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Type IA Supernova Explosion Models
- W. Hillebrandt, J. Niemeyer
- Physics
- 21 June 2000
▪ Abstract Because calibrated light curves of type Ia supernovae have become a major tool to determine the local expansion rate of the universe and also its geometrical structure, considerable atte...
Black hole formation in the early Universe
- M. Latif, D. Schleicher, W. Schmidt, J. Niemeyer
- Physics
- 3 April 2013
Supermassive black holes with up to a $\rm 10^{9}~M_{\odot}$ dwell in the centers of present-day galaxies, and their presence has been confirmed at z $\geq$ 6. Their formation at such early epochs is…
The characteristic black hole mass resulting from direct collapse in the early Universe
- M. Latif, D. Schleicher, W. Schmidt, J. Niemeyer
- Physics
- 4 September 2013
Black holes of a billion solar masses are observed in the infant universe a few hundred million years after the Big Bang. The direct collapse of protogalactic gas clouds in primordial halos with $\rm…
Numerical simulations of compressively driven interstellar turbulence. I. Isothermal gas
- W. Schmidt, C. Federrath, M. Hupp, Sebastian Kern, J. Niemeyer
- Physics
- 8 September 2008
Context. Supersonic turbulence is ubiquitous in the interstellar me dium and plays an important role in contemporary star formation. Aims. To perform a high-resolution numerical simulation of…
Dynamics of primordial black hole formation
- J. Niemeyer, K. Jedamzik
- Physics
- 21 January 1999
We present a numerical investigation of the gravitational collapse of horizon-size density fluctuations to primordial black holes (PBHs) during the radiation-dominated phase of the early Universe.…
The Thermonuclear Explosion of Chandrasekhar Mass White Dwarfs
- J. Niemeyer, S. Woosley
- Physics, Engineering
- 5 July 1996
The flame born in the deep interior of a white dwarf that becomes a Type Ia supernova is subject to several instabilities, the combination of which determines the observational characteristics of the…
A localised subgrid scale model for fluid dynamical simulations in astrophysics II: Application to
- W. Schmidt, J. Niemeyer, W. Hillebrandt, F. Roepke
- Physics, Environmental Science
- 23 January 2006
The dynamics of the explosive burning process is highly sensitive to the flame speed model in numerical simulations of type Ia supernovae. Based upon the hypothesis that the effective flame speed is…
Refined numerical models for multidimensional type Ia supernova simulations
- M. Reinecke, W. Hillebrandt, J. Niemeyer
- Physics
- 26 November 2001
Following up on earlier work on this topic (Reinecke et al. 1999b,a), we present an improved set of numerical models for simulations of white dwarfs exploding as type Ia supernovae (SNe Ia).…
High-resolution studies of massive primordial haloes
- M. Latif, D. Schleicher, W. Schmidt, J. Niemeyer
- Physics
- 5 October 2012
Atomic cooling haloes with virial temperatures Tvir ≥ 10 4 K are the most plausible sites for the formation of the first galaxies and the first intermediate mass black holes. It is therefore…
Near-Critical Gravitational Collapse and the Initial Mass Function of Primordial Black Holes
- J. Niemeyer, K. Jedamzik
- Physics
- 9 September 1997
The recent discovery of critical phenomena arising in gravitational collapse near the threshold of black-hole formation is used to estimate the initial mass function of primordial black holes (PBHs).…
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