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• W3100361080 endingPage "L202" @default.
• W3100361080 startingPage "L198" @default.
• W3100361080 abstract "We present the {it AKARI} InfraRed Camera (IRC) imaging observation of early-type galaxies in A2218 at z $simeq$ 0.175. Mid-infrared (MIR) emission from early-type galaxies traces circumstellar dust emission from AGB stars or/and residual star formation. Including the unique imaging capability at 11 and 15 $mu$m, our {it AKARI} data provide an effective way to investigate MIR properties of early-type galaxies in the cluster environment. Among our flux-limited sample of 22 red sequence early-type galaxies with precise dynamical and line strength measurements ($<$ 18 mag at 3 $mu m$), we find that at least 41% have MIR-excess emission. The $N3-S11$ versus $N3$ (3 and 11 $mu$m) color-magnitude relation shows the expected blue sequence, but the MIR-excess galaxies add a red wing to the relation especially at the fainter end. A SED analysis reveals that the dust emission from AGB stars is the most likely cause for the MIR-excess, with low level of star formation being the next possible explanation. The MIR-excess galaxies show a wide spread of $N3-S11$ colors, implying a significant spread (2--11 Gyr) in the estimated mean ages of stellar populations. We study the environmental dependence of MIR-excess early-type galaxies over an area out to a half virial radius ($sim$1 Mpc). We find that the MIR-excess early-type galaxies are preferentially located in the outer region. From these evidences, we suggest that the fainter, MIR-excess early-type galaxies have just joined the red sequence, possibly due to the infall and subsequent morphological/spectral transformation induced by the cluster environment." @default.
• W3100361080 created "2020-11-23" @default.
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• W3100361080 date "2009-04-03" @default.
• W3100361080 modified "2023-09-26" @default.
• W3100361080 title "THE MID-INFRARED VIEW OF RED SEQUENCE GALAXIES IN ABELL 2218 WITH <i>AKARI</i>" @default.
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• W3100361080 doi "https://doi.org/10.1088/0004-637x/695/2/l198" @default.
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