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A New Model For Vela Jr. Supernova Remnant
We consider Vela Jr. as being the old Supernova Remnant (SNR) at the beginning of the transition from adiabatic to radiative stage of evolution. According to our model, Vela Jr. is situated outside…
Igor TelezhinskyDec 25, 2008
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Band-power reconstruction of the primordial fluctuation spectrum by the maximum likelihood reconstruction method
The primordial curvature fluctuation spectrum is reconstructed by the maximum likelihood reconstruction method using the five-year Wilkinson Microwave Anisotropy Probe data of the cosmic microwave…
Ryo Nagata, Jun'ichi YokoyamaDec 25, 2008
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Adiabatic expansion and magnetic fields in AGN jets
Results of high-resolution simultaneous multi-frequency 8.1-15.4 GHz VLBA polarimetric observations of relativistic jets in active galactic nuclei (the MOJAVE-2 project) are analyzed. We compare…
A. B. Pushkarev, Y. Y. Kovalev, A. P. LobanovDec 25, 2008
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Probing parsec scale jets in AGN with geodetic VLBI
We report on an ongoing effort to image active galactic nuclei simultaneously observed at 2.3 and 8.6 GHz in the framework of a long-term VLBI project RDV (Research and Development - VLBA) started in…
A. B. Pushkarev, Y. Y. KovalevDec 25, 2008
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Search for the magnetic field of the O7.5 III star xi Persei
Cyclical wind variability is an ubiquitous but as yet unexplained feature among OB stars. The O7.5 III(n)((f)) star xi Persei is the brightest representative of this class on the Northern hemisphere.…
H. F. Henrichs, R. S. Schnerr, J. A. de Jong et al.Dec 25, 2008
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The magnetic field of the B3V star 16 Pegasi
The Slowly Pulsating B3V star 16 Pegasi was discovered by Hubrig (2006) to be magnetic, based on low-resolution spectropolarimetric observations with FORS1 at the VLT. We have confirmed the presence…
H. F. Henrichs, C. Neiner, R. S. Schnerr et al.Dec 25, 2008
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Scenarios for GCRT J1745-3009
I discuss several scenarios to explain properties of the radio transient source GCRT J1745-3009. Namely, a highly magnetized neutron star on the propeller or georotator stage, a transient propeller,…
S. B. PopovDec 25, 2008
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Near-infrared bulge-disc correlations of lenticular galaxies
We consider the luminosity and environmental dependence of structural parameters of lenticular galaxies in the near-infrared K band. Using a two-dimensional galaxy image decomposition technique, we…
Sudhanshu Barway, Yogesh Wadadekar, Ajit K. Kembhavi et al.Dec 24, 2008
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Do non-relativistic neutrinos constitute the dark matter?
The dark matter of the Abell 1689 galaxy cluster is modeled by thermal, non-relativistic gravitating fermions and its galaxies and X-ray gas by isothermal distributions. A fit yields a mass of…
Th. M. NieuwenhuizenDec 24, 2008
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New BVRI photometry results on KBOs from the ESO VLT
Photometric surveys of transNeptunian objects (TNOs) and Centaurs have suggested possible correlations between some orbital parameters and surface colors of classical objects, scattered disk objects…
P. Santos-Sanz, J. L. Ortiz, L. Barrera et al.Dec 24, 2008
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Nodeless differentially rotational Alfvén oscillations of crustal solid-state plasma in quaking neutron star
The two-component, core-crust, model of a neutron star with homogenous internal and dipolar external magnetic field is studied responding to quake-induced perturbation by substantially nodeless…
S. I. Bastrukov, H. -K. Chang, I. V. Molodtsova et al.Dec 24, 2008
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Probing Dark Energy at Galactic and Cluster Scales
We investigate dark matter halo properties as a function of a time--varying dark energy equation of state. The dynamics of the collapse of the halo is governed by the form of the quintessence…
David F. MotaDec 24, 2008
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Strange Quark stars: Observations & Speculations
Two kinds of difficulties have challenged the physics community for many years: (1) knowing nature's building blocks (particle physics) and (2) understanding interacting many-body systems…
Renxin XuDec 24, 2008
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Effects of Minor Mergers on Coalescence of a Supermassive Black Hole Binary
We study the possibility that minor mergers resolve the loss cone depletion problem, which is the difficulty occured in the coalescence process of the supermassive black hole (SMBH) binary, by…
Hidenori Matsui, Asao HabeDec 24, 2008
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Intensity Distribution and Luminosity Function of the Swift Gamma-Ray Bursts
Using the sample of long Gamma-ray bursts (GRBs) detected by Swift-BAT before June 2007, we measure the cumulative distribution of the peak photon fluxes (log N - log P) of the Swift bursts. Compared…
Xinyu DaiDec 24, 2008
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Model of Reconnection of Weakly Stochastic Magnetic Field and its Testing
Astrophysical fluids are generically turbulent, which means that frozen-in magnetic fields are, at least, weakly stochastic. Therefore realistic studies of astrophysical magnetic reconnection should…
A. Lazarian, E. Vishniac, G. KowalDec 24, 2008
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Grain alignment induced by radiative torques: effects of internal relaxation of energy and complex radiation fields
Earlier studies of grain alignment dealt mostly with interstellar grains that have strong internal relaxation of energy which aligns grain axis of maximum moment of inertia with respect to grain's…
Thiem Hoang, Alex LazarianDec 24, 2008
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Null geodesics and observational cosmology
The Universe is not isotropic or spatially homogeneous on local scales. The averaging of local inhomogeneities in general relativity can lead to significant dynamical effects on the evolution of the…
A. A. ColeyDec 24, 2008
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On Dark Energy and Dark Matter (Part I)
Phenomena currently attributed to Dark Energy (DE) and Dark Matter (DM) are merely a result of the interplay between gravitational energy density, generated by the contraction of space by matter, and…
Shlomo Barak, Elia M LeibowitzDec 24, 2008
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The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
The ACS Survey of Galactic Globular Clusters is a Hubble Space Telescope (HST) Treasury program designed to provide a new large, deep and homogeneous photometric database. Based on observations from…
Antonio Marin-Franch, Antonio Aparicio, Giampaolo Piotto et al.Dec 24, 2008
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Nonlinear Density Fluctuation Field Theory for Large Scale Structure
We develop the effective field theory of density fluctuations for a Newtonian self-gravitating N-body system in quasi-equilibrium, apply it to a homogeneous universe with small density fluctuations.…
Yang Zhang, Haixing MiaoDec 24, 2008
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High Inclination Planets in Multistellar Systems
The Kozai mechanism often destabilises high inclination orbits. It couples changes in the eccentricity and inclination, and drives high inclination, circular orbits to low inclination, eccentric…
P. E. Verrier, N. W. EvansDec 24, 2008
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Orbital Phase Spectroscopy of four High Mass X-ray Binary Pulsars to Study the Stellar Wind of the Companion
Our work focuses on a comprehensive orbital phase dependent spectroscopy of the four High Mass X-ray Binary Pulsars (HMXBPs) 4U 1538-52, GX 301-2, OAO 1657-415 & Vela X-1. We hereby report the…
Sachindra Naik, Uddipan Mukherjee, Biswajit Paul et al.Dec 24, 2008
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Explaining the Orbits of the Galactic Center S-Stars
The young stars near the supermassive black hole at the galactic center follow orbits that are nearly random in orientation and that have an approximately thermal distribution of eccentricities, N(e)…
David Merritt, Alessia Gualandris, Seppo MikkolaDec 24, 2008
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Small-scale solar magnetic fields
As we resolve ever smaller structures in the solar atmosphere, it has become clear that magnetism is an important component of those small structures. Small-scale magnetism holds the key to many…
A. G. de Wijn, J. O. Stenflo, S. K. Solanki et al.Dec 24, 2008
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