Hα Luminosity and Star Formation of Galaxies in Hickson Compact Groups |
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| Authors: | P Severgnini P Saracco |
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| Institution: | (1) IFC-CNR 'G. Occhialini', via Bassini 15, 20133 Milano, Italy;(2) Dip. Astronomico di Arcetri, Univ. Studi di Firenze, Firenze, Italy; E-mail;(3) Osservatorio Astronomico di Brera, via E. Bianchi 46, 22055 Merate, Italy |
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| Abstract: | We have obtained Hα fluxes and luminosities for a sample of 95 galaxies from observations of 31 Hickson Compact Groups (HCGs) in the northern
hemisphere. This sample is the largest Hα selected catalogue of galaxies having Hα calibrated fluxes so far. The results obtained from a preliminary analysis of a subsample of66 galaxies show that the Hα luminosity of the galaxies is correlated with velocity dispersion and compactness of groups. These correlations would point
towards a scenario in which the brightest Hα galaxies reside in compact groups having higher probability of galaxy interaction, i.e. lower values of velocity dispersion.
Moreover, such relations seem to depend on the environment in which HCGs themselves are embedded.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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