Learn More
A simple model for the evolution of disc galaxies is presented. We adopt three numbers from observations of the Milky Way disc, Σ d the local surface mass density, r d the stellar scale length (of the assumedly exponential disc) and v c the amplitude of the (assumedly flat) rotation curve, and physically, the (local) dynamical Kennicutt star formation(More)
We describe high resolution Smoothed Particle Hydrodynamics (SPH) simulations of three approximately M * field galaxies starting from ΛCDM initial conditions. The simulations are made intentionally simple, and include photoionization, cooling of the intergalactic medium, and star formation but not feedback from AGN or supernovae. All of the galaxies undergo(More)
We present a set of global, self-consistent N-body/SPH simulations of the dynamic evolution of galactic discs with gas and including magnetic fields. We have implemented a description to follow the evolution of magnetic fields with the ideal induction equation in the SPH part of the Vine code. Results from a direct implementation of the field equations are(More)
We present H integral field spectroscopy of well-resolved, UV/optically selected z $ 2 star-forming galaxies as part of the SINS survey with SINFONI on the ESO VLT. Our laser guide star adaptive optics and good seeing data show the presence of turbulent rotating star-forming outer rings/disks, plus central bulge/inner disk components, whose mass fractions(More)
c 0000 RAS 2 Eric Emsellem et al. ABSTRACT We provide a census of the apparent stellar angular momentum within one effective radius of a volume-limited sample of 260 early-type galaxies (ETGs) in the nearby Universe, using integral-field spectroscopy obtained in the course of the ATLAS 3D project. We exploit the λ R parameter (previously used via a constant(More)
We study the thermal formation history of four simulated galaxies that were shown in Naab et al. (2007) to reproduce a number of observed properties of elliptical galaxies. The temperature of the gas in the galaxies is steadily increasing with decreasing redshift, although much of the gas has a cooling time shorter than the Hubble time. The gas is being(More)
In Paper I of this series we introduced a volume-limited parent sample of 871 galaxies from which we extracted the ATLAS 3D sample of 260 ETGs. In Paper II and III we classified the ETGs using their stellar kinematics, in a way that is nearly insensitive to the projection effects, and we separated them into fast and slow rotators. Here we look at galaxy(More)
We use the ATLAS 3D sample of 260 early-type galaxies to study the apparent kinematic mis-alignment angle, Ψ, defined as the angle between the photometric and kinematic major axis. We find that 71% of nearby early-type galaxies are strictly aligned systems (Ψ ≤ 5 •), an additional 14% have 5 • < Ψ ≤ 10 • and 90% of galaxies have Ψ ≤ 15 •. Taking into(More)
Stars form from cold molecular interstellar gas. As this is relatively rare in the local Universe, galaxies like the Milky Way form only a few new stars per year. Typical massive galaxies in the distant Universe formed stars an order of magnitude more rapidly. Unless star formation was significantly more efficient, this difference suggests that young(More)
Much of our knowledge of galaxies comes from analysing the radiation emitted by their stars, which depends on the present number of each type of star in the galaxy. The present number depends on the stellar initial mass function (IMF), which describes the distribution of stellar masses when the population formed, and knowledge of it is critical to almost(More)