AKARI Observation of Early-Type Galaxies in Abell 2218

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the AKARI InfraRed Camera (IRC) imaging observation of nearby early-type galaxies in Abell 2218. It has been known that early-type galaxies show excess emission over the stellar light in MIR, which are attributed to the circumstellar dust around AGB stars and/or low level of star formation activity/AGNs. Especially, MIR emission of AGB stars has been suggested as a way to disentangle the age-metallicity degeneracy of early-type galaxy properties due to its sensitivity to age. However, tracing the MIR emission from AGB stars requires observations at the wavelength between 7 micron to 15 micron, and before AKARI, such an observation has been difficult with expensive spectroscopic observations using IRS on the Spitzer and with a small field-of-view of the ISO/Spitzer IRS 15 micron imager. We present the MIR SEDs, including the crucial 7 to 15 micron wavelength coverage, of 46 early-type galaxies imaged by the AKARI IRC, and discuss whether the MIR excess is related to the cluster environment of Abell 2218 which is known to be a merging cluster.

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