NOAO >   Observing Info >   Approved Programs >   2014A-0306

Small NOAO Logo

Proposal Information for 2014A-0306


PI: Xinyu Dai, University of Oklahoma, xdai@ou.edu
Address: Physics Department, 440 West Brooks Street, Norman, OK 73019, USA

CoI: Rhiannon Griffin, University of Oklahoma
CoI: Chris S. Kochanek, Ohio State University
CoI: Joel N. Bregman, University of Michigan
CoI: Jenna Nugent, University of Oklahoma
CoI: Eduardo Rozo, Stanford University
CoI: Eli Rykoff, Stanford University

Title: Redshift Measurements of Galaxy Clusters from the Swift Serendipitous Cluster Survey

Abstract: The Swift-XRT observations of gamma-ray bursts form an excellent serendipitous, medium-deep, soft X-ray survey, covering a sky area of 100 square degrees with a median flux limit of 4\times10^-15\flux. The final survey will yield one of the largest uniformly selected X-ray cluster catalogs with ~1,200 clusters. Using SDSS, MDM 2.4m and KPNO 4m observations in the Northern hemisphere, we have confirmed 50% of the candidates as low redshift clusters (z < 0.5) and a fraction of the 0.5 < z < 0.8 clusters. Here, we propose to follow-up the Swift cluster candidates in the Southern hemisphere using the CTIO 4m telescope. In particular, we propose taking deep g/r/i/z images of ~140 Swift clusters using DECam to measure photometric redshifts up to z=1.0. This is important to constrain the completeness and purity of the catalog and to model the cluster selection function of the survey, so that the survey can be used to study structure evolution and cosmology. In addition, the sample will provide an important calibration data set for the DES cluster survey, allowing us to better calibrate and characterize the performance of the DES photometric cluster finders.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2014A-0306

noaoprop-help@noao.edu

Small NOAO Logo