A WISE View of a Nearby Supercluster A2199
Ho Seong Hwang (1), Margaret J. Geller (1), Antonaldo Diaferio (2,3),, Kenneth J. Rines (4) ((1) SAO, (2) Universita` di Torino, (3) INFN Torino,, (4) WWU)

TL;DR
This study uses WISE infrared data to analyze the properties and luminosity functions of galaxies in the A2199 supercluster, revealing environmental effects on galaxy types and MIR emission characteristics.
Contribution
It provides the first detailed MIR analysis of the A2199 supercluster, highlighting the environmental dependence of IR luminosity functions and galaxy populations.
Findings
MIR star-forming sequence identified among late-type galaxies.
Environmental dependence observed in the faint-end slope of 12 μm luminosity functions.
Early-type galaxies contribute more to the faint end in cluster cores.
Abstract
We use Wide-field Infrared Survey Explorer (WISE) data covering the entire region (~130 deg^2) of the A2199 supercluster at z=0.03 to study the mid-infrared (MIR) properties of supercluster galaxies. We identify a `MIR star-forming sequence' in the WISE [3.4]-[12] color-12 \mu m luminosity diagram, consisting of late-type, star-forming galaxies. At a fixed star formation rate (SFR), the MIR-detected galaxies at 22 \mu m or 12 \mu m tend to be more metal rich and to have higher surface brightness than those without MIR detection. Using these MIR-detected galaxies, we construct the IR luminosity function (LF) and investigate its environmental dependence. Both total IR (TIR) and 12 \mu m LFs are dominated by late-type, star-forming galaxies. The contribution of active galactic nuclei (AGN)-host galaxies increases with both TIR and 12 \mu m luminosities. The contribution of early-type…
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