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19922026
Showing 2001Show all

163 papers · 1 filter

astro-ph2001★ 100 cited

The Impact of Cooling and Feedback on Disc Galaxies

Frank C. van den Bosch

We present detailed, analytical models for the formation of disc galaxies to investigate the impact that cooling and feedback have on their structural properties. In particular, we…

astro-ph2001★ 19 cited

The change from accretion via a thin disk to a coronal flow: dependence on the viscosity of the hot gas

E. Meyer-Hofmeister, F. Meyer

We study the transition from the geometrically thin disk to the hot coronal flow for accretion onto black holes. The efficiency of evaporation determines the truncation of the geom…

astro-ph2001★ 36 cited

The Structure and Evolution of Circumbinary Disks in Cataclysmic Variable Systems

G. Dubus, R. E. Taam, H. C. Spruit

We investigate the structure and evolution of a geometrically thin viscous Keplerian circumbinary (CB) disk, using detailed models of their radiative/convective vertical structure.…

astro-ph2001

Tracing the Remnants of Powerful Quasars to Probe the IGM

Torsten A. Ensslin, Rashid A. Sunyaev, Markus Brueggen

Powerful quasars and radio galaxies are injecting large amounts of energy in the form of radio plasma into the inter-galactic medium (IGM). Once this nonthermal component of the IG…

astro-ph2001★ 40 cited

Polarization of resonance X-ray lines from clusters of galaxies

S. Sazonov, E. Churazov, R. Sunyaev

As is known, resonant scattering can distort the surface-brightness profiles of clusters of galaxies in X-ray lines. We demonstrate that the scattered line emission should be polar…

astro-ph2001★ 106 cited

Early humps in WZ Sge stars

Yoji Osaki, Friedrich Meyer

Photometric humps in outburst that are locked with the binary orbital period have been observed exclusively in the early phase of outbursts of WZ Sge stars. It is suggested that th…

astro-ph2001★ 6 cited

From (p)reheating to nucleosynthesis

Karsten Jedamzik

This article gives a brief qualitative description of the possible evolution of the early Universe between the end of an inflationary epoch and the end of Big Bang nucleosynthesis.…

astro-ph2001★ 50 cited

Parameterised models for the lensing cluster Abell 1689

Lindsay King, Douglas Clowe, Peter Schneider

Here we apply a recently developed maximum likelihood method for determining best-fit parameterised lens models to observations of the rich lensing cluster Abell 1689. The observat…

astro-ph2001

Primordial Galaxy Formation and IGM Reionization

Benedetta Ciardi

In this talk I will present a model for primordial galaxy formation. In particular, I will review the feedback effects that regulate the process: (i) radiative (i.e. ionizing and H…

astro-ph2001★ 19 cited

Evolution and Explosion of Very Massive Primordial Stars

A. Heger, S. E. Woosley, I. Baraffe +1

While the modern stellar IMF shows a rapid decline with increasing mass, theoretical investigations suggest that very massive stars (>100 solar masses) may have been abundant in th…

astro-ph2001★ 7 cited

Chandra Observations of the Components of Clusters, Groups, and Galaxies and their Interactions

W. Forman, C. Jones, M. Markevitch +2

We discuss two themes from Chandra observations of galaxies, groups, and clusters. First, we review the merging process as seen through the high angular resolution of Chandra. We p…

astro-ph2001★ 221 cited

Acceleration of GRB outflows by Poynting flux dissipation

Georg Drenkhahn

We study magnetically powered relativistic outflows in which a part of the magnetic energy is dissipated internally by reconnection. For GRB parameters, and assuming that the recon…

astro-ph2001★ 11 cited

Predicting the clustering properties of galaxy clusters detectable for the Planck satellite

Lauro Moscardini, Matthias Bartelmann, Sabino Matarrese +1

We study the clustering properties of the galaxy clusters detectable for the Planck satellite due to their thermal Sunyaev-Zel'dovich effect. We take the past light-cone effect and…

astro-ph2001★ 243 cited

B-modes in cosmic shear from source redshift clustering

P. Schneider, L. van Waerbeke, Y. Mellier

Weak gravitational lensing by the large scale structure can be used to probe the dark matter distribution in the Universe directly and thus to probe cosmological models. The recent…

astro-ph2001★ 59 cited

Galaxy Formation in Preheated Intergalactic Media

H. J. Mo, S. Mao

We outline a scenario of galaxy formation in which the gas in galaxy-forming regions was preheated to high entropy by vigorous energy feedback associated with the formation of star…

astro-ph2001★ 123 cited

B1422+231: The influence of mass substructure on strong lensing

M. Bradac, P. Schneider, M. Steinmetz +3

In this work we investigate the gravitationally lensed system B1422+231. High--quality VLBI image positions, fluxes and shapes as well as an optical HST lens galaxy position are us…

astro-ph2001★ 58 cited

Lyman Continuum Escape from Inhomogeneous ISM

B. Ciardi, S. Bianchi, A. Ferrara

We have studied the effects of gas density inhomogeneities on the escape of ionising Lyman continuum (Lyc) photons from Milky Way-type galaxies via 3D numerical simulations using t…

gr-qc2001★ 50 cited

Simulating the dynamics of relativistic stars via a light-cone approach

Florian Siebel, Jose A. Font, Ewald Mueller +1

We present new numerical algorithms for the coupled Einstein-perfect fluid system in axisymmetry. Our framework uses a foliation based on a family of light cones, emanating from a…

astro-ph2001★ 22 cited

Varying speed of light cosmology from a stringy short distance cutoff

J. C. Niemeyer

It is shown that varying speed of light cosmology follows from a string-inspired minimal length uncertainty relation. Due to the reduction of the available phase space volume per q…

astro-ph2001★ 116 cited

Refined numerical models for multidimensional Type Ia supernova simulations

M. Reinecke, W. Hillebrandt, J. C. Niemeyer

Following up on earlier work on this topic (Reinecke et al. 1999, A&A 347, pp. 724 and 739), we present an improved set of numerical models for simulations of white dwarfs explodin…

astro-ph2001★ 15 cited

On the Explosion Mechanism of SNe Type Ia

M. Reinecke, J. C. Niemeyer, W. Hillebrandt

In this article we discuss the first simulations of two- and three-dimensional Type Ia supernovae with an improved hydrodynamics code. After describing the various enhancements, th…

astro-ph2001

Disks surrounding Cataclysmic Binaries

H. C. Spruit, R. E. Taam

Observations of Cataclysmic Variables show a number of phenomena that do not fit easily into the standard magnetic braking scenario. These include the large spread in mass transfer…

astro-ph2001★ 659 cited

Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages

I. Baraffe, G. Chabrier, F. Allard +1

We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses $m \le 1.4 \msol$ based on the Baraffe et al. (1998) input physics. We also extend the recent Chabri…

astro-ph2001★ 90 cited

Star Formation, Metallicity and Dust Properties Derived from the SAPM Galaxy Survey Spectra

S. Charlot, G. Kauffmann, M. Longhetti +4

We have derived star formation rates (SFRs), gas-phase oxygen abundances and effective dust absorption optical depths for a sample of galaxies drawn from the Stromlo-APM redshift s…