PI: Ann Zabludoff, University of Arizona, firstname.lastname@example.org
Address: Steward Observatory, 933 N. Cherry Ave., Tucson, AZ 85721, USA
CoI: Yujin Yang, Max-Planck Institut fur Astronomie
CoI: Daniel Eisenstein, University of Arizona
CoI: Romeel Dave', University of Arizona
Title: Tracing the Cosmic Web with Lyman-(alpha) Blobs
Abstract: We have now completed an unprecedented blind survey for extended \lya nebulae, aka ``\lya blobs," at z ~ 2.3 in the Chandra Deep Field North (CDFN), South (CDFS), and Cosmic Evolution Survey (COSMOS) fields with a custom narrow-band filter and NOAO's 4m+MOSAIC cameras. These observations reveal that blobs are highly clustered - the six largest and brightest all lie in the CDFS. Our cosmological simulations suggest that these blobs occupy massive halos likely to evolve into rich clusters today, making them unique tracers of early structure formation. Comparison with our sample of lower mass, more compact \lya emitters further indicates that the CDFS blobs may occupy the intersections of large-scale filaments, which are in turn traced by the emitters. To test this picture, we propose to target the one other field in which we have discovered bright, clustered blobs: the NOAO Deep Wide Field Survey (NDWFS) field in Bootes. The proposed imaging (identical to that in the CDFS) will show whether the close pair of blobs identified in our initial shallow survey of this field occupy a similar overdensity. Once we have quantified the range of blob environments, comparison with simulations will better define the role of blobs in the formation of clusters and their massive galaxies. Our work on \lya blobs has been awarded long-term grants from NASA (4-year ADP) and the NSF (3-year Extragalactic).
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360