Quantifying Photometric Redshift Errors in the Absence of Spectroscopic Redshifts (2009)
Quadri, Ryan F., Williams, Rik J.
Much of the science that is made possible by multiwavelength redshift surveys requires the use of photometric redshifts. But as these surveys become more ambitious, and as we seek to perform...
Williams, Rik J., Quadri, Ryan F., Franx, Marijn, Van Dokkum, Pieter, Toft, Sune, Kriek, Mariska, ...
The presence of massive, compact early-type galaxies at z>2 presents a major challenge for theoretical models of galaxy formation and evolution. Using one of the deepest large public near-IR surveys...
An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2 (2009)
Kriek, Mariska, Van Dokkum, Pieter G., Labbe, Ivo, Franx, Marijn, Illingworth, Garth D., Marchesini, Danilo, ...
Several recent studies have shown that about half of the massive galaxies at z~2 are in a quiescent phase. Moreover, these galaxies are commonly found to be ultra-compact with half-light radii of ~1...
Taylor, Edward N, Franx, Marijn, Van Dokkum, Pieter G, Quadri, Ryan F, Gawiser, Eric, Bell, Eric F, ...
We present a new K-selected, optical-to-near-infrared photometric catalog of the Extended Chandra Deep Field South (ECDFS), making it publicly available to the astronomical community. The dataset is...
A Confirmation of the Strong Clustering of Distant Red Galaxies at 2 < z (2008)
Quadri, Ryan F., Williams, Rik J., Lee, Kyoung-Soo, Franx, Marijn, Van Dokkum, Pieter, Brammer, Gabriel B.
Recent studies have shown that distant red galaxies (DRGs), which dominate the high-mass end of the galaxy population at z~2.5, are more strongly clustered than the population of blue star-forming...
Detection of quiescent galaxies in a bicolor sequence from z=0-2 (2008)
Williams, Rik J., Quadri, Ryan F., Franx, Marijn, Van Dokkum, Pieter, Labbe, Ivo
We investigate the properties of quiescent and star-forming galaxy populations to z~2 with purely photometric data, employing a novel rest-frame color selection technique. From the UKIDSS Ultra-Deep...