A new sample of bright galaxy pairs in UZC
Autor: | S. Marinoni, Paola Focardi, V. Zitelli, B. Kelm |
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Přispěvatelé: | Focardi P., Zitelli V., MArinoni S., Kelm B. |
Rok vydání: | 2006 |
Předmět: |
Physics
Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Type (model theory) Sample (graphics) Galaxy Luminosity Delta-v (physics) Radial velocity GALAXIES: GENERAL GALAXIES: INTERACTIONS Space and Planetary Science Cluster (physics) GALAXIES: FUNDAMENTAL PARAMETERS Astrophysics::Galaxy Astrophysics Spiral |
Zdroj: | Astronomy & Astrophysics. 456:467-472 |
ISSN: | 1432-0746 0004-6361 |
Popis: | 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 ${\it h}$ 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. Comment: A & A accepted, 6 pages, 6 figures |
Databáze: | OpenAIRE |
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