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We observed the brightest central galaxy (BCG) in the nearby (z=0.0821) coolcore galaxy cluster Abell 2597 with the IRAC and MIPS instruments on board theSpitzer Space Telescope. The BCG was clearly detected in all Spitzerbandpasses, including the 70 and 160 micron wavebands. We report aperturephotometry of the BCG. The spectral energy distribution exhibits a clear excessin the FIR over a Rayleigh-Jeans stellar tail, indicating a star formation rateof ~4-5 solar masses per year, consistent with the estimates from the UV andits H-alpha luminosity. This large FIR luminosity is consistent with that of astarburst or a Luminous Infrared Galaxy (LIRG), but together with a verymassive and old population of stars that dominate the energy output of thegalaxy. If the dust is at one temperature, the ratio of 70 to 160 micron fluxesindicate that the dust emitting mid-IR in this source is somewhat hotter thanthe dust emitting mid-IR in two BCGs at higher-redshift (z~0.2-0.3) and higherFIR luminosities observed earlier by Spitzer, in clusters Abell 1835 and Zwicky3146.

Infrared Emission from the Nearby Cool Core Cluster Abell 2597