The "Dilution Peak", Metallicity Evolution, and "Dating" Galaxy Interactions and Mergers (2010)
Montuori, M., Di Matteo, P., Lehnert, M. D., Combes, F., Semelin, B.
Observational evidence supported by numerical simulations suggests that strong inflows of gas from the outer disk to the inner kiloparsecs are induced during the interaction of disk galaxies. This...
Reionization by UV or X-ray sources (2010)
Baek, S., Semelin, B., Di Matteo, P., Revaz, Y., Combes, F.
We present simulations of the 21-cm signal during the Epoch of reionization. We focus on modeling properly the absorption regime in the presence of inhomogeneous Wouthuysen-Field effect and X-ray...
How ubiquitous are massive starbursts in interacting galaxies? (2009)
Di Matteo, P., Bournaud, F., Martig, M., Combes, F., Melchior, A. -L., Semelin, B.
Many evidences exist for a connection between galaxy interactions and induced star formation. However, a large range of responses of galaxies to tidal interactions is found, both in observations and...
Generation of rotationally dominated galaxies by mergers of pressure-supported progenitors (2009)
Di Matteo, P, Jog, CJ, Lehnert, MD, Combes, F, Semelin, B
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...
On the survival of metallicity gradients to major dry-mergers (2009)
Di Matteo, P., Pipino, A., Lehnert, M. D., Combes, F., Semelin, B.
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...
Di Matteo, P., Bournaud, F., Martig, M., Combes, F., Melchior, A. -L., Semelin, B.
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...
Baek, S., Di Matteo, P., Semelin, B., Combes, F., Revaz, Y.
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....
Di Matteo, P., Combes, F., Melchior, A. -L., Semelin, B.
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...
Old stellar counter-rotating components in early-type galaxies from elliptical-spiral mergers (2007)
Di Matteo, P., Combes, F., Melchior, A. -L., Semelin, B.
We investigate, by means of numerical simulations, the possibility of forming counter-rotating old stellar components by major mergers between an elliptical and a spiral galaxy. We show that...
Chemodynamical evolution of interacting galaxies: the GalMer view (2007)
Di Matteo, P., Combes, F., Chilingarian, I., Melchior, A. -L., Semelin, B.
We have undertaken a large set of simulations of galaxy interactions and mergers (GalMer Project) in order to study the physical processes related to galaxy encounters. All morphological types along...
Semelin, B., Combes, F., Baek, S.
During the epoch of reionization, Ly-alpha photons emitted by the first stars can couple the neutral hydrogen spin temperature to the kinetic gas temperature, providing the opportunity to observe the...
Star formation efficiency in galaxy interactions and mergers: a statistical study (2007)
Di Matteo, P., Combes, F., Melchior, A. -L., Semelin, B.
We investigate the enhancement of star formation efficiency in galaxy interactions and mergers, by numerical simulations of several hundred galaxy collisions. All morphological types along the Hubble...
The life-time of galactic bars: central mass concentrations and gravity torques (2005)
Bournaud, F., Combes, F., Semelin, B.
Bars in gas-rich spiral galaxies are short-lived. They drive gas inflows through their gravity torques, and at the same time self-regulate their strength. Their robustness has been subject of debate,...
New multi-zoom method for N-body simulations: application to galaxy growth by accretion (2005)
In this work we focus on the properties of accretion onto galaxies. Through numerical simulations we investigate the geometrical properties of accretion. To span the scale range required in these...
Formation and evolution of galactic disks with a multiphase numerical model (2002)
The formation and evolution of galactic disks are complex phenomena, where gas and star dynamics are coupled through star formation and the related feedback. The physical processes are so numerous...
Dynamical friction on cold fractal gas clouds,applications to disc formation (2002)
It is likely that cold molecular clouds form at high redshift, before galaxies. Considering these cold clouds instead of hot homogeneous gas as the main baryonic component of proto-galactic halos may...
N-body simulations of self-gravitating gas in stationary fragmented state (2000)
The interstellar medium is observed in a hierarchical fractal structure over several orders of magnitude in scale. Aiming to understand the origin of this structure, we carry out numerical...
Self-gravitating fluid dynamics, unstabilities and solitons (1999)
Semelin, B., Sanchez, N., De Vega, H. J.
This work studies the hydrodynamics of self-gravitating compressible isothermal fluids. We show that the hydrodynamic evolution equations in absence of viscosity are scale covariant. We study the...
Renormalization Group Flow and Fragmentation in the Self-Gravitating Thermal Gas (1998)
Semelin, B., De Vega, H. J., S'anchez, N., Combes, F.
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 phi(x) and exponential self-interaction. We...