Scientific Seminars

The DPOSS II survey of compact groups: first spectroscopically confirmed candidates and results.

Emanuela Pompei
Eso - Chile

2005-11-10    14:00    Brera -

We are currently carrying out a redshift survey of compact groups from the distant DPOSS II survey (Iovino et al. 2003, Carvalho et al. 2005), that extends to z ~ 0.2 in redshift the available surveys of compact groups of galaxies, mainly Hickson Compact Groups, (hereafter HCGs, Hickson, 1982); Southern Compact Groups, (herafter SCGs, Iovino, 2002). The goal of our survey is to confirm group membership via redshift information and to measure the characteristic parameters of a representative, sample of DPOSS survey groups. At this stage of the survey, with 18 groups analyzed and 60 more observed, we find that the median redshift of our confirmed groups so far is z ~ 0.12, to be compared with a median redshift of 0.03 for the local sample of compact groups by Hickson.