Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-10
Mon.Not.Roy.Astron.Soc. 346 (2003) 1189
Astronomy and Astrophysics
Astrophysics
9 pages, 11 Postscript figures. Submitted to MNRAS. Revised version
Scientific paper
10.1111/j.1365-2966.2003.07179.x
We study galaxy pairs in the field selected from the 100 K public release of the 2dF galaxy redshift survey. Our analysis provides a well defined sample of 1258 galaxy pairs, a large database suitable for statistical studies of galaxy interactions in the local universe, $z \le 0.1$. Galaxy pairs where selected by radial velocity ($\Delta V$) and projected separation ($r_{\rm p}$) criteria determined by analyzing the star formation activity within neighbours (abridged). The ratio between the fractions of star forming galaxies in pairs and in isolation is a useful tools to unveil the effects of having a close companion. We found that about fifty percent of galaxy pairs do not show signs of important star formation activity (independently of their luminosities) supporting the hypothesis that the internal properties of the galaxies play a crucial role in the triggering of star formation by interactions.
Alonso Sol M.
Coldwell Georgina
Lambas Diego G.
Tissera Patricia Beatriz
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