0 B 3 0003 + 387 : AGN Marked Large - Scale Structure at Redshift

We present evidence for a significant overdensity of red galaxies, as much as a factor of 14 over comparable field samples, in the field of the z = 1.47 radio galaxy B3 0003+387. The colors and luminosities of the brightest red galaxies are consistent with their being at z > 0.8. The radio galaxy and one of the red galaxies are separated by 5 and show some evidence of a possible interaction. However, the red galaxies do not show any strong clustering around the radio galaxy nor around any of the brighter red galaxies. The data suggest that we are looking at a wall or sheet of galaxies, possibly associated with the radio galaxy at z = 1.47. Spectroscopic redshifts of these red galaxies will be necessary to confirm this large-scale structure. Subject headings: galaxies: clusters: general — galaxies: distances and redshifts — large-scale structure of universe — infrared: galaxies This paper uses data obtained at the WIYN Observatory, a joint facility of the University of Wisconsin-Madison, Indiana University, Yale University, and the National Optical Astronomy Observatories. Based in part on observations obtained at the W. M. Keck Observatory.