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Confronting 2D delayed-detonation models with light curves and spectra of Type Ia supernovae
supernovae general
2011/8/24
We compare models for Type Ia supernova (SN Ia) light curves and spectra with an extensive set of observations. The models come from a recent survey of 44 two-dimensional delayed-detonation models com...
Subaru weak-lensing study of A2163: bimodal mass structure
Subaru weak-lensing study A2163 bimodal mass structure
2011/8/24
We present a weak-lensing analysis of the merging cluster A2163 using Subaru/Suprime-Cam and CHFT/Mega-Cam data and discuss the dynamics of this cluster merger, based on complementary weak-lensing, X-...
Nonlinear Dynamical Friction of a Circular-Orbit Perturber in a Gaseous Medium
Galaxy Astrophysics (astro-ph.GA)
2010/12/28
We use three-dimensional hydrodynamic simulations to investigate the nonlinear gravitational responses of gas to, and the resulting drag forces on, very massive perturbers moving on circular orbits.
The Compton shoulder of the Fe Kalpha fluorescent emission line in active galactic nuclei
The Compton shoulder the Fe Kalpha fluorescent emission line
2011/1/11
We present new, high signal-to-noise ratio results from a Monte Carlo study of the properties of the Compton shoulder of the Fe Kalpha emission line in the toroidal X-ray reprocessor model of Murphy &...
The Voronoi Tessellation cluster finder in 2+1 dimensions
Cosmology observations – Galaxies: clusters general – Methods data analysis
2010/11/16
We present a detailed description of the Voronoi Tessellation (VT) cluster finder algorithm in 2+1 dimensions, which improves on past implementations of this technique. The need for cluster finder alg...
Extrapolating the Evolution of Galaxy Sizes to the Epoch of Reionization
galaxies evolution formation high-redshift cosmology theory
2010/11/16
We use data on the high-redshift evolution of the size distribution and luminosity function of galaxies to constrain the relationship between their star formation eciency and starburst lifetime. Base...
The orientation of the nuclear obscurer of the AGNs
galaxies statistics — galaxies Seyfert — galaxies nuclei — galaxies spiral
2010/11/15
We examine the distribution of axis ratios of a large sample of disk galaxies hosting type 2 AGNs selected from the Sloan Digital Sky Survey and compare it with a well-defined control sample of non-ac...
The central slope of dark matter cores in dwarf galaxies: Simulations vs. THINGS
Galaxies dark matter halos – galaxies cosmological N-body+SPH simulations –galaxies kinematics and dynamics
2010/11/15
We make a direct comparison of the derived dark matter (DM) distributions between hydrody-
namical simulations of dwarf galaxies assuming a CDM cosmology and the observed dwarf galaxies sample from ...
Accretion-regulated star formation in late-type galaxies
Accretion-regulated star late-type galaxies
2010/11/15
We develop a four-phase galaxy evolution model in order to study the effect of accretion of extra-galactic gas on the star formation rate (SFR) of a galaxy. Pure self-regulated star formation of isola...
The Birth of a Galaxy: Primordial Metal Enrichment and Population II Stellar Populations
cosmology methods numerical hydrodynamics radiative transfer star formation
2010/11/15
Population III stars first form in dark matter halos with masses around 106M⊙. By definition,
they are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas-p...
Particle Production of Vector Fields: Scale Invariance is Attractive
Particle Production of Vector Fields Scale Invariance
2010/11/16
In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared
it is demonstrated that, under fairly general conditions, a scale-invariant spectrum of perturbations f...
HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
seismic spectropolarimetric analysis Saturn-like planet
2010/11/15
Context. HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run acquired in ...
PTF10nvg: An Outbursting Class I Protostar in the Pelican/North American Nebula
stars formation – stars pre-main sequence
2010/11/15
During a synoptic survey of the North American Nebula region, the Palomar Transient Factory
(PTF) detected an optical outburst (dubbed PTF10nvg) associated with the previously unstudied
flat or risi...
Anisotropic AGN Outflows and Enrichment of the Intergalactic Medium. II. Metallicity
cosmology — galaxies active — galaxies jets — intergalactic medium — methods
2010/11/15
We investigate the large-scale influence of outflows from AGNs in enriching the IGM with metals in a cosmological context. We combine cosmological simulations of large-scale structure formation with a...
Unification of Luminous Type 1 Quasars through CIV Emission
quasars general quasars emission lines quasars absorption lines line profiles radio continuum galaxies
2010/11/12
Using a sample of 30,000 quasars from the 7th Data Release of the Sloan Dig-ital Sky Survey, we explore the range of properties exhibited by high-ionization,broad emission lines, such as C IV 1549. ...