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Astrophysics papers — page 33

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Dissociation of the benzene molecule by UV and soft X-rays in circumstellar environment
Benzene molecules, present in the proto-planetary nebula CRL 618, are ionized and dissociated by UV and X-ray photons originated from the hot central star and by its fast wind. Ionic species and free…
H. M. Boechat-Roberty, R. Neves, S. Pilling et al.Nov 30, 2008
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Degeneracy, the virial theorem, and stellar collapse
Formulae for the energies of degenerate non-relativistic and ultra-relativistic Fermi gases play multiple roles in simple arguments related to the collapse of a stellar core to a neutron star. These…
Christian Y. CardallNov 29, 2008
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The open cluster Pismis 11 and the very luminous blue supergiant HD 80077
(Abridged) The very luminous blue supergiant HD 80077 has been claimed to be a member of the young open cluster Pismis 11, and hence a hypergiant. We obtained UBVRI photometry of the cluster field…
Amparo Marco, Ignacio NegueruelaNov 29, 2008
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Overview of the Orion Complex
The Orion star formation complex is the nearest region of on-going star formation that continues to produce both low and high mass stars. Orion is discussed in the larger context of star formation in…
John BallyNov 29, 2008
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Magnetic fingerprints of solar and stellar oscillations
Waves connect all the layers of the Sun, from its interior to the upper atmosphere. It is becoming clear now the important role of magnetic field on the wave propagation. Magnetic field modifies…
Elena KhomenkoNov 29, 2008
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Simulations of waves in sunspots
Magnetic field modifies the properties of waves in a complex way. Significant advances has been made recently in our understanding of the physics of waves in solar active regions with the help of…
Elena KhomenkoNov 29, 2008
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A Smaller Radius for the Transiting Exoplanet WASP-10b
We present photometry of WASP-10 during the transit of its short-period Jovian planet. We employed the novel PSF-shaping capabilities the OPTIC camera mounted on the UH 2.2m telescope to achieve a…
John A. Johnson, Joshua N. Winn, Nicole E. Cabrera et al.Nov 29, 2008
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The Role of Cold Flows in the Assembly of Galaxy Disks
We use high resolution cosmological hydrodynamical simulations to demonstrate that cold flow gas accretion, particularly along filaments, modifies the standard picture of gas accretion and cooling…
A. M. Brooks, F. Governato, T. Quinn et al.Nov 29, 2008
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XMM-Newton discovery of 2.6 s pulsations in the soft gamma-ray repeater SGR 1627-41
After nearly a decade of quiescence, the soft gamma-ray repeater SGR 1627-41 reactivated on 2008 May 28 with a bursting episode followed by a slowly decaying enhancement of its persistent emission.…
P. Esposito, A. Tiengo, S. Mereghetti et al.Nov 28, 2008
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The dynamics of satellite disruption in cold dark matter haloes
We investigate the physical mechanisms of tidal heating and satellite disruption in cold dark matter host haloes using N-body simulations based on cosmological initial conditions. We show the…
Jun-Hwan Choi, Martin D. Weinberg, Neal KatzNov 28, 2008
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Modeling the cosmological co-evolution of supermassive black holes and galaxies: II. The clustering of quasars and their dark environment
We use semi-analytic modeling on top of the Millennium simulation to study the joint formation of galaxies and their embedded supermassive black holes. Our goal is to test scenarios in which black…
Silvia Bonoli, Federico Marulli, Volker Springel et al.Nov 28, 2008
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On the non-Gaussianity from Recombination
The non-linear effects operating at the recombination epoch generate a non-Gaussian signal in the CMB anisotropies. Such a contribution is relevant because it represents a major part of the…
Nicola Bartolo, Antonio RiottoNov 28, 2008
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Non-Gaussianity in Cosmic Microwave Background Temperature Fluctuations from Cosmic (Super-)Strings
We compute analytically the small-scale temperature fluctuations of the cosmic microwave background from cosmic (super-)strings and study the dependence on the string intercommuting probability P.…
Keitaro Takahashi, Atsushi Naruko, Yuuiti Sendouda et al.Nov 28, 2008
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Stellar population analysis on local infrared-selected galaxies
To study the stellar population of local infrared galaxies, which contain star-forming galaxies, composite galaxies, LINERs, and Seyfert 2s. We also want to find whether infrared luminosity and…
X. Y. Chen, Y. C. Liang, F. Hammer et al.Nov 28, 2008
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Six Puzzles for LCDM Cosmology
The LCDM cosmological model is a well defined, simple and predictive model which is consistent with the majority of current cosmological observations. Despite of these successes there are specific…
L. PerivolaropoulosNov 28, 2008
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The nature of p-modes and granulation in HD 49933 observed by CoRoT
Context: Recent observations of HD49933 by the space-photometric mission CoRoT provide photometric evidence of solar type oscillations in a star other than our Sun. The first published reduction,…
T. Kallinger, M. Gruberbauer, D. B. Guenther et al.Nov 28, 2008
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Observational constraints on thawing quintessence models
We use a dynamical systems approach to study thawing quintessence models, using a multi-parameter extension of the exponential potential which can approximate the form of typical thawing potentials.…
Timothy G Clemson, Andrew R LiddleNov 28, 2008
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Oscillating red giants in the CoRoT exo-field: Asteroseismic mass and radius determination
Context. Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored. Although…
T. Kallinger, W. W. Weiss, C. Barban et al.Nov 28, 2008
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A Turbulent Model of Gamma-Ray Burst Variability
A popular paradigm to explain the rapid temporal variability observed in gamma-ray burst (GRB) lightcurves is the internal shock model. We propose an alternative model in which the radiating fluid in…
Ramesh Narayan, Pawan KumarNov 28, 2008
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Protodiscs around Hot Magnetic Rotator Stars
We develop equations and obtain solutions for the structure and evolution of a protodisc region that is initially formed with no radial motion and super-Keplerian rotation speed when wind material…
M. Maheswaran, J. P. CassinelliNov 28, 2008
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2D non-LTE radiative modelling of He I spectral lines formed in solar prominences
The diagnosis of new high-resolution spectropolarimetric observations of solar prominences made in the visible and near-infrared mainly, requires a radiative modelling taking into account for both…
L. Leger, F. PaletouNov 28, 2008
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The Upper Atmosphere of HD17156b
HD17156b is a newly-found transiting extrasolar giant planet (EGP) that orbits its G-type host star in a highly eccentric orbit (e~0.67) with an orbital semi-major axis of 0.16 AU. Its period, 21.2…
T. T. Koskinen, A. D. Aylward, S. MillerNov 28, 2008
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Is J 133658.3-295105 a Radio Source at z >= 1.0 or at the Distance of M 83?
We present Gemini optical imaging and spectroscopy of the radio source J 133658.3-295105. This source has been suggested to be the core of an FR II radio source with two detected lobes. J…
Horacio Dottori, Ruben J. Diaz, Damian MastNov 28, 2008
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Gemini/GMOS search of massive binaries in the ionizing cluster of 30 Dor
If binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties like the cluster age, IMF and dynamical mass. Making use of the…
Guillermo Bosch, Elena Terlevich, Roberto TerlevichNov 28, 2008
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High Energy Neutrino Astronomy: Status and Perspectives
The year 2008 has witnessed remarkable steps in developing high energy neutrino telescopes. IceCube at the South Pole has been deployed with 40 of its planned 80 strings and reached half a cubic…
Christian SpieringNov 28, 2008
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