911 citations · 3.7k across the 47 of their papers we have counts for
22 papers · 1 filter
Sigma-drop in galaxies and the sigma-metallicity degeneracy
Mina Koleva, Philippe Prugniel, Sven De Rijcke
In some galaxies, the central velocity dispersion, sigma, is depressed with respect to the surroundings. This sigma-drop phenomenon may have different physical origins, bearing inf…
Kinematics and Stellar Populations of Low-Luminosity Early-Type Galaxies in the Abell 496 Cluster
Igor Chilingarian, Veronique Cayatte, Florence Durret +5
The morphology and stellar populations of low-luminosity early-type galaxies in clusters have until now been limited to a few relatively nearby clusters such as Virgo or Fornax. Sc…
Low-Luminosity Early-Type Galaxies in the NGC 128 Group
Igor Chilingarian, Olga Sil'chenko, Victor Afanasiev +1
We present spatially resolved kinematics and stellar population parameters for three low-luminosity galaxies in the NGC128 group obtained by means of 3D spectroscopy. We briefly di…
Towards a Solution for the Ca II Triplet Puzzle : Results from Dwarf Elliptical Galaxies
Dolf Michielsen, Mina Koleva, Philippe Prugniel +6
We present new estimates of ages and metallicities, based on FORS/VLT optical (4400-5500A) spectroscopy, of 16 dwarf elliptical galaxies (dE's) in the Fornax Cluster and in Souther…
NBursts: Simultaneous Extraction of Internal Kinematics and Parametrized SFH from Integrated Light Spectra
Igor Chilingarian, Philippe Prugniel, Olga Sil'chenko +1
We present a novel approach for simultaneous extraction of stellar population parameters and internal kinematics from the spectra integrated along a line of sight. We fit a templat…
Age, metallicity and alpha-elements abundance in stellar population
M. Koleva, R. Gupta, Ph. Prugniel +1
We built modelled spectra of stellar population at high resolution and with variable alpha-elements enhancements. Analysing spectra of Galactic globular clusters we show that it is…
Analysis of stellar populations with large empirical libraries at high spectral resolution
Philippe Prugniel, Mina Koleva, Pierre Ocvirk +2
The stellar population models dramatically progressed with the arrival of large and complete libraries, ELODIE, CFLIB (=Indo-US) and MILES at a relatively high resolution. We show…
Comparison of different spectral population models
Mina Koleva, Philippe Prugniel, Pierre Ocvirk +3
We have compared simple stellar populations (SSPs) generated with different population synthesis tools: BC03, Vazdekis and Pegase.HR and different stellar libraries: ELODIE3.1, Ste…
New release of the ELODIE library: Version 3.1
Ph. Prugniel, C. Soubiran, M. Koleva +1
We present ELODIE.3.1, an updated release of the library published in Prugniel & Soubiran (2001, 2004). The library includes 1962 spectra of 1388 stars obtained with the ELODIE spe…
Age and metallicity of Galactic clusters from full spectrum fitting
Mina Koleva, Philippe Prugniel, Pierre Ocvirk +1
We are using full spectrum fitting to determine the ages and metallicities of Galactic clusters (M67 and globular clusters). We find that the method is very accurate to measure the…
Kinematics and stellar populations of the dwarf elliptical galaxy IC 3653
Igor Chilingarian, Philippe Prugniel, Olga Sil'chenko +1
We present the first 3D observations of a diffuse elliptical galaxy (dE). The good quality data (S/N up to 40) reveal the kinematical signature of an embedded stellar disc, reminis…
Globular clusters and dwarf galaxies in Fornax - I. Kinematics in the cluster core from multi-object spectroscopy
G. Bergond, E. Athanassoula, S. Leon +6
We acquired radial velocities of a significant number of globular clusters (GCs) on wide fields between galaxies in the nearby Fornax cluster of galaxies, in order to derive their…
Young Nuclei in Dwarf Elliptical Galaxies
Igor Chilingarian, Olga Sil'chenko, Victor Afanasiev +1
We report discovery of young embedded structures in three diffuse elliptical galaxies (dE) in the Virgo cluster: IC 783, IC 3468, and IC 3509. We performed 3D spectroscopic observa…
The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205
S. De Rijcke, P. Prugniel, F. Simien +1
We present three-integral dynamical models for the three Local Group dwarf elliptical galaxies: NGC147, NGC185, and NGC205. It is the first time models are constructed for the Loca…
Internal kinematics and stellar populations of dE galaxies: Clues to their formation/evolution
Philippe Prugniel, Igor Chilingarian, Olga Sil'chenko +1
What is the origin of the numerous population of diffuse elliptical galaxies (dE) in clusters? These galaxies formed their stars several billion years ago and lost their gas. Thoug…
Modelling and interpreting optical spectra of galaxies at R=10000
Ariane Lancon, Pierre Ocvirk, Damien Le Borgne +5
One way to extract more information from the integrated light of galaxies is to improve the spectral resolution at which observations and analysis are carried out. The population s…
Diffuse elliptical galaxies, the first 3D spectroscopic observations
Igor Chilingarian, Philippe Prugniel, Olga Silchenko +1
Diffuse elliptical galaxies (or dwarfs) are the numerically dominant population in clusters like Virgo and Fornax. They carry only a few percent of the baryonic mass but are very s…
Virtual instrumentation to study galaxies
Ph. Prugniel, I. Chilingarian, H. Flores +7
The MIGALE project (http://www.sai.msu.su/migale) provides databases and data analysis tools to study the evolution of galaxies from z=1 to z=0. It develops and maintain a general…
Kinematics of diffuse elliptical galaxies
Philippe Prugniel, Francois Simien
New observations show that most of the flattened diffuse elliptical (dE) galaxies are essentially isotropic rotators. This supports the idea that dEs have evolved from fast rotatin…
A database of high and medium-resolution stellar spectra
Philippe Prugniel, Caroline Soubiran
We present a database of 908 spectra of 709 stars obtained with the ELODIE spectrograph at Observatoire de Haute-Provence. 52 orders of the echelle spectra have been carefully fitt…
Hypercat : A Database for extragalactic astronomy
Ph. Prugniel, G. Maubon
The Hypercat Database is developed at Observatoire de Lyon and is distributed on the WEB through different mirrors in Europe. The goal of Hypercat is to gather data necessary for s…
Effect of the large scale environment on the internal dynamics of early-type galaxies
G. Maubon, Ph. Prugniel
We have studied the population-density relation in very sparse environments, from poor clusters to isolated galaxies, and we find that early-type galaxies with a young stellar popu…