A NEWFIRM Medium-Band Search for High Redshift Galaxy Clusters

Details A NEWFIRM Medium-Band Search for High Redshift Galaxy Clusters A NEWFIRM Medium-Band Search for High Redshift Galaxy Clusters

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933806t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #338.06

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained deep near-infrared imaging in the well-studied XMM-LSS field using the NEWFIRM instrument at CTIO to identify high redshift (z > 1.3) galaxy clusters. Our NEWFIRM pointing targets a single 30' x 30' field within the XMM-LSS where we have identified multiple candidate clusters as overdensities of sources with red Spitzer/IRAC colors from Papovich (2008). Our NEWFIRM imaging includes three medium-band (J1, J2, J3) and two broad-band (H, Ks) filters, and is 80% complete at 21.3 AB in Ks. Combined with existing CFHTLS optical imaging (ugriz), we achieve photometric redshifts accurate to a few percent, as these bands track the 4000 Angstrom/Balmer break through redshifts 1.3 < z < 2.0. Currently, our analysis of these data show three likely associations of galaxies from 1.3 < z < 2.0. We present properties of these three galaxy overdensities, including color-magnitude and color-radius relations, which support the idea that they are progenitors of present-day massive galaxy clusters.

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