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Spitzer-IRAC imaging of a Planck-selected Herschel-resolved candidate sub-mm galaxy proto-cluster at z = 3.25

Cooray, A., Eales, Stephen Anthony ORCID:, Dunne, L., Fu, H., Kim, S., Wardlow, J., Ivison, R., Clements, D., Rodighiero, G., van der Werf, P., Omont, A., de Zotti, G., Michalowski, M. and Bussmann, S. 2011. Spitzer-IRAC imaging of a Planck-selected Herschel-resolved candidate sub-mm galaxy proto-cluster at z = 3.25. Spitzer Proposal ID #80236

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Planck Early Release Compact Source Catalog (ERCSC) captures radio/sub-mm emission from Galactic cirrus structure to distant galaxy over densities. A joint study of Planck ERCSC and Herschel-SPIRE imaging overlapping in the GAMA survey fields of Herschel-ATLAS has led to the identification of one candidate proto-cluster of sub-millimeter galaxies. While ERCSC has this source detected with a flux of about 1 Jy, it is resolved into multiple sources in Herschel maps with an excess of about 20 submillimeter-bright galaxies over a region of 20 sq. arcmins. The brightest source of this clump is gravitationally lensed and its redshift of 3.259 is now well determined from multiple CO lines. Most of the nearby sub-mm galaxies within Planck beam have similar sub-mm colors, indicating a close redshift. It is likely that we have detected the first example of an over-density in the cosmic infrared background (CIB). Such overdensities are expected in the hierarchical structure formation models and are likely to lead to proto-clusters, regions that will eventually collapse to form galaxy clusters seen at z < 2. Here we propose deep IRAC imaging to identify the near-IR counterparts to the sub-mm sources and to identify an excess in the near-IR galaxy distribution, going to fainter galaxy fluxes that are expected below the Herschel-SPIRE confusion noise. The data will also be used to construct an over density map leading to a statistical study on the size, star-formation rate, gas consumption and other properties of this sub-mm galaxy proto-cluster. The IR AC imaging will be combined with planned optical and ground-based K-band imaging at Palomar to establish the photometric redshifts of galaxies in this region to separate foreground interlopers from the proto-cluster members and to reliably confirm the presence of a proto-cluster.

Item Type: Article
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Additional Information: Spitzer proposals - astronomers from across the world submit proposals to compete for time on NASA's Spitzer Space Telescope. Spitzer Proposal ID #80236
Last Modified: 20 Oct 2022 09:37

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