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Dynamical Evolution in Hickson Compact Groups using Intragroup Light

  • C. Da Rocha (a1) (a2), B. L. Ziegler (a1) and C. Mendes de Oliveira (a3)

Abstract

Most of the galaxies in the local universe are located in groups, in particular in small groups, and most of the transformations suffered by galaxies located in today's clusters are likely to have occurred in groups at higher redshifts. Understanding the formation and evolution of groups is essential to understand the whole picture of structures and galaxy build-up. Using multi-band photometry we studied the intragroup light component (IGL) observed in compact groups of galaxies in a subsample of Hickson's catalogue, an efficient tool for determining its stage of dynamical evolution and for mapping its gravitational potential. Applying the OV_WAV package, a wavelet based technique, we can identify the IGL independently of the main contaminating effects. The fractions of IGL detected range from 11% to 46%, with one group with no IGL detected. The colors are consistent with those for old stellar populations and the mean surface brightnesses range from 24.8 to 28.4 B mag arcsec−2. Using the IGL, along with other dynamical evolution indicators, we could establish an evolutionary sequence for our sample.

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Dynamical Evolution in Hickson Compact Groups using Intragroup Light

  • C. Da Rocha (a1) (a2), B. L. Ziegler (a1) and C. Mendes de Oliveira (a3)

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