Merging Galaxy Cluster Abell 2255 in Mid-Infrared

Details Merging Galaxy Cluster Abell 2255 in Mid-Infrared Merging Galaxy Cluster Abell 2255 in Mid-Infrared

2010-11-29

arxiv.org/abs/1011.6408v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

to appear in the Astrophysical Journal, January 1, 2011 issue

Scientific paper

We present the mid-infrared (MIR) observation of a nearby galaxy cluster, Abell 2255 by the AKARI space telescope. Using the AKARI's continuous wavelength coverage between 3-24 micron and the wide field of view, we investigate the properties of cluster member galaxies to see how the infall of the galaxies, the cluster substructures, and the cluster-cluster merger influence their evolution. We show that the excess of MIR (11 micron) flux is a good indicator to discriminate galaxies at different evolutionary stages, and divide galaxies into three classes accordingly : strong MIR-excess (N3-S11>0.2) galaxies that include both unobscured and obscured star-forming galaxies, weak MIR-excess (-2.05 Gyr) galaxies where the MIR emission arises mainly from the circumstellar dust around AGB stars, and intermediate MIR-excess (-1.2

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