Observaciones CCD de Grupos Compactos de Hickson

AGÜERO, M.; CAMPOS, M.; MAST, D.; TRUYOL, M.; VOLPE, G.; WEIDMANN, W.; DÍAZ, R.; CALDERÓN, J.

Boletin de la Asociacion Argentina de Astronomía

Asociacion Argentina de Astronomía

Año: 1998 vol. 42 p. 60 - 61

0571-3285

We inform the preliminary results of the morphological and kinematic study of the members of the Compact Group of Galaxies, Hickson 63. This study is based on images and spectra obtained in Bosque Alegre as a part of a long time program destinated to the analysis of this kind of objects. Our spectra improve the determination of the radial velocities, setting the distance of the group at 126 Mpc (h=0.75). One of the most important results is that the galaxy Hcg 63A do not belongs to the group and it is about half the distance to it. We al so obtained the internal radial velocity curves of the objects, that enabled us to estimate their masses. We determine the objects luminosity and relative colour index, the bluer galaxies are those with smaller apparent diameter. All the nuclei present emission lines, the most intense ones are those of the galaxy D nucleus, the more compact one and of earlier morphological type. The morphology and the radial velocity curves, both show traces of interaction between the objects, allowing us to establish that the galaxies Hcg 63 B, C y D are physically related and that they made up an isolated group.