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Astrophysics papers — page 58

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Luminosity of a quark star undergoing torsional oscillations and the problem of gamma ray bursts
We discuss whether the winding-up of the magnetic field by differential rotation in a new-born quark star can produce a sufficiently-high, energy, emission rate of sufficiently long duration to…
J. Heyvaerts, S. Bonazzola, M. Bejger et al.Nov 7, 2008
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Measurement of acoustic properties of South Pole ice for neutrino astronomy
South Pole ice is predicted to be the best medium for acoustic neutrino detection. Moreover, ice is the only medium in which all three dense-medium detection methods (optical, radio, and acoustic)…
Justin VandenbrouckeNov 7, 2008
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Translational Invariance and the Anisotropy of the Cosmic Microwave Background
Primordial quantum fluctuations produced by inflation are conventionally assumed to be statistically homogeneous, a consequence of translational invariance. In this paper we quantify the potentially…
Sean M. Carroll, Chien-Yao Tseng, Mark B. WiseNov 7, 2008
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Prompt GeV emission in the synchrotron self-Compton model for Gamma-Ray Bursts
The detection in 10 bursts of an optical counterpart emission (i.e. during the prompt GRB phase) that is 10-10000 brighter than the extrapolation of the burst spectrum to optical frequencies suggests…
A. PanaitescuNov 7, 2008
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A Photometrically and Morphologically Variable Infrared Nebula in L483
We present narrow and broad K-band observations of the Class 0/I source IRAS 18148-0440 that span 17 years. The infrared nebula associated with this protostar in the L483 dark cloud is both…
Michael Connelley, Klaus Hodapp, Gary FullerNov 7, 2008
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Photometry and Spin Rate Distribution of Small-Sized Main Belt Asteroids
Photometry results of 32 asteroids are reported from only seven observing nights on only seven fields, consisting of 34.11 cumulative hours of observations. The data were obtained with a wide-field…
D. Polishook, N. BroschNov 7, 2008
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Uncertainties in Theoretical HeI Emissivities: HII Regions, Primordial Abundance, and Cosmological Recombination
A number of recent works in astronomy and cosmology have relied upon theoretical He I emissivities, but we know of no effort to quantify the uncertainties in the atomic data. We analyze and assign…
R. L. Porter, G. J. Ferland, K. B. MacAdam et al.Nov 7, 2008
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Bayesian modelling of clusters of galaxies from multi-frequency pointed Sunyaev--Zel'dovich observations
We present a Bayesian approach to modelling galaxy clusters using multi-frequency pointed observations from telescopes that exploit the Sunyaev--Zel'dovich effect. We use the recently developed…
F. Feroz, M. P. Hobson, J. T. L. Zwart et al.Nov 7, 2008
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TeV Gamma-ray Astronomy: The Story So Far
A snapshot is presented of the present status of our knowledge of the TeV gamma-ray universe. Emphasis is put on observations made using the imaging atmospheric Cherenkov technique. The capabilities…
Trevor C. WeekesNov 7, 2008
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Shell model half-lives for r-process N=82 nuclei
We have performed shell-model calculations of the half-lives and neutron-branching probabilities of the r-process waiting point nuclei at the magic neutron number N=82. These new calculations use a…
J. J. Cuenca-Garcia, G. Martinez-Pinedo, K. Langanke et al.Nov 7, 2008
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The Wouthuysen-Field effect in a clumpy intergalactic medium
We show that, due to the high optical depth of the intergalactic medium to Lyman-alpha photons before the Epoch of Reionization, the Lyman-alpha scattering rate responsible for the Wouthuysen-Field…
Jonathan Higgins, Avery MeiksinNov 7, 2008
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Quenching of Star Formation
In the last decade we have seen an enormous increase in the size and quality of spectroscopic galaxy surveys, both at low and high redshift. New statistical techniques to analyse large portions of…
Vivienne Wild, Tamas Budavari, Jeremy Blaizot et al.Nov 7, 2008
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Near Infrared Spectroscopic Monitoring of EXor variables: First Results
We present low resolution (R approximately 250) spectroscopy in the near-IR (0.8 to 2.5um) of the EXor variables. These are the initial results (obtained during the period 2007-2008) from a long term…
D. Lorenzetti, V. M. Larionov, T. Giannini et al.Nov 7, 2008
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Improved equations for eccentricity generation in hierarchical triple systems
In a series of papers, we developed a technique for estimating the inner eccentricity in hierarchical triple systems, with the inner orbit being initially circular. However, for certain combinations…
Nikolaos GeorgakarakosNov 7, 2008
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Non-LTE modeling of the near UV band of late-type stars
We investigate the ability of both LTE and Non-LTE models to fit the near UV band absolute flux distribution and individual spectral line profiles of three standard stars for which high quality…
C. Ian Short, P. H. HauschildtNov 7, 2008
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Particle trajectories and acceleration during 3D fan reconnection
Context. The primary energy release in solar flares is almost certainly due to magnetic reconnection, making this a strong candidate as a mechanism for particle acceleration. While particle…
S. Dalla, P. K. BrowningNov 7, 2008
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Input from opacity data in computation of pulsation instability
Several types of variable stars are found along the HR diagram whose pulsations are driven by the κ-mechanism. Given their nature, the precise (T eff-L) domain where these pulsators are…
Josefina Montalbán, Andrea MiglioNov 7, 2008
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Eruption of magnetic flux ropes during flux emergence
Aims: We investigate the formation of flux ropes in a flux emergence region and their rise into the outer atmosphere of the Sun. Methods: We perform 3D numerical experiments solving the…
V. Archontis, T. TorokNov 7, 2008
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Renewed activity from the X-ray transient SAXJ 1810.8-2609 with INTEGRAL
We report on the results of INTEGRAL observations of the neutron star low mass X-ray binary SAX J1810.8-2609 during its latest active phase in August 2007. The current outburst is the first one since…
M. Fiocchi, L. Natalucci, J. Chenevez et al.Nov 7, 2008
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CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
We present CAIXA, a Catalogue of AGN In the XMM-Newton Archive. It consists of all the radio-quiet X-ray unobscured (NH<2×1022 cm-2) Active Galactic Nuclei (AGN) observed by…
Stefano Bianchi, Matteo Guainazzi, Giorgio Matt et al.Nov 7, 2008
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3D acoustic imaging applied to the Baikal Neutrino Telescope
A hydro-acoustic imaging system was tested in a pilot study on distant localization of elements of the Baikal underwater neutrino telescope. For this innovative approach, based on broad band acoustic…
K. G. Kebkal, R. Bannasch, O. G. Kebkal et al.Nov 7, 2008
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Lopsided Spiral Galaxies
The light distribution in the disks of many galaxies is non-axisymmetric or `lopsided' with a spatial extent much larger along one half of a galaxy than the other, as in M101. Recent near-IR…
Chanda J. Jog, Francoise CombesNov 7, 2008
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Rotational spectrum of deuterated and 15N ethyl cyanides: CH3CHDCN and CH2DCH2CN and of CH3CH2C15N
Ethyl cyanide is an abundant molecule in hot molecular clouds. Lines from 13C isotopically substituted ethyl cyanide were identified in Orion. To enable the search and the possible detection of other…
Laurent Margulès, Roman Motiyenko, Karine Demyk et al.Nov 7, 2008
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The seismology programme of CoRoT
We introduce the main lines and specificities of the CoRoT Seismology Core Programme. The development and consolidation of this programme has been made in the framework of the CoRoT Seismology…
E. Michel, A. Baglin, M. Auvergne et al.Nov 7, 2008
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Magnetic Structure of Umbral Dots Observed with Hinode Solar Optical Telescope
High resolution and seeing-free spectroscopic observation of a decaying sunspot was done with the Solar Optical Telescope aboard Hinode satellite. The target was NOAA 10944 located in the west side…
Hiroko Watanabe, Reizaburo Kitai, Kiyoshi Ichimoto et al.Nov 7, 2008
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