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Astrophysics papers — page 147

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The Influence of Concentration and Dynamical State on Scatter in the Galaxy Cluster Mass-Temperature Relation
Using a hydrodynamics plus N-body simulation of galaxy cluster formation within a large volume and mock Chandra X-ray observations, we study the form and evolution of the intrinsic scatter about the…
H. -Y. Yang, P. M. Ricker, P. M. SutterAug 29, 2008
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Equation-of-State Dependent Features in Shock-Oscillation Modulated Neutrino and Gravitational-Wave Signals from Supernovae
We present 2D hydrodynamic simulations of the long-time accretion phase of a 15 solar mass star after core bounce and before the launch of a supernova explosion. Our simulations are performed with…
A. Marek, H. -Th. Janka, E. MuellerAug 29, 2008
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Prediction for the He I 10830A Absorption Wing in the Coming Event of Eta Carinae
We propose an explanation to the puzzling appearance of a wide blue absorption wing in the He I 10830A P-Cygni profile of the massive binary star Eta Carinae several months before periastron passage.…
Amit Kashi, Noam SokerAug 29, 2008
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Signature of Primordial Non-Gaussianity on Matter Power Spectrum
Employing the perturbative treatment of gravitational clustering, we discuss possible effects of primordial non-Gaussianity on the matter power spectrum. As gravitational clustering develops, the…
Atsushi Taruya, Kazuya Koyama, Takahiko MatsubaraAug 29, 2008
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Maximum stellar mass versus cluster membership number revisited
We have made a new compilation of observations of maximum stellar mass versus cluster membership number from the literature, which we analyse for consistency with the predictions of a simple random…
Th. Maschberger, C. J. ClarkeAug 29, 2008
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Reprocessing of X-rays in the outer accretion disc of the black hole binary XTE J1817--330
We build a simple model of the optical/UV emission from irradiation of the outer disc by the inner disc and coronal emission in black hole binaries. We apply this to the broadband Swift data from the…
Marek Gierlinski, Chris Done, Kim PageAug 29, 2008
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On the structure of the Sun and alpha Centauri A and B in the light of seismic and non-seismic constraints
The small separation (delta nu 01, delta nu 02 and delta nu 13) between the oscillations with low degree l is dependent primarily on the sound speed profile within the stellar core, where nuclear…
M. YildizAug 29, 2008
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Propagation Effects in Magnetized Transrelativistic Plasmas
The transfer of polarized radiation in magnetized and non-magnetized relativistic plasmas is an area of research with numerous flaws and gaps. The present paper is aimed at filling some gaps and…
Roman ShcherbakovAug 29, 2008
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Periodic Radio and H-alpha Emission from the L Dwarf Binary 2MASSW J0746425+200032: Exploring the Magnetic Field Topology and Radius of an L Dwarf
[Abridged] We present an 8.5-hour simultaneous radio, X-ray, UV, and optical observation of the L dwarf binary 2MASSW J0746+20. We detect strong radio emission, dominated by short-duration periodic…
E. Berger, R. E. Rutledge, N. Phan-Bao et al.Aug 29, 2008
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Constraining the AGN Contribution in a Multiwavelength Study of Seyfert Galaxies
We have studied the relationship between the high- and low-ionization [O IV] lambda 25.89 micron, [Ne III] lambda 15.56 micron and [Ne II] lambda 12.81 micron emission lines with the aim of…
M. Meléndez, S. B. Kraemer, H. R. Schmitt et al.Aug 29, 2008
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PAHs in Comets: An Overview
Polycyclic aromatic hydrocarbon (PAH) molecules, ubiquitously seen in the interstellar medium (ISM) of our own and external galaxies, might have been incorporated into comets if they are formed from…
Aigen LiAug 29, 2008
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Latest supernovae constraints on f(R) cosmologies
A class of modified gravity, known as f(R)-gravity, has presently been applied to Cosmology as a realistic alternative to dark energy. In this paper we use the most recent Type-Ia Supernova (SNe…
J. Santos, J. S. Alcaniz, F. C. Carvalho et al.Aug 29, 2008
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General Relativistic Hydrodynamic Simulations and Linear Analysis of the Standing Accretion Shock Instability around a Black Hole
We study the stability of standing shock waves in advection-dominated accretion flows into a Schwarzschild black hole by 2D general relativistic hydrodynamic simulations as well as linear analysis in…
Hiroki Nagakura, Shoichi YamadaAug 29, 2008
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Tentative Detection of the Rotation of Eris
We report a multi-week sequence of B-band photometric measurements of the dwarf planet Eris using the Swift satellite. The use of an observatory in low-Earth orbit provides better temporal…
H. G. Roe, R. E. Pike, M. E. BrownAug 29, 2008
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On the Crystallinity of Silicate Dust in the Interstellar Medium
An accurate knowledge of the mineralogy (chemical composition and crystal structure) of the silicate dust in the interstellar medium (ISM) is crucial for understanding its origin in evolved stars,…
M. P. Li, G. Zhao, Aigen LiAug 29, 2008
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On Buckyonions as an Interstellar Grain Component
The carrier of the 2175 Angstrom interstellar extinction feature remains unidentified since its first detection over 40 years ago. In recent years carbon buckyonions have been proposed as a carrier…
Aigen Li, J. H. Chen, M. P. Li et al.Aug 29, 2008
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Optical Properties of Dust
Except in a few cases cosmic dust can be studied in situ or in terrestrial laboratories, essentially all of our information concerning the nature of cosmic dust depends upon its interaction with…
Aigen LiAug 29, 2008
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On the Anomalous Silicate Emission Features of AGNs: A Possible Interpretation Based on Porous Dust
The recent Spitzer detections of the 9.7 micron Si--O silicate emission in type 1 AGNs provide support for the AGN unification scheme. The properties of the silicate dust are of key importance to…
M. P. Li, Q. J. Shi, Aigen LiAug 29, 2008
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Dust in Active Galactic Nuclei
Dust plays an essential role in the unification theory of active galactic nuclei (AGNs). This review summarizes our current understanding of the extinction and infrared emission properties of the…
Aigen LiAug 29, 2008
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On Dust Extinction of Gamma-ray Burst Host Galaxies
Although it is well recognized that gamma-ray burst (GRB) afterglows are obscured and reddened by dust in their host galaxies, the wavelength-dependence and quantity of dust extinction are still…
Aigen Li, S. L. Liang, D. A. Kann et al.Aug 29, 2008
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Complex Organic Materials in the HR 4796A Disk?
The red spectral shape of the visible to near infrared reflectance spectrum of the sharply-edged ring-like disk around the young main sequence star HR 4796A was recently interpreted as the presence…
M. Koehler, I. Mann, Aigen LiAug 29, 2008
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Reference grids of stellar models and oscillation frequencies: Data from the CESAM stellar evolution code and ADIPLS oscillation programme
We present grids of stellar models and their associated oscillation frequencies that have been used by the CoRoT Seismology Working Group during the scientific preparation of the CoRoT mission. The…
Yveline Lebreton, Eric MichelAug 29, 2008
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Are ring galaxies the ancestors of giant low surface brightness galaxies?
Giant low surface brightness galaxies (GLSBs) have flat discs extending up to ~100 kpc. Their formation is a puzzle for cosmological simulations in the cold dark matter scenario. We suggest that…
M. Mapelli, B. Moore, E. Ripamonti et al.Aug 29, 2008
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Emission line activity in type 2 quasars from the Sloan Digital Sky Survey
We have compared the optical emission line ratios of type 2 quasars from Zakamska et al. with standard AGN photoionization model predictions, Seyfert 2s, HII galaxies, and narrow line FRII radio…
Montse Villar-Martin, Andrew Humphrey, Alejo Martinez-Sansigre et al.Aug 29, 2008
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Origin of multiple stellar populations in globular clusters and their helium enrichment
The various scenarios proposed for the origin of the multiple, helium-enriched populations in massive globular clusters are critically compared to the relevant constraining observations. Among…
Alvio RenziniAug 29, 2008
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