastic Dark Matter, Non-Standard Halos and the DAMA/LIBRA Results
The DAMA collaboration have claimed to detect particle dark matter (DM) via an annual modulation in their observed recoil event rate. This appears to be in strong disagreement with the null results…
John March-Russell, Christopher McCabe, Matthew McCulloughDec 10, 2008
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Relativistic Expansion of Magnetic Loops at the Self-similar Stage
We obtained self-similar solutions of relativistically expanding magnetic loops taking into account the azimuthal magnetic fields. We neglect stellar rotation and assume axisymmetry and a purely…
Hiroyuki R. Takahashi, Eiji Asano, Ryoji MatsumotoDec 10, 2008
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An accretion disc-corona model for X-ray spectra of active galactic nuclei
The hard X-ray emission of active galactic nuclei (AGN) is believed to originate from the hot coronae above the cold accretion discs. The hard X-ray spectral index is found to be correlated with the…
Xinwu CaoDec 10, 2008
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Discovery of four gravitational lensing systems by clusters in the SDSS DR6
We report the discovery of 4 strong gravitational lensing systems by visual inspections of the Sloan Digital Sky Survey images of galaxy clusters in Data Release 6 (SDSS DR6). Two of the four systems…
Zhong-Lue Wen, Jin-Lin Han, Xiang-Yang Xu et al.Dec 10, 2008
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New prediction of extragalactic GeV gamma-ray emission from radio lobes of young AGN jets
We present a new prediction of GeV γ-ray emission from radio lobes of young AGN jets. In the previous work of Kino et al. (2007), MeV γ-ray bremsstrahlung emission was predicted from young…
M. Kino, H. Ito, N. Kawakatu et al.Dec 10, 2008
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MRC B0319-454: Probing the large-scale structure with a giant radio galaxy
We present an investigation of the relationships between the radio properties of a giant radio galaxy MRC B0319-454 and the surrounding galaxy distribution with the aim of examining the influence of…
V. Safouris, R. Subrahmanyan, G. V. Bicknell et al.Dec 10, 2008
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Modeling H2 Fluorescence in Planetary Atmospheres with Partial Frequency Redistribution
We present the modeling of partial frequency redistribution (PRD) effects for the fluorescent emission lines of molecular hydrogen, the general computational approximations, and the applications to…
R. E. Lupu, P. D. Feldman, S. R. McCandliss et al.Dec 10, 2008
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