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The self-gravitating thermal gas (non-relativistic particles of mass m at temperature T ) is exactly equivalent to a field theory with a single scalar field φ(x) and exponential self-interaction. We build up perturbation theory around a space dependent stationary point φ0(r) in a finite size domain δ ≤ r ≤ R, (δ << R), which is relevant for astrophysical… (More)

We study through numerical simulation the spherical collapse of isothermal gas in Newtonian gravity. We observe a critical behavior which occurs at the threshold of gravitational instability leading to core formation. This was predicted in a previous work by two of the present authors. We describe it in detail in this work. For a given initial density… (More)

- Ilian T. Iliev, Daniel Whalen, +14 authors Masayuki Umemura
- 2009

The development of radiation hydrodynamical methods that are able to follow gas dynamics and radiative transfer (RT) self-consistently is key to the solution of many problems in numerical astrophysics. Such fluid flows are highly complex, rarely allowing even for approximate analytical solutions against which numerical codes can be tested. An alternative… (More)

- Benoit Semelin
- 2008

During the epoch of reionization, Ly-α photons emitted by the first stars can couple the neutral hydrogen spin temperature to the kinetic gas temperature, providing the opportunity to observe the gas in emission or absorption in the 21-cm line. Given the bright foregrounds, it is of prime importance to determine precisely the fluctuations signature of the… (More)

- P. Di Matteo, Chanda J. Jog, Matthew D. Lehnert, Françoise Combes, Benoit Semelin
- 2009

Through the analysis of a set of numerical simulations of major mergers between initially non-rotating, pressure supported progenitor galaxies with a range of central mass concentrations, we have shown that: (1) it is possible to generate elliptical-like galaxies, with v/σ > 1 outside one effective radius, as a result of the conversion of orbitalinto… (More)

- P. Di Matteo, Frédéric Bournaud, M . Martig, Françoise Combes, A . - L . Melchior, Benoit Semelin
- 2008

We investigate the intensity enhancement and the duration of starburst episodes, triggered by major galaxy interactions and mergers. To this aim, we analyze two large statistical datasets of numerical simulations. These have been obtained using two independent and different numerical techniques to model baryonic and dark matter evolution, that are… (More)

The 21 cm emission of neutral hydrogen is the most promising probe of the epoch of reionization (EoR). In the next few years, the SKA pathfinders will provide statistical measurements of this signal, such as its power spectrum. Within one decade, SKA should produce a full tomography of the signal. Numerical simulations predicting these observations are… (More)

The 21 cm emission of neutral hydrogen is the most promising probe of the epoch of reionization (EoR). In the next few years, the SKA pathfinders will provide statistical measurements of this signal such as its power spectrum. Within one decade, SKA should produce a full tomography of the signal. Numerical simulations predicting these observations are… (More)

We investigate, by means of numerical simulations, the kinematics of elliptical-spiral merger remnants. Counterrotation can appear both in coplanar and in non-coplanar retrograde mergers, and it is mostly associated to the presence of a disk component, which preserves part of its initial spin. In turn, the external regions of the two interacting galaxies… (More)

- P. Di Matteo, Antonio Pipino, Matthew D. Lehnert, Françoise Combes, Benoit Semelin
- 2009

Using a large suite of galaxies with a variety of concentrations and metallicity gradients, we study the evolution of non-dissipative (“dry”) equal mass mergers. Our purpose in generating these simulations is to explore how the metallicity gradient in dry mergers depends on the structure and metallicity gradients of the galaxies involved in the merger.… (More)