A new sample of bright galaxy pairs in UZC

Abstract

We present a new sample of bright galaxy pairs extracted applying an objective selection code to UZC catalog.The sample is volume limited to M${}_{zw}$ = -18.9 +5 log $h$ and contains 89 galaxy pairs.We analyze the kinematical, morphological and photometrical properties of galaxies belonging to this sample. We show that velocity separation, $|\Delta v_r|$, between pair members is significantly lower in spiral type (S+S) pairs than in early-type (E+E) and mixed (E+S) pairs.This indicates that truly isolated galaxy pairs are more likely to be found among S+S pairs. We show that ellipticals are rare and underluminous in B and that late spirals (T $\ge$ 4) are overluminous. We confirm that the formation of bright ellipticals is a phenomenon linked to group/cluster environment, while galaxy-galaxy interaction may enhance blue luminosity of disk galaxies through SF phenomena. This last statement is supported by the presence of strong FIR emission from early spirals in this sample and by the high frequency of AGN/SB phenomenon, revealed mainly in pairs of low relative radial velocity separation and showing signs of interaction.

arXiv commentA & A accepted, 6 pages, 6 figures

References in corpus (9)

• The Updated Zwicky Catalog (UZC)
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• On the dichotomy of Seyfert 2 galaxies: intrinsic differences and evolution
• The effect of the environment on the Faber Jackson relation
• Low-redshift quasars in the SDSS Stripe 82 II: associated companion galaxies and signature of star formation
• Clusters and Groups of Galaxies in the Simulated Local Universe
• The Environment of HII Galaxies revisited
• Nuclear activity in galaxy pairs: a spectroscopic analysis of 48 UZC-BGPs