INVESTIGADORES
O'MILL Ana Laura
artículos
Título:
Galaxy triplets in Sloan Digital Sky Survey Data Release 7 - III. Analysis of Configuration and Dynamics
Autor/es:
DUPLANCIC, FERNANDA; ALONSO, MARÍA SOL; GARCIA LAMBAS, DIEGO; O'MILL, ANA LAURA
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2014
ISSN:
0035-8711
Resumen:
We analyse the spatial configuration and the dynamical properties of a sample of 92 galaxy
triplets obtained from the SDSS-DR7 (SDSS-triplets) restricted to have members with spectroscopic
redshifts in the range 0.01 6 z 6 0.14 and absolute r-band luminosities brighter
than Mr = −20.5. The configuration analysis was performed through Agekyan & Anosova
map (AA-map). We estimated dynamical parameters, namely the radius of the system, the velocity
dispersion, a dimensionless crossing-time and the virial mass. We compared our results
with those obtained for a sample of triplets from the catalogue ?Isolated Triplets of Galaxies?
(K-triplets) and a sample of Compact Groups. We have also studied a mock catalogue
in order to compare real and projected configurations, and to estimate the three dimensional
dynamical parameters of the triple systems. We found that the SDSS-triplets prefer alignment
configurations while K-triplets present an uniform distribution in the AA-map. From the dynamical
analysis we conclude that the SDSS-triplets, K-triplets and Compact Groups present
a similar behaviour comprising compact systems with low crossing-time values, with velocity
dispersions and virial masses similar to those of low mass loose groups. Moreover, we found
that observed and simulated triplets present similar dynamical parameters. We also performed
an analysis of the dark matter content of galaxy triplets finding that member galaxies of mock
triplets belong to the same dark matter halo, showing a dynamical co-evolution of the system.
These results suggest that the configuration and dynamics of triple systems favour galaxy
interactions and mergers.