BRIGHT STRONGLY LENSED GALAXIES AT REDSHIFT z∼ 6-7 BEHIND THE CLUSTERS ABELL 1703 AND CL0024+ 16 Academic Article uri icon

abstract

  • We report on the discovery of three bright, strongly lensed objects behind Abell 1703 and CL0024+ 16 from a dropout search over 25 arcmin 2 of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 Å and have clear detections in the J and H bands. Fits to the ACS, NICMOS, and IRAC data yield robust photometric redshifts in the range z~ 6-7 and largely rule out the possibility that they are low- redshift interlopers. All three objects are extended, and resolved into a pair of bright knots. The bright i-band dropout in Abell 1703 has an H-band AB magnitude of 23.9, which makes it one of the brightest known galaxy candidates at z> 5.5. Our model fits suggest a young, massive galaxy only~ 60 million years old with a mass of~ 10 10 M☉. The dropout galaxy candidates behind CL0024+ 16 are separated by 2 farcs 5 (~ 2 kpc in the source plane) …

publication date

  • May 15, 2009