Spectres de NGC 1976, IC 4997, NGC 6572 et IC 418 dans le Proche Infrarouge Photographique

Dark matter in early – type galaxies : dynamical modelling of IC 1459 , IC 3370 , NGC 3379 and NGC 4105

We analyse long–slit spectra of four early–type galaxies which extend from ∼ 1 to ∼ 3 effective radii: IC 1459, IC 3370, NGC 3379 and NGC 4105. We have extracted the full line–of–sight velocity distribution (in the case of NGC 3379 we also used data from the literature) which we model using the two–integral approach. Using two–integral modelling we find no strong evidence for dark haloes, but t...

HRI observations of the Local Group galaxies IC 10 , NGC 147 and NGC 185

We report on pointed X-ray observations of IC 10, NGC 147 and NGC 185 made with the ROSAT High Resolution Imager (HRI). These are three Local Group galaxies that have never been previously studied in detail in the X-ray regime. IC 10 is the closest starburst galaxy to our own Galaxy, and NGC 147 and NGC 185 are companions to M31. We have discovered a variable X-ray source coincident with IC 10....

INTERVENTION SYMBOLIQUE DANS LE CHAMP SEMANTIQUE DE CERTAINES LOCUTIONS ET SON ROLE DANS LA FORMATION DECELLES-CI

Measuring supermassive black holes with gas kinematics - II . The LINERs IC 989 , NGC 5077 , and NGC 6500 ⋆

We present results from a kinematical study of the gas in the nucleus of a sample of three LINER galaxies, obtained from archival HST/STIS long-slit spectra. We found that, while for the elliptical galaxy NGC 5077, the observed velocity curves are consistent with gas in regular rotation around the galaxy’s center, this is not the case for the two remaining objects. By modeling the surface brigh...

Iron abundances from high - resolution spectroscopy of the open clusters NGC 2506 , NGC 6134 , and IC 4651 ⋆

This is the first of a series of papers devoted to derive the metallicity of old open clusters in order to study the time evolution of the chemical abundance gradient in the Galactic disk. We present detailed iron abundances from high resolution (R ∼ > 40, 000) spectra of several red clump and bright giant stars in the open clusters IC 4651, NGC 2506 and NGC 6134. We observed 4 stars of NGC 250...