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19922026
Showing 2005Show all

223 papers · 1 filter

astro-ph2005★ 18 cited

The effect of heat conduction on the interaction of disk and corona around black holes

E. Meyer-Hofmeister, F. Meyer

Heat conduction plays an important role in the balance between heating and cooling in many astrophysical objects, e.g. cooling flows in clusters of galaxies. Here we investigate th…

astro-ph2005★ 74 cited

Hot and Cooled baryons in SPH simulations of galaxy clusters: physics and numerics

S. Borgani, K. Dolag, G. Murante +7

We discuss an extended set of Tree+SPH simulations of galaxy clusters, with the goal of investigating the interplay between numerical resolution effects and star-formation/feedback…

astro-ph2005★ 40 cited

Neutron-loaded outflows in gamma-ray bursts

Elena M. Rossi, Andrei M. Beloborodov, Martin J. Rees

Relativistic neutron-loaded outflows in gamma-ray bursts are studied at their early stages, before deceleration by a surrounding medium. The outflow has four components: radiation,…

astro-ph2005★ 330 cited

The Fundamental Scaling Relations of Elliptical Galaxies

B. Robertson, T. J. Cox, L. Hernquist +4

(ABRIDGED) We examine the fundamental scaling relations of elliptical galaxies formed through mergers. Using hundreds of simulations to judge the impact of progenitor galaxy proper…

astro-ph2005★ 74 cited

On the Viability of Bianchi Type VIIh Models with Dark Energy

T. R. Jaffe, S. Hervik, A. J. Banday +1

We generalize the predictions for the CMB anisotropy patterns arising in Bianchi type VIIh universes to include a dark energy component. We consider these models in light of the re…

astro-ph2005★ 308 cited

The evolution of the star formation activity in galaxies and its dependence on environment

B. M. Poggianti, A. von der Linden, G. De Lucia +16

We study how the proportion of star-forming galaxies evolves between z=0.8 and z=0 as a function of galaxy environment, using the [OII] line in emission as a signature of ongoing s…

astro-ph2005★ 8 cited

Lyman-alpha forest-CMB cross-correlation and the search for the ionized baryons at high redshift

Rupert A. C. Croft, A. J. Banday, Lars Hernquist

The intergalactic neutral hydrogen which is responsible for the Lyman alpha forest of quasar absorption is a tracer of much larger amounts of ionised hydrogen. The ionised componen…

astro-ph2005★ 20 cited

Boundary layer emission in luminous LMXBs

M. Gilfanov, M. Revnivtsev

We show that aperiodic and quasiperiodic variability of bright LMXBs - atoll and Z- sources, on ~sec - msec time scales is caused primarily by variations of the boundary layer lumi…

astro-ph2005★ 19 cited

The ignition of thermonuclear flames in Type Ia supernovae

L. Iapichino, M. Brüggen, W. Hillebrandt +1

In the framework of the Chandrasekhar-mass deflagration model for Type Ia supernovae (SNe Ia), a persisting free parameter is the initial morphology of the flame front, which is li…

astro-ph2005★ 154 cited

Acoustic oscillations in the SDSS DR4 Luminous Red Galaxy sample power spectrum

Gert Huetsi

We calculate the redshift-space power spectrum of the Sloan Digital Sky Survey (SDSS) Data Release 4 (DR4) Luminous Red Galaxy (LRG) sample, finding evidence for a full series of a…

astro-ph2005★ 91 cited

The stability of toroidal fields in stars

Jonathan Braithwaite

We present numerical models of hydromagnetic instabilities under the conditions prevailing in a stably stratified, non-convective stellar interior, and compare them with previous r…

astro-ph2005★ 27 cited

The soft X-ray properties of quasars in the Sloan Digital Sky Survey

Shiyin Shen, Simon D. M. White, H. J. Mo +4

We use the ROSAT All Sky Survey (RASS) to study the soft X-ray properties of a homogeneous sample of 46,420 quasars selected from the third data release of the Sloan Digital Sky Su…

astro-ph2005★ 197 cited

Detection with RHESSI of high frequency X-ray oscillations in the tail of the 2004 hyperflare from SGR 1806-20

Anna L Watts, Tod E Strohmayer

The recent discovery of high frequency oscillations in giant flares from SGR 1806-20 and SGR 1900+14 may be the first direct detection of vibrations in a neutron star crust. If thi…

astro-ph2005★ 205 cited

The influence of baryons on the clustering of matter and weak lensing surveys

Y. P. Jing, Pengjie Zhang, W. P. Lin +2

Future weak lensing measurements of cosmic shear will reach such high accuracy that second order effects in weak lensing modeling, like the influence of baryons on structure format…

astro-ph2005★ 138 cited

Evolution in the black hole mass-bulge mass relation: a theoretical perspective

Darren J Croton

We explore the growth of super-massive black holes and host galaxy bulges in the galaxy population using the Millennium Run LCDM simulation coupled with a model of galaxy formation…

astro-ph2005★ 293 cited

Two-Dimensional Hydrodynamic Core-Collapse Supernova Simulations with Spectral Neutrino Transport II. Models for Different Progenitor Stars

R. Buras, H. -Th. Janka, M. Rampp +1

1D and 2D supernova simulations for stars between 11 and 25 solar masses are presented, making use of the Prometheus/Vertex neutrino-hydrodynamics code, which employs a full spectr…

astro-ph2005★ 95 cited

Selecting damped Lyman-alpha systems through CaII absorption. I: Dust depletions and reddening at z~1

Vivienne Wild, Paul Hewett, Max Pettini

We use the average E(B-V) and ZnII column densities of a sample of z~1 CaII (3935, 3970) absorption line systems selected from the Sloan Digital Sky Survey (SDSS DR4) to show that…

gr-qc2005★ 13 cited

Cauchy-perturbative matching revisited: tests in spherical symmetry

Burkhard Zink, Enrique Pazos, Peter Diener +1

During the last few years progress has been made on several fronts making it possible to revisit Cauchy-perturbative matching (CPM) in numerical relativity in a more robust and acc…

astro-ph2005★ 68 cited

Weighing the young stellar discs around Sgr A*

Sergei Nayakshin, Walter Dehnen, Jorge Cuadra +1

It is believed that young massive stars orbiting Sgr A* in two stellar discs on scales of 0.1-0.2 parsecs were formed either farther out in the Galaxy and then quickly migrated inw…

astro-ph2005★ 18 cited

How do galactic winds affect the Lyalpha forest?

Serena Bertone, Simon D. M. White

We investigate the effect of galactic winds on the Lyalpha forest in cosmological simulations of structure and galaxy formation. We combine high resolution N-body simulations of th…

astro-ph2005★ 49 cited

On the Lengths, Colors and Ages of 18 Face-On Bars

Dimitri A. Gadotti, Ronaldo E. de Souza

Along with a brief analysis we present data obtained from BVRI and Ks images of a sample of 19 galaxies (18 barred and 1 unbarred) which will be further explored in a future paper.…

astro-ph2005★ 86 cited

Weak lensing mass reconstructions of the ESO Distant Cluster Survey

D. Clowe, P. Schneider, A. Aragon-Salamanca +12

We present weak lensing mass reconstructions for the 20 high-redshift clusters i n the ESO Distant Cluster Survey. The weak lensing analysis was performed on deep, 3-color optical…

astro-ph2005★ 111 cited

Halpha surface photometry of galaxies in nearby clusters. V: the survey completion

G. Gavazzi, A. Boselli, L. Cortese +4

We present the Halpha imaging observations of 273 late-type galaxies in the nearby rich galaxy clusters Virgo, A1367, Coma, Cancer, Hercules and in the Great Wall, carried out prim…

astro-ph2005★ 34 cited

Spectrophotometric properties of galaxies at intermediate redshifts (z ~ 0.2--1.0) II. The Luminosity -- Metallicity relation

Fabrice Lamareille, Thierry Contini, Jarle Brinchmann +3

We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts (). The sample selection, the spectroscopic observati…