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Published 2007 | Published
Book Section - Chapter Open

Spitzer Observations of Galaxy Clusters


We present preliminary results of a project to study three rich nearby clusters of galaxies with the Spitzer space telescope. The Spitzer observations in the four IRAC and three MIPS bands cover a region up to three virial radii, approximately, and have been recently completed. On the basis of the first Spitzer images, we followed up spectroscopically the far-infrared sources with the multi-fiber spectrograph HYDRA on the WIYN telescope. 70% of the sources brighter than 0.3 mJy at 24 μm and r' < 20.5 have been observed for a total of 1078 spectra. For 87% of them we were able to measure redshifts obtaining 50 to 100 members for the different clusters. This first study shows that the far-IR sources in these clusters are predominantly powered by star formation and clustered in regions far from the center. In the case of A1763, they seem to be situated along a filament supporting the idea of infalling galaxies experiencing bursts of star formation during their first contact with the hot intra-cluster medium.

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© 2007 Astronomical Society of the Pacific.

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Published - Fadda2007p8638At_The_Edge_Of_The_Universe_Latest_Results_From_The_Deepest_Astronomical_Surveys.pdf



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August 19, 2023
January 13, 2024