Spectral energy distributions for galaxies in high-redshift clusters – II. 0016 + 16 at z = 0.54

Galaxies at High Redshift

Galaxies at High Redshift

Within just the last few years, we have advanced from knowing only a few galaxies at z > 2 to having redshifts for nearly 1000 z ∼ 2–5 objects. The majority of this sample has been detected through the photometric “dropout” technique used so successfully by Steidel and his collaborators. In addition, a handful of objects have already been detected at z > 5, and we may already have a few objects...

The Density and Spectral Energy Distributions of Red Galaxies at Z ∼ 3.7

We use the deep NIR imaging of the FIRES survey to investigate trends with redshift of the properties of galaxies selected to have strong Balmer/4000 Å breaks at 2 < z < 4.5. Analagous to the J−K > 1.3 (AB) color criterion designed to select red galaxies at z > 2, we propose two color criteria, J−H > 0.9 and H−K > 0.9, to select red galaxies in two redshift bins at 2 < z < 3 and 3 < z < 4.5, re...

Lensed Galaxies at Redshift z ∼ 6 − 7 behind the Clusters Abell 1703 and CL 0024 + 16 1

We report on the discovery of three bright, strongly-lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 square arcminutes 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−...

Old Galaxies at High Redshift

The most passive galaxies at high redshift are unlikely to be identified by either narrow-band emission-line searches, or by Lyman limit searches (both techniques which have been highlighted at this meeting) simply because such selection methods rely on the presence of a strong ultraviolet component. Selection on the basis of extreme radio power has also proved to yield optically active objects...