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z~7-10 Galaxies behind Lensing Clusters: Contrast with Field Search Results
Rychard J. Bouwens, Garth D. Illingworth, Larry D. Bradley +6
We conduct a search for z>~7 dropout galaxies behind 11 massive lensing clusters using 21 arcmin**2 of deep HST NICMOS, ACS, and WFPC2 image data. In total, over this entire area,…
Discovery of a Very Bright Strongly-Lensed Galaxy Candidate at z ~ 7.6
L. D. Bradley, R. J. Bouwens, H. C. Ford +11
Using HST and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate at z~7.6 in the field of the massive galaxy cluster…
The Environment of M85 optical transient 2006-1: constraints on the progenitor age and mass
E. O. Ofek, S. R. Kulkarni, A. Rau +11
M85 optical transient 2006-1 (M85 OT 2006-1) is the most luminous member of the small family of V838 Mon-like objects, whose nature is still a mystery. This event took place in the…
Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024+17
M. J. Jee, H. C. Ford, G. D. Illingworth +13
We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z~0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing si…
Automated selection and characterization of emission-line sources in ACS WFC grism data
Gerhardt R. Meurer, Z. I. Tsvetanov, C. Gronwall +10
We present complimentary techniques to find emission-line targets and measure their properties in a semi-automated fashion from grism observations obtained with the Advanced Camera…
The Formation Epoch of Early-Type Galaxies in the z ~ 0.9 CL1604 Supercluster
N. L. Homeier, S. Mei, J. P. Blakeslee +12
We analyse the cluster color-magnitude relation (CMR) for early-type galaxies in two of the richer clusters in the z ~ 0.9 supercluster system to derive average ages and formation…