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Astrophysics papers — page 68

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10 μm interferometry of disks around young stars
This contribution reviews results from interferometric observations of circumstellar disks around young stars of 3 M, performed with the MIDI instrument operating in the 10 μm…
Roy van BoekelOct 30, 2008
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Bulge-Disk Decompositions and Structural Bimodality of Ursa Major Cluster Spiral Galaxies
We present bulge and disk (B/D) decompositions of existing K'-band surface brightness profiles for 65 Ursa Major cluster spiral galaxies. This improves upon the disk-only fits of Tully et al.…
Michael McDonald, Stephane Courteau, R. Brent TullyOct 30, 2008
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ULTRACAM observations of two accreting white dwarf pulsators
In this paper we present high time-resolution observations of GW Librae and SDSS J161033.64-010223.3 -- two cataclysmic variables which have shown periodic variations attributed to non-radial…
C. M. Copperwheat, T. R. Marsh, V. S. Dhillon et al.Oct 30, 2008
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The Standard Candle Method for Type II-Plateau Supernovae
In this thesis we study the "standardized candle method" using a sample of 37 nearby (redshift < 0.06) Type II-plateau supernovae with BVRI photometry and optical spectroscopy. An analytic…
Felipe OlivaresOct 30, 2008
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New Constraints on Hidden Photons using Very High Energy Gamma-Rays from the Crab Nebula
Extensions of the standard model of particle physics, in particular those based on string theory, often predict a new U(1) gauge symmetry in a hidden sector. The corresponding gauge boson, called…
Hannes-Sebastian Zechlin, Dieter Horns, Javier RedondoOct 30, 2008
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Dust-enshrouded star formation in XMM-LSS galaxy clusters
We present an investigation of the dust-enshrouded activity in a sample of X-ray selected clusters drawn from the XMM-LSS survey in the redshift range z ~ 0.05 - 1.05. By taking advantage of the…
S. Temporin, P. -A. Duc, O. Ilbert et al.Oct 30, 2008
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Exact potential-density pairs for flattened dark haloes
Cosmological simulations suggest that dark matter haloes are not spherical, but typically moderately to strongly triaxial systems. We investigate methods to convert spherical potential-density pairs…
Maarten BaesOct 30, 2008
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Modelling the outburst profile of X-ray powered millisecond pulsars
The outbursts of low mass X-ray binaries are prolonged relative to those of dwarf nova cataclysmic variables as a consequence of X-ray irradiation of the disc. We show that the time-scale of the…
Maurizio FalangaOct 30, 2008
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Non-linear non-local Cosmology
Non-local equations of motion contain an infinite number of derivatives and commonly appear in a number of string theory models. We review how these equations can be rewritten in the form of a…
N. J. Nunes, D. J. MulryneOct 30, 2008
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INTEGRAL and XMM-Newton Spectroscopy of GX 339-4 During Hard/Soft Intermediate and High/Soft States in the 2007 Outburst
We present simultaneous XMM-Newton and INTEGRAL observations of the luminous black hole transient and relativistic jet source GX 339-4. GX 339-4 started an outburst on November of 2006 and our…
M. D. Caballero-Garcia, J. M. Miller, M. Diaz Trigo et al.Oct 30, 2008
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Supergiant Fast X-ray Transients: interpretation of archival INTEGRAL data
INTEGRAL monitoring of the Galactic Plane in the last 5 years revealed a new subclass of High Mass X-ray Binaries (HMXBs), the Supergiant Fast X-ray Transients (SFXTs). They display flares lasting…
L. Ducci, L. Sidoli, A. Paizis et al.Oct 30, 2008
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On the relationship between instability and Lyapunov times for the 3-body problem
In this study we consider the relationship between the survival time and the Lyapunov time for 3-body systems. It is shown that the Sitnikov problem exhibits a two-part power law relationship as…
D. J. Urminsky, D. C. HeggieOct 30, 2008
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A radio and near-infrared mini-survey of the MGRO J2019+37 complex
MGRO J2019+37 is an unidentified source of very high energy gamma-rays originally reported by the MILAGRO collaboration as the brightest TeV source in the Cygnus region. Despite the poor angular…
J. M. Paredes, J. Marti, C. H. Ishwara-Chandra et al.Oct 30, 2008
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INTEGRAL observes the 2007 outburst of the Be transient SAX J2103.5+4545
We performed a detailed study of the 2007 outburst of the 352s pulsar SAXJ2103.5+4545, a Be/X-ray transient observed by INTEGRAL, to study its spectral and temporal properties during the evolution of…
L. Ducci, L. Sidoli, A. Paizis et al.Oct 30, 2008
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High resolution in z-direction: The simulation of disc-bulge-halo galaxies using the particle-mesh code SUPERBOX
SUPERBOX is known as a very efficient particle-mesh code with highly-resolving sub-grids. Nevertheless, the height of a typical galactic disc is small compared to the size of the whole system.…
R. Bien, A. Just, P. Berczik et al.Oct 30, 2008
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Swift monitoring of Supergiant Fast X-ray Transients: the out-of-outburst behaviour and the flares from IGRJ17544-2916 and XTEJ1739-302
Supergiant Fast X-ray Transients (SFXTs) are a sub-class of High Mass X-ray Binaries (HMXBs) associated with OB supergiant companions and displaying transient X-ray activity. This behaviour is quite…
L. Sidoli, P. Romano, G. Cusumano et al.Oct 30, 2008
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Learning about Galactic structure with Gaia astrometry
The Gaia mission is reviewed together with the expected contents of the final catalogue. It is then argued that the ultimate goal of Galactic structure studies with Gaia astrometry should be to build…
Anthony G. A. BrownOct 30, 2008
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On Gravitational Waves in Spacetimes with a Nonvanishing Cosmological Constant
We study the effect of a cosmological constant Λ on the propagation and detection of gravitational waves. To this purpose we investigate the linearised Einstein's equations with terms up to…
J. Näf, P. Jetzer, M. SerenoOct 30, 2008
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Sub-mm/mm studies of the molecular gas in the Galactic disk; the TeV gamma ray SNR RXJ1713.7-3946 and the W28 high mass star forming region
Interstellar molecular clouds are gamma ray sources through the interactions with cosmic ray protons followed by production of neutral pions which decay into gamma rays. We present new NANTEN2…
Yasuo FukuiOct 30, 2008
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Star Formation in Disks: Spiral Arms, Turbulence, and Triggering Mechanisms
Star formation is enhanced in spiral arms because of a combination of orbit crowding, cloud collisions, and gravitational instabilities. The characteristic mass for the instability is 107 Msun in…
Bruce G. ElmegreenOct 30, 2008
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Bulge and Clump Evolution in Hubble Ultra Deep Field Clump Clusters, Chains and Spiral Galaxies
Clump clusters and chain galaxies in the Hubble Ultra Deep Field are examined for bulges in the NICMOS images. Approximately 50% of the clump clusters and 30% of the chains have relatively red and…
Bruce G. Elmegreen, Debra Meloy Elmegreen, Maria Ximena Fernandez et al.Oct 30, 2008
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Multiwavelength study of the bright X-ray source population in the interacting galaxies NGC5774/NGC5775
A few nearby interacting galaxies are known that host elevated number of ultraluminous X-ray sources. Here we report the results of a multiwavelength study of the X-ray source population in the field…
Kajal K. Ghosh, Douglas A. Swartz, Allyn F. Tennant et al.Oct 30, 2008
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Weakly Turbulent MHD Waves in Compressible Low-Beta Plasmas
In this Letter, weak turbulence theory is used to investigate interactions among Alfven waves and fast and slow magnetosonic waves in collisionless low-beta plasmas. The wave kinetic equations are…
Benjamin D. G. ChandranOct 30, 2008
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Extended Slow-Roll Conditions and Primordial Fluctuations: Multiple Scalar Fields and Generalized Gravity
As an extension of our previous study, we derive slow-roll conditions for multiple scalar fields which are non-minimally coupled with gravity and for generalized gravity theories of the form…
Takeshi Chiba, Masahide YamaguchiOct 29, 2008
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Direct Calculation of the Turbulent Dissipation Efficiency in Anelastic Convection
The current understanding of the turbulent dissipation in stellar convective zones is based on the assumption that the turbulence follows Kolmogorov scaling. This assumption is valid for some cases…
Kaloyan Penev, Joseph Barranco, Dimitar SasselovOct 29, 2008
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