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Astrophysics papers — page 64

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Detecting Mass Substructure in Galaxy Clusters: An Aperture Mass Statistic for Gravitational Flexion
Gravitational flexion has recently been introduced as a technique by which one can map out and study substructure in clusters of galaxies. Previous analyses involving flexion have measured the…
Adrienne Leonard, Lindsay J. King, Stephen M. WilkinsNov 3, 2008
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Atmospheric Escape from Hot Jupiters
Photoionization heating from UV radiation incident on the atmospheres of hot Jupiters may drive planetary mass loss. We construct a model of escape that includes realistic heating and cooling,…
Ruth Murray-Clay, Eugene Chiang, Norman MurrayNov 3, 2008
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Halo Density Profiles Consistent with Asymmetric M-B Velocity Distributions-Implications on Direct Dark Matter Searches
In the present paper we obtain the WIMP velocity distribution in our vicinity starting from spherically symmetric WIMP density profiles in a self consistent way by employing the Eddington approach.…
J. D. VergadosNov 3, 2008
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Science with the World Space Observatory - Ultraviolet
The World Space Observatory-Ultraviolet (WSO-UV) will provide access to the UV range during the next decade. The instrumentation on board will allow to carry out high resolution imaging, high…
Ana I. Gomez de Castro, Isabella Pagano, Mikhail Sachkov et al.Nov 3, 2008
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DAMA/LIBRA findings urge replacement of the WIMP hypotheses by the daemon paradigm as a basis for experimental studies of DM objects
The simplest version of the daemon paradigm suggests the modulated 2-6-keV range events in DAMA/NaI and DAMA/LIBRA detectors are caused by the iodine ions knocked out elastically by the electrically…
E. M. DrobyshevskiNov 3, 2008
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Hard X-Ray sources observed by INTEGRAL/IBIS and their science
After more than 5.5 years of in flight lifetime, the ESA space observatory INTEGRAL is depicting a new scenario in the soft gamma Ray domain. With the observation and discovery of more than 400 hard…
Pietro UbertiniNov 3, 2008
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The environments of starburst and post-starburst galaxies at z=0.4-0.8
Post-starburst (E+A or k+a) spectra, characterized by their exceptionally strong Balmer lines in absorption and the lack of emission lines, belong to galaxies in which the star formation activity…
Bianca M. Poggianti, Alfonso Aragon-Salamanca, Dennis Zaritsky et al.Nov 3, 2008
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The full contribution of a stochastic background of magnetic fields to CMB anisotropies
We study the contribution of a stochastic background (SB) of primordial magnetic fields (PMF) on the anisotropies in temperature and polarization of the cosmic microwave background radiation (CMB). A…
Daniela Paoletti, Fabio Finelli, Francesco PaciNov 3, 2008
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Star Formation in Disk Galaxies. I. Formation and Evolution of Giant Molecular Clouds via Gravitational Instability and Cloud Collisions
We investigate the formation and evolution of giant molecular clouds (GMCs) in a Milky-Way-like disk galaxy with a flat rotation curve. We perform a series of 3D adaptive mesh refinement (AMR)…
Elizabeth J. Tasker, Jonathan C. TanNov 3, 2008
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Subhaloes in Scale-Free Cosmologies
We explore the dependence of the subhalo mass function on the spectral index n of the linear matter power spectrum using scale-free Einstein-de Sitter simulations with n=-1 and n=-2.5. We carefully…
P. J. Elahi, R. J. Thacker, L. M. Widrow et al.Nov 3, 2008
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Searching for substellar companions of young isolated neutron stars
Context: Only two planetary systems around old ms-pulsars are currently known. Young radio pulsars and radio-quiet neutron stars cannot be covered by the usually-applied radio pulse timing technique.…
B. Posselt, R. Neuhäuser, F. HaberlNov 3, 2008
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Color Bimodality in M87 Globular Clusters
We present an analysis of a 50 orbit HST ACS observation of the M87 globular cluster system. We use the extraordinary depth of this dataset to test whether the colors and magnitudes show evidence for…
Christopher Z. Waters, Stephen E. Zepf, Tod R. Lauer et al.Nov 3, 2008
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Analytical Blowup Solutions to the 3-dimensional Pressureless Navier-Stokes-Poisson Equations with Density-dependent Viscosity
We study the pressureless Navier--Stokes-Poisson equations of describing the evolution of the gaseous star in astrophysics. The isothermal blowup solutions of Yuen, to the Euler-Poisson equations in…
Manwai YuenNov 3, 2008
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Implications of cosmic ray results for UHE neutrinos
Recent measurements of the spectrum and composition of ultrahigh energy cosmic rays suggest that their extragalactic sources may be accelerating heavy nuclei in addition to protons. This can suppress…
Subir SarkarNov 3, 2008
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Gaseous drag on a gravitational perturber in Modified Newtonian Dynamics and the structure of the wake
We calculate the structure of a wake generated by, and the dynamical friction force on, a gravitational perturber travelling through a gaseous medium of uniform density and constant background…
F. J. Sanchez-SalcedoNov 3, 2008
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Observations of V592 Cassiopeiae with the Spitzer Space Telescope - Dust in the Mid-Infrared
We present the ultraviolet-optical-infrared spectral energy distribution of the low inclination novalike cataclysmic variable V592 Cassiopeiae, including new mid-infrared observations from 3.5-24…
D. W. Hoard, Stella Kafka, Stefanie Wachter et al.Nov 3, 2008
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Doppler maps and surface differential rotation of EI Eri from the MUSICOS 1998 observations
We present time-series Doppler images of the rapidly-rotating active binary star EI Eri from spectroscopic observations collected during the MUSICOS multi-site campaign in 1998, since the critical…
Zs. Kővári, A. Washuettl, B. H. Foing et al.Nov 3, 2008
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The Environmental Influence on the Evolution of Local Galaxies
The results of an Halpha photometric survey of 30 dwarf galaxies of various morphologies in the Centaurus A and Sculptor groups are presented. Of these 30, emission was detected in 13: eight are of…
A. Bouchard, G. S. Da Costa, H. JerjenNov 3, 2008
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On the evolution of the Gamma- and X-ray luminosities of Pulsar Wind Nebulae
Pulsar wind nebulae are a prominent class of very high energy (E > 0.1 TeV) Galactic sources. Their Gamma-ray spectra are interpreted as due to inverse Compton scattering of ultrarelativistic…
Fabio Mattana, Maurizio Falanga, Diego Götz et al.Nov 3, 2008
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Two-component galaxy models: the effect of density profile at large radii on the phase-space consistency
It is well known that the density and anisotropy profile in the inner regions of a stellar system with positive phase-space distribution function are not fully independent. Here we study the…
Luca Ciotti, Lucia MorgantiNov 3, 2008
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CRASH2: colored packets and other updates
In this paper we report on the improvements implemented in the cosmological radiative transfer code CRASH. In particular we present a new multi-frequency algorithm for spectra sampling which makes…
A. Maselli, B. Ciardi, A. Kanekar et al.Nov 3, 2008
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Accurate estimators of power spectra in N-body simulations
abridged] A method to rapidly estimate the Fourier power spectrum of a point distribution is presented. This method relies on a Taylor expansion of the trigonometric functions. It yields the Fourier…
Stephane Colombi, Andrew H. Jaffe, Dmitri Novikov et al.Nov 3, 2008
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Parameter Estimation from an Optimal Projection in a Local Environment
The parameter fit from a model grid is limited by our capability to reduce the number of models, taking into account the number of parameters and the non linear variation of the models with the…
A. Bijaoui, A. Recio-Blanco, P. de LavernyNov 3, 2008
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WFCAM Survey of M31 Globular Clusters: Low Mass X-ray Binaries
We investigate the relationship between Low Mass X-ray Binaries (LMXBs) and globular clusters (GCs) using UKIRT observations of M31 and existing Chandra, XMM-Newton, and ROSAT catalogues. By fitting…
Mark B. Peacock, Thomas J. Maccarone, Christopher Z. Waters et al.Nov 3, 2008
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Mass and Mean Velocity Dispersion Relations for Supermassive Black Holes in Galactic Bulges
Growing evidence indicate supermassive black holes (SMBHs) in the mass range of M BH 106-1010M lurking in central bulges of many galaxies. Extensive observations reveal…
Yu-Qing Lou, Yan-Fei JiangNov 3, 2008
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