597 citations · 11.5k across the 182 of their papers we have counts for
59 papers · 1 filter
Rings, spirals and manifolds
E. Athanassoula, M. Romero-Gomez, J. J. Masdemont
Two-armed, grand design spirals and inner and outer rings in barred galaxies can be due to orbits guided by the manifolds emanating from the vicinity of the L1 and L2 Lagrangian po…
Boxy/peanut bulges : formation, evolution and properties
E. Athanassoula, I. Martinez-Valpuesta
We discuss the formation and evolution of boxy/peanut bulges (B/Ps) and present new simulations results. Orbital structure studies show that B/Ps are parts of bars seen edge-on, th…
Topics on bar and bulge formation and evolution
E. Athanassoula
I discuss results from the COSMOS survey, showing that the fraction of disc galaxies that is barred decreases considerably with look-back time from z ~ 0.2 to z ~ 0.8. This decreas…
Boxy/peanut and discy bulges : formation, evolution and properties
E. Athanassoula
The class `bulges' contains objects with very different formation and evolution paths and very different properties. I review two types of `bulges', the boxy/peanut bulges (B/Ps) a…
Dynamical study of 2D and 3D barred galaxy models
T. Manos, E. Athanassoula
We study the dynamics of 2D and 3D barred galaxy analytical models, focusing on the distinction between regular and chaotic orbits with the help of the Smaller ALigment Index (SALI…
Gamma ray and Neutrino fluxes from a cosmological dark matter simulation
E. Athanassoula, F. -S. Ling, E. Nezri +1
In this paper, we estimate the gamma-ray and neutrino fluxes coming from dark matter annihilation in a Milky Way framework provided by a recent N-BODY HORIZON simulation. We first…
Boxy/Peanut bulges, vertical buckling and galactic bars
I. Martinez-Valpuesta, E. Athanassoula
Boxy/peanut bulges in disk galaxies have been associated to stellar bars. In this talk, we discuss the different properties of such bulges and their relation with the corresponding…
Formation and evolution of bulges
E. Athanassoula, I. Martinez-Valpuesta
After presenting three ways of defining a bulge component in disc galaxies, we introduce the various types of bulges, namely the classical bulges, the boxy/peanut bulges and the di…
A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model
E. Athanassoula
N-body simulations argue that the inner haloes of barred galaxies should not be spherical, nor even axisymmetric, but triaxial. The departure from sphericity is strongest near the…
Secular Evolution of Disc Galaxies and of their Components
E. Athanassoula
I discuss several aspects of secular evolution linked to bars and to boxy/peanut bulges, based on a very large number of high resolution, fully self-consistent -body simulations…
Star cluster disruption by giant molecular clouds
M. Gieles, S. F. Portegies Zwart, H. Baumgardt +4
We investigate encounters between giant molecular clouds (GMCs) and star clusters. We propose a single expression for the energy gain of a cluster due to an encounter with a GMC, v…
K-Band Observations of Boxy Bulges. I. Morphology and Surface Brightness Profiles
M. Bureau, G. Aronica, E. Athanassoula +3
Kn-band images, unsharp-masked images, as well as major-axis and vertically- summed surface brightness profiles are presented for 30 edge-on spiral galaxies, most with a boxy or pe…
Unveiling the Boxy Bulge and Bar of the Andromeda Spiral Galaxy
Rachael L. Beaton, Steven R. Majewski, Puragra Guhathakurta +6
A new, 2.8 deg^2 J,H,K_s infrared survey from the 2MASS 6x program across the extent of the optical disk of the Andromeda (M31) galaxy provides a clear view of the M31 center almos…
On the origin of rR_1 ring structures in barred galaxies
M. Romero-Gomez, J. J. Masdemont, E. Athanassoula +1
We propose a new theory for the formation of rR_1 ring structures, i.e. for ring structures with both an inner and an outer ring, the latter having the form of ``8''. We propose th…
Barred Galaxies:Studying the chaotic and ordered nature of orbits
T. Manos, E. Athanassoula
The chaotic or ordered character of orbits in galactic models is an important issue, since it can influence dynamical evolution. This distinction can be achieved with the help of t…
Detecting chaotic and ordered motion in barred galaxies
T. Manos, E. Athanassoula
A very important issue in the area of galactic dynamics is the detection of chaotic and ordered motion inside galaxies. In order to achieve this target, we use the Smaller ALignmen…
Chaos and the dynamical evolution of barred galaxies
T. Manos, E. Athanassoula
The dynamical evolution of barred galaxies depends crucially on the fraction and their spacial distribution of chaotic orbits in them. In order to distinguish between the two kinds…
Formation and dynamical evolution of galaxies and of their components
E. Athanassoula
From this vast subject, I will pick out and review three specific topics, namely the formation and evolution of bars, the formation of bulges, and the evolution during multiple maj…
Halo properties and secular evolution in barred galaxies
E. Athanassoula
The halo plays a crucial role in the evolution of barred galaxies. Its near-resonant material absorbs angular momentum emitted from some of the disc particles and helps the bar bec…
Interaction between a galactic disk and a live dark halo with an anisotropic velocity distribution
B. Fuchs, E. Athanassoula
We have extended previous analytical studies of the interaction of dark halos with galactic disks by introducing for the halo particles anisotropic distribution functions in phase…
Three-Dimensional Bar Structure and Disc/Bulge Secular Evolution
M. Bureau, G. Aronica, E. Athanassoula
Kn-band imaging of a sample of 30 edge-on spiral galaxies with a boxy or peanut-shaped (B/PS) bulge is discussed. Galaxies with a B/PS bulge tend to have a more complex morphology…
Can bars be destroyed by a central mass concentration? I. Simulations
E. Athanassoula, J. C. Lambert, W. Dehnen
We study the effect of a central mass concentration (CMC) on the secular evolution of a barred disc galaxy. Unlike previous studies, we use fully self-consistent 3D -body simula…
The large asymmetric HI envelope of the isolated galaxy NGC 864 (CIG 96)
D. Espada, A. Bosma, L. Verdes-Montenegro +4
We present a HI synthesis imaging study of NGC 864 (CIG 96), a spiral galaxy well isolated from similarly sized companions, yet presenting an intriguing asymmetry in its integral H…
On Bars, Haloes, their Interaction and their Orbital Structure
E. Athanassoula
A live halo plays an active role in the formation and evolution of bars by participating in the angular momentum redistribution which drives the dynamical evolution. Angular moment…