597 citations · 11.5k across the 182 of their papers we have counts for
17 papers · 1 filter
ARGOS II: The Galactic Bulge Survey
K. Freeman, M. Ness, E. Wylie de Boer +8
We describe the motivation, field locations and stellar selection for the ARGOS spectroscopic survey of 28,000 stars in the bulge and inner disk of the Milky Way galaxy across lati…
ARGOS III: Stellar Populations in the Galactic Bulge of the Milky Way
M. Ness, K. Freeman, E. Athanassoula +7
We present the metallicity results from the ARGOS spectroscopic survey of the Galactic bulge. Our aim is to understand the formation of the Galactic bulge: did it form via mergers,…
Bar formation and evolution in disc galaxies with gas and a triaxial halo: Morphology, bar strength and halo properties
E. Athanassoula, R. E. G. Machado, S. A. Rodionov
We follow the formation and evolution of bars in N-body simulations of disc galaxies with gas and/or a triaxial halo. We find that both the relative gas fraction and the halo shape…
Bars and secular evolution in disk galaxies: Theoretical input
E. Athanassoula
Bars play a major role in driving the evolution of disk galaxies and in shaping their present properties. They cause angular momentum to be redistributed within the galaxy, emitted…
Breaks in thin and thick discs of edge-on galaxies imaged in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
Sébastien Comerón, Bruce G. Elmegreen, Heikki Salo +17
Breaks in the radial luminosity profiles of galaxies have been until now mostly studied averaged over discs. Here we study separately breaks in thin and thick discs in 70 edge-on g…
HI asymmetry in the isolated galaxy CIG 85 (UGC 1547)
C. Sengupta, T. C. Scott, L. Verdes Montenegro +10
We present the results from the Giant Metrewave Radio Telescope (GMRT) interferometric HI and 20 cm radio continuum observations of CIG 85, an isolated asymmetric galaxy from the A…
Hot Disks And Delayed Bar Formation
Kartik Sheth, Jason Melbourne, Debra Meloy Elmegreen +4
We present observational evidence for the inhibition of bar formation in dispersion-dominated (dynamically hot) galaxies by studying the relationship between galactic structure and…
A unified picture of breaks and truncations in spiral galaxies from SDSS and S^{4}G imaging
Ignacio Martín-Navarro, Judit Bakos, Ignacio Trujillo +21
The mechanism causing breaks in the radial surface brightness distribution of spiral galaxies is not yet well known. Despite theoretical efforts, there is not a unique explanation…
Hα Kinematics of S4G spiral galaxies-I. NGC 864
Santiago Erroz-Ferrer, Johan H. Knapen, Joan Font +22
We present a study of the kinematics of the isolated spiral galaxy NGC 864, using Hα Fabry-Perot data obtained with the GHαFaS instrument at the William Herschel Telescope in La Pa…
Manifold-driven spirals in N-body barred galaxy simulations
E. Athanassoula
We discuss the properties of spiral arms in a N-body simulation of a barred galaxy and present evidence that these are manifold-driven. The strongest evidence comes from following…
Simulations of Barred Galaxies in Triaxial Dark Matter Haloes: The Effects of Gas
Rubens E. G. Machado, E. Athanassoula, S. A. Rodionov
The baryonic discs of galaxies are believed to alter the shapes of the dark matter haloes in which they reside. We perform a set of hydrodynamical N-body simulations of disc galaxi…
The origin of the split red clump in the Galactic bulge of the Milky Way
M. Ness, K. Freeman, E. Athanassoula +8
Near the minor axis of the Galactic bulge, at latitudes b < -5 degrees, the red giant clump stars are split into two components along the line of sight. We investigate this split u…
Bars in hydrodynamical cosmological simulations
Cecilia Scannapieco, Evangelia Athanassoula
We study the properties of two bars formed in fully cosmological hydrodynamical simulations of the formation of Milky Way-mass galaxies. In one case, the bar formed in a system wit…
Galaxy disks do not need to survive in the L-CDM paradigm: the galaxy merger rate out to z~1.5 from morpho-kinematic data
M. Puech, F. Hammer, P. F. Hopkins +5
About two-thirds of present-day, large galaxies are spirals such as the Milky Way or Andromeda, but the way their thin rotating disks formed remains uncertain. Observations have re…
Early type galaxies with tidal debris and their scaling relations in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
Taehyun Kim, Kartik Sheth, Joannah L. Hinz +21
Tidal debris around galaxies can yield important clues on their evolution. We have identified tidal debris in 11 early type galaxies (T \leq 0) from a sample of 65 early types draw…
The S4G perspective on circumstellar dust extinction of AGB stars in M100
Sharon E. Meidt, Eva Schinnerer, Juan-Carlos Munoz-Mateos +19
We examine the effect of circumstellar dust extinction on the near-IR contribution of asymptotic giant branch (AGB) stars in intermediate-age clusters throughout the disk of M100.…
Loops formed by tidal tails as fossil records of a major merger
J. Wang, F. Hammer, E. Athanassoula +3
Many haloes of nearby disc galaxies contain faint and extended features, including loops, which are often interpreted as relics of satellite infall in the main galaxy's potential w…