Dynamical analysis of strong-lensing galaxy groups at intermediate redshift

Дата и время публикации : 2012-12-11T20:55:12Z

Авторы публикации и институты :
R. P. Muñoz (Departamento de Física y Astronomía, Universidad de Valparaíso, Chile, Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Chile)
V. Motta (Departamento de Física y Astronomía, Universidad de Valparaíso, Chile)
T. Verdugo (Departamento de Física y Astronomía, Universidad de Valparaíso, Chile, Centro de Investigaciones de Astronomía, Venezuela)
F. Garrido (Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Chile)
M. Limousin (Aix Marseille Université, LAM, France, Dark Cosmology Centre, Niels Bohr Institute, Denmark)
N. Padilla (Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Chile)
G. Foëx (Departamento de Física y Astronomía, Universidad de Valparaíso, Chile)
R. Cabanac (Laboratoire d’Astrophysique de Toulouse-Tarbes, Université de Toulouse, France)
R. Gavazzi (Institut d’Astrophysique de Paris, France)
L. F. Barrientos (Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Chile)
J. Richard (CRAL, Université Lyon 1, Observatoire de Lyon, France)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 20 pages, 5 figures in body, 7 figures in appendix, Submitted to Astronomy & Astrophysics Journal after revision
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: We present VLT spectroscopic observations of 7 discovered galaxy groups between 0.3<z<0.7. The groups were selected from the Strong Lensing Legacy Survey (SL2S), a survey that consists in a systematic search for strong lensing systems in the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We give details about the target selection, spectroscopic observations and data reduction for the first release of confirmed SL2S groups. The dynamical analysis of the systems reveals that they are gravitationally bound structures, with at least 4 confirmed members and velocity dispersions between 300 and 800 km/s. Their virial masses are between 10^13 and 10^14 M_sun, and so can be classified as groups or low mass clusters. Most of the systems are isolated groups, except two of them that show evidence of an ongoing merger of two sub-structures. We find a good agreement between the velocity dispersions estimated from the analysis of the kinematics of group galaxies and the weak lensing measurements, and conclude that the dynamics of baryonic matter is a good tracer of the total mass content in galaxy groups.

Category: Physics