Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20543w&link_type=abstract
Spitzer Proposal ID #20543
Physics
Scientific paper
We propose to apply an infrared adaptation of the two-filter Cluster Red-Sequence (CRS) technique to detect a large (500-1000) sample of clusters at 1.0 < z < 1.8 in the 50 square degree SWIRE Legacy Survey. We hope to discover the elusive population of "young" clusters, the "missing-link" in the evolution of proto-clusters discovered at z > 2 to the mature population found at z < 1. In addition to providing a huge boost to cluster evolution studies, discovering this elusive population would also be crucial to our "big picture" of observational cosmology. For example, the evolution of the cluster mass function N(M, z) can place strong constraints on the equation of state of the mysterious dark energy. We have already applied the CRS technique successfully (albeit with a non-optimal filter combination) to the Spitzer First Look Survey and find it to be a very powerful and efficient new tool for detecting clusters of galaxies at high redshift. The CRS technique has the huge additional advantage, not only of detecting clusters in this redshift regime, but of providing very accurate redshifts for the clusters, based solely on the color of their passively evolving red sequence. We plan to release our final catalog as soon as possible. Such a catalog of homogeneously selected clusters in this unexplored redshift range would provide an invaluable resource to the cluster community and would undoubtedly result in numerous follow-up studies. Our Spitzer cluster catalog will also lay the groundwork for future Sunyaev-Zeldovich telescopes capable of detecting > 10,000 cluster candidates at z > 1 but which will require the clusters to be followed up using a CRS technique to determine a photometric redshift. This very unique project can currently only be achieved with the SWIRE dataset (area is vital because rich clusters are so rare). Our project will contribute to Spitzer's legacy by providing substantial returns to the entire cluster community at very little cost.
Gladders Mike
Hoekstra Henk
Lacy Mark
Muzzin Adam
Surace Jason
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