CLASH : three strongly lensed images of a candidate z ≈ 11 galaxy

We present a candidate for the most distant galaxy known to date with a photometric redshift of z = 10.7(-0.4)(+0.6) (95% confidence limits; with z < 9.5 galaxies of known types ruled out at 7.2 sigma). This J-dropout Lyman break galaxy, named MACS0647-JD, was discovered as part of the Cluster Lensing and Supernova survey with Hubble (CLASH). We observe three magnified images of this galaxy due to strong gravitational lensing by the galaxy cluster MACSJ0647.7+7015 at z = 0.591. The images are magnified by factors of similar to 80, 7, and 2, with the brighter two observed at similar to 26th magnitude AB (similar to 0.15 mu Jy) in the WFC3/IR F160W filter (similar to 1.4-1.7 mu m) where they are detected at greater than or similar to 12 sigma. All three images are also confidently detected at greater than or similar to 6 sigma in F140W (similar to 1.2- 1.6 mu m), dropping out of detection from 15 lower wavelength Hubble Space Telescope filters (similar to 0.2-1.4 mu m), and lacking bright detections in Spitzer/IRAC 3.6 mu m and 4.5 mu m imaging (similar to 3.2-5.0 mu m). We rule out a broad range of possible lower redshift interlopers, including some previously published as high-redshift candidates. Our high-redshift conclusion is more conservative than if we had neglected a Bayesian photometric redshift prior. Given CLASH observations of 17 high-mass clusters to date, our discoveries of MACS0647-JD at z similar to 10.8 and MACS1149-JD at z similar to 9.6 are consistent with a lensed luminosity function extrapolated from lower redshifts. This would suggest that low-luminosity galaxies could have reionized the universe. However, given the significant uncertainties based on only two galaxies, we cannot yet rule out the sharp drop-off in number counts at z greater than or similar to 10 suggested by field searches