Hα Luminosity and Star Formation of Galaxies in Hickson Compact Groups

1999/04/07 by P. Severgnini, P. Saracco · 3 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Electrical and Electromagnetic Research #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1023/a:1017546907500

published as Astrophys.Space Sci. 276 (2001) 749-755 · 8 pages, 4 figures, proc. of the Euroconference on "The Evolution of Galaxies on Cosmological Timescale", to appear in Ap&SS

arxiv created 1999/04/07 · openalex publication_date 2001/03/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We have obtained H_α fluxes and luminosities for a sample of 95 accordant galaxies from observations of 31 Hickson Compact Groups (HCGs) in the North hemisphere. This sample is the largest H_α selected catalogue of galaxies having H_α calibrated fluxes so far. The results obtained from a preliminary analysis of a subsample of 66 galaxies show that the H_α luminosity of galaxies is correlated with velocity dispersion and compactness of groups. Such correlations would point toward a scenario in which H_α brightest 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.

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